Extensions for Using Data Elements from FHIR R4B in FHIR STU3
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Extensions for Using Data Elements from FHIR R4B in FHIR STU3 - Downloaded Version null See the Directory of published versions

Resource Profile: Profile_R4B_CodeSystem_R3 - Detailed Descriptions

Page standards status: Trial-use Maturity Level: 0

Definitions for the profile-CodeSystem resource profile.

Guidance on how to interpret the contents of this table can be foundhere

0. CodeSystem
Definition

A code system resource specifies a set of codes drawn from one or more code systems.

ShortA set of codes drawn from one or more code systems
Control0..*
Invariantsdom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty())
dom-1: If the resource is contained in another resource, it SHALL NOT contain any narrative (contained.text.empty())
dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty())
dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource (contained.where(('#'+id in %resource.descendants().reference).not()).empty())
csd-1: Within a code system definition, all the codes SHALL be unique ((concept.code | descendants().concept.code).isDistinct())
dom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty())
dom-1: If the resource is contained in another resource, it SHALL NOT contain any narrative (contained.text.empty())
dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty())
dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource (contained.where(('#'+id in %resource.descendants().reference).not()).empty())
csd-1: Within a code system definition, all the codes SHALL be unique ((concept.code | descendants().concept.code).isDistinct())
2. CodeSystem.implicitRules
Definition

A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content.

ShortA set of rules under which this content was created
Comments

Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element.

This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation.

Control0..1
Typeuri
Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
4. CodeSystem.extension
Definition

An Extension


May be used to represent additional information that is not part of the basic definition of the resource. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

ShortExtensionAdditional Content defined by implementations
Comments

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

Control0..*
TypeExtension
Alternate Namesextensions, user content
SlicingThis element introduces a set of slices on CodeSystem.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
  • value @ url
  • 6. CodeSystem.extension:supplements
    Slice Namesupplements
    Definition

    R4B: CodeSystem.supplements (new:canonical(CodeSystem))

    ShortR4B: Canonical URL of Code System this adds designations and properties to (new)
    Comments

    Element CodeSystem.supplements has a context of CodeSystem based on following the parent source element upwards and mapping to CodeSystem. Element CodeSystem.supplements has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element). The most common use of a code system supplement is to add additional language support.

    Control0..1
    This element is affected by the following invariants: ele-1
    TypeExtension(R4B: Canonical URL of Code System this adds designations and properties to (new)) (Extension Type: uri(Cross-version Profile for R4B.CodeSystem for use in FHIR STU3, CodeSystem))
    Is Modifierfalse
    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
    8. CodeSystem.modifierExtension
    Definition

    May be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

    ShortExtensions that cannot be ignored
    Comments

    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

    Control0..*
    TypeExtension
    Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
    Alternate Namesextensions, user content
    10. CodeSystem.status
    Definition

    The status of this code system. Enables tracking the life-cycle of the content.

    Shortdraft | active | retired | unknown
    Comments

    Allows filtering of code systems that are appropriate for use vs. not.
    This is labeled as "Is Modifier" because applications should not use a retired code system without due consideration.

    Control1..1
    BindingThe codes SHALL be taken from PublicationStatushttp://hl7.org/fhir/ValueSet/publication-status|3.0.2
    (required to http://hl7.org/fhir/ValueSet/publication-status|3.0.2)

    The lifecycle status of a Value Set or Concept Map.

    Typecode
    Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
    Summarytrue
    12. CodeSystem.experimental
    Definition

    A boolean value to indicate that this code system is authored for testing purposes (or education/evaluation/marketing), and is not intended to be used for genuine usage.

    ShortFor testing purposes, not real usage
    Comments

    Allows filtering of code system that are appropriate for use vs. not. This is labeled as "Is Modifier" because applications should not use an experimental code system in production.

    Control0..1
    Typeboolean
    Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
    Summarytrue
    Requirements

    Enables experimental content to be developed following the same lifecycle that would be used for a production-level code system.

    14. CodeSystem.content
    Definition

    How much of the content of the code system - the concepts and codes it defines - are represented in this resource.

    Shortnot-present | example | fragment | complete
    Control1..1
    BindingThe codes SHALL be taken from CodeSystemContentModehttp://hl7.org/fhir/ValueSet/codesystem-content-mode|3.0.2
    (required to http://hl7.org/fhir/ValueSet/codesystem-content-mode|3.0.2)

    How much of the content of the code system - the concepts and codes it defines - are represented in a code system resource

    Typecode
    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
    Summarytrue
    16. CodeSystem.content.extension
    Definition

    An Extension


    May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

    ShortExtensionAdditional Content defined by implementations
    Comments

    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

    Control0..*
    TypeExtension
    Alternate Namesextensions, user content
    SlicingThis element introduces a set of slices on CodeSystem.content.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
    • value @ url
    • 18. CodeSystem.content.extension:content
      Slice Namecontent
      Definition

      R4B: CodeSystem.content

      ShortR4B: not-present | example | fragment | complete | supplement
      Comments

      Element CodeSystem.content is mapped to FHIR STU3 element CodeSystem.content as SourceIsBroaderThanTarget.

      Control0..1
      This element is affected by the following invariants: ele-1
      TypeExtension(R4B: not-present | example | fragment | complete | supplement) (Extension Type: code)
      Is Modifierfalse
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())

      Guidance on how to interpret the contents of this table can be foundhere

      0. CodeSystem
      2. CodeSystem.meta
      4. CodeSystem.meta.extension
      Control0..*
      SlicingThis element introduces a set of slices on CodeSystem.meta.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
      • value @ url
      • 6. CodeSystem.meta.extension:meta
        Slice Namemeta
        Definition

        R4B: CodeSystem.meta additional types (Meta) additional types from child elements (lastUpdated, profile, security, source, tag, versionId)

        ShortR4B: meta additional types
        Comments

        Element CodeSystem.meta is mapped to FHIR STU3 element CodeSystem.meta as SourceIsBroaderThanTarget. The mappings for CodeSystem.meta do not cover the following types: Meta. The mappings for CodeSystem.meta do not cover the following types based on type expansion: lastUpdated, profile, security, source, tag, versionId.

        Control0..1
        TypeExtension(R4B: meta additional types) (Extension Type: Meta)
        8. CodeSystem.text
        10. CodeSystem.text.extension
        Control0..*
        SlicingThis element introduces a set of slices on CodeSystem.text.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
        • value @ url
        • 12. CodeSystem.text.extension:text
          Slice Nametext
          Definition

          R4B: CodeSystem.text additional types (Narrative) additional types from child elements (div, status)

          ShortR4B: text additional types
          Comments

          Element CodeSystem.text is mapped to FHIR STU3 element CodeSystem.text as SourceIsBroaderThanTarget. The mappings for CodeSystem.text do not cover the following types: Narrative. The mappings for CodeSystem.text do not cover the following types based on type expansion: div, status. Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded information is added later.

          Control0..1
          TypeExtension(R4B: text additional types) (Complex Extension)
          14. CodeSystem.extension
          Control0..*
          SlicingThis element introduces a set of slices on CodeSystem.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
          • value @ url
          • 16. CodeSystem.extension:supplements
            Slice Namesupplements
            Definition

            R4B: CodeSystem.supplements (new:canonical(CodeSystem))

            ShortR4B: Canonical URL of Code System this adds designations and properties to (new)
            Comments

            Element CodeSystem.supplements has a context of CodeSystem based on following the parent source element upwards and mapping to CodeSystem. Element CodeSystem.supplements has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element). The most common use of a code system supplement is to add additional language support.

            Control0..1
            TypeExtension(R4B: Canonical URL of Code System this adds designations and properties to (new)) (Extension Type: uri(Cross-version Profile for R4B.CodeSystem for use in FHIR STU3, CodeSystem))
            18. CodeSystem.identifier
            NoteThis is a business identifier, not a resource identifier (see discussion)
            20. CodeSystem.identifier.extension
            Control0..*
            SlicingThis element introduces a set of slices on CodeSystem.identifier.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
            • value @ url
            • 22. CodeSystem.identifier.extension:identifier
              Slice Nameidentifier
              Definition

              R4B: CodeSystem.identifier additional types (Identifier) additional types from child elements (assigner, period, system, type, use, value)

              ShortR4B: Additional identifier for the code system (business identifier) additional types
              Comments

              Element CodeSystem.identifier is mapped to FHIR STU3 element CodeSystem.identifier as SourceIsBroaderThanTarget. The mappings for CodeSystem.identifier do not cover the following types: Identifier. The mappings for CodeSystem.identifier do not cover the following types based on type expansion: assigner, period, system, type, use, value. Typically, this is used for identifiers that can go in an HL7 V3 II (instance identifier) data type, and can then identify this code system outside of FHIR, where it is not possible to use the logical URI. Note that HL7 defines at least three identifiers for many of its code systems - the FHIR canonical URL, the OID and the V2 Table 0396 mnemonic code.

              Control0..*
              TypeExtension(R4B: Additional identifier for the code system (business identifier) additional types) (Extension Type: Identifier)
              24. CodeSystem.contact
              26. CodeSystem.contact.extension
              Control0..*
              SlicingThis element introduces a set of slices on CodeSystem.contact.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
              • value @ url
              • 28. CodeSystem.contact.extension:contact
                Slice Namecontact
                Definition

                R4B: CodeSystem.contact additional types (ContactDetail) additional types from child elements (name, telecom)

                ShortR4B: contact additional types
                Comments

                Element CodeSystem.contact is mapped to FHIR STU3 element CodeSystem.contact as SourceIsBroaderThanTarget. The mappings for CodeSystem.contact do not cover the following types: ContactDetail. The mappings for CodeSystem.contact do not cover the following types based on type expansion: name, telecom. May be a web site, an email address, a telephone number, etc.

                Control0..*
                TypeExtension(R4B: contact additional types) (Complex Extension)
                30. CodeSystem.useContext
                32. CodeSystem.useContext.extension
                Control0..*
                SlicingThis element introduces a set of slices on CodeSystem.useContext.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                • value @ url
                • 34. CodeSystem.useContext.extension:useContext
                  Slice NameuseContext
                  Definition

                  R4B: CodeSystem.useContext additional types (UsageContext) additional types from child elements (code, value[x])

                  ShortR4B: The context that the content is intended to support additional types
                  Comments

                  Element CodeSystem.useContext is mapped to FHIR STU3 element CodeSystem.useContext as SourceIsBroaderThanTarget. The mappings for CodeSystem.useContext do not cover the following types: UsageContext. The mappings for CodeSystem.useContext do not cover the following types based on type expansion: code, value[x]. When multiple useContexts are specified, there is no expectation that all or any of the contexts apply.

                  Control0..*
                  TypeExtension(R4B: The context that the content is intended to support additional types) (Complex Extension)
                  36. CodeSystem.content
                  38. CodeSystem.content.extension
                  Control0..*
                  SlicingThis element introduces a set of slices on CodeSystem.content.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                  • value @ url
                  • 40. CodeSystem.content.extension:content
                    Slice Namecontent
                    Definition

                    R4B: CodeSystem.content

                    ShortR4B: not-present | example | fragment | complete | supplement
                    Comments

                    Element CodeSystem.content is mapped to FHIR STU3 element CodeSystem.content as SourceIsBroaderThanTarget.

                    Control0..1
                    TypeExtension(R4B: not-present | example | fragment | complete | supplement) (Extension Type: code)
                    42. CodeSystem.property
                    44. CodeSystem.property.type
                    46. CodeSystem.property.type.extension
                    Control0..*
                    SlicingThis element introduces a set of slices on CodeSystem.property.type.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                    • value @ url
                    • 48. CodeSystem.property.type.extension:type
                      Slice Nametype
                      Definition

                      R4B: CodeSystem.property.type

                      ShortR4B: code | Coding | string | integer | boolean | dateTime | decimal
                      Comments

                      Element CodeSystem.property.type is mapped to FHIR STU3 element CodeSystem.property.type as SourceIsBroaderThanTarget.

                      Control0..1
                      TypeExtension(R4B: code | Coding | string | integer | boolean | dateTime | decimal) (Extension Type: code)
                      50. CodeSystem.concept
                      52. CodeSystem.concept.property
                      54. CodeSystem.concept.property.extension
                      Control0..*
                      SlicingThis element introduces a set of slices on CodeSystem.concept.property.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                      • value @ url
                      • 56. CodeSystem.concept.property.extension:value
                        Slice Namevalue
                        Definition

                        R4B: CodeSystem.concept.property.value[x] additional types (decimal)

                        ShortR4B: value additional types
                        Comments

                        Element CodeSystem.concept.property.value[x] is mapped to FHIR STU3 element CodeSystem.concept.property.value[x] as SourceIsBroaderThanTarget. The mappings for CodeSystem.concept.property.value[x] do not cover the following types: decimal. The target context CodeSystem.concept.property.value[x] is a choice-type element and cannot directly hold extensions. The context is moved up to parent element CodeSystem.concept.property.

                        Control0..1
                        TypeExtension(R4B: value additional types) (Extension Type: decimal)

                        Guidance on how to interpret the contents of this table can be foundhere

                        0. CodeSystem
                        Definition

                        A code system resource specifies a set of codes drawn from one or more code systems.

                        ShortA set of codes drawn from one or more code systems
                        Control0..*
                        Invariantsdom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty())
                        dom-1: If the resource is contained in another resource, it SHALL NOT contain any narrative (contained.text.empty())
                        dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty())
                        dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource (contained.where(('#'+id in %resource.descendants().reference).not()).empty())
                        csd-1: Within a code system definition, all the codes SHALL be unique ((concept.code | descendants().concept.code).isDistinct())
                        2. CodeSystem.id
                        Definition

                        The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.

                        ShortLogical id of this artifact
                        Comments

                        The only time that a resource does not have an id is when it is being submitted to the server using a create operation.

                        Control0..1
                        Typeid
                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                        Summarytrue
                        4. CodeSystem.meta
                        Definition

                        The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content may not always be associated with version changes to the resource.

                        ShortMetadata about the resource
                        Control0..1
                        TypeMeta
                        Summarytrue
                        6. CodeSystem.meta.id
                        Definition

                        unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                        Shortxml:id (or equivalent in JSON)
                        Control0..1
                        Typestring
                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                        XML FormatIn the XML format, this property is represented as an attribute.
                        8. CodeSystem.meta.extension
                        Definition

                        An Extension

                        ShortExtension
                        Control0..*
                        TypeExtension
                        SlicingThis element introduces a set of slices on CodeSystem.meta.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                        • value @ url
                        • 10. CodeSystem.meta.extension:meta
                          Slice Namemeta
                          Definition

                          R4B: CodeSystem.meta additional types (Meta) additional types from child elements (lastUpdated, profile, security, source, tag, versionId)

                          ShortR4B: meta additional types
                          Comments

                          Element CodeSystem.meta is mapped to FHIR STU3 element CodeSystem.meta as SourceIsBroaderThanTarget. The mappings for CodeSystem.meta do not cover the following types: Meta. The mappings for CodeSystem.meta do not cover the following types based on type expansion: lastUpdated, profile, security, source, tag, versionId.

                          Control0..1
                          TypeExtension(R4B: meta additional types) (Extension Type: Meta)
                          12. CodeSystem.meta.versionId
                          Definition

                          The version specific identifier, as it appears in the version portion of the URL. This values changes when the resource is created, updated, or deleted.

                          ShortVersion specific identifier
                          Comments

                          The server assigns this value, and ignores what the client specifies, except in the case that the server is imposing version integrity on updates/deletes.

                          Control0..1
                          Typeid
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          Summarytrue
                          14. CodeSystem.meta.lastUpdated
                          Definition

                          When the resource last changed - e.g. when the version changed.

                          ShortWhen the resource version last changed
                          Comments

                          This value is always populated except when the resource is first being created. The server / resource manager sets this value; what a client provides is irrelevant.

                          Control0..1
                          Typeinstant
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          Summarytrue
                          16. CodeSystem.meta.profile
                          Definition

                          A list of profiles (references to StructureDefinition resources) that this resource claims to conform to. The URL is a reference to StructureDefinition.url.

                          ShortProfiles this resource claims to conform to
                          Comments

                          It is up to the server and/or other infrastructure of policy to determine whether/how these claims are verified and/or updated over time. The list of profile URLs is a set.

                          Control0..*
                          Typeuri
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          Summarytrue
                          18. CodeSystem.meta.security
                          Definition

                          Security labels applied to this resource. These tags connect specific resources to the overall security policy and infrastructure.

                          ShortSecurity Labels applied to this resource
                          Comments

                          The security labels can be updated without changing the stated version of the resource The list of security labels is a set. Uniqueness is based the system/code, and version and display are ignored.

                          Control0..*
                          BindingUnless not suitable, these codes SHALL be taken from All Security Labels
                          (extensible to http://hl7.org/fhir/ValueSet/security-labels|3.0.2)

                          Security Labels from the Healthcare Privacy and Security Classification System.

                          TypeCoding
                          Summarytrue
                          20. CodeSystem.meta.tag
                          Definition

                          Tags applied to this resource. Tags are intended to be used to identify and relate resources to process and workflow, and applications are not required to consider the tags when interpreting the meaning of a resource.

                          ShortTags applied to this resource
                          Comments

                          The tags can be updated without changing the stated version of the resource. The list of tags is a set. Uniqueness is based the system/code, and version and display are ignored.

                          Control0..*
                          BindingFor example codes, see Common Tags
                          (example to http://hl7.org/fhir/ValueSet/common-tags|3.0.2)

                          Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones"

                          TypeCoding
                          Summarytrue
                          22. CodeSystem.implicitRules
                          Definition

                          A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content.

                          ShortA set of rules under which this content was created
                          Comments

                          Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element.

                          This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation.

                          Control0..1
                          Typeuri
                          Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          Summarytrue
                          24. CodeSystem.language
                          Definition

                          The base language in which the resource is written.

                          ShortLanguage of the resource content
                          Comments

                          Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).

                          Control0..1
                          BindingUnless not suitable, these codes SHALL be taken from Common Languages
                          (extensible to http://hl7.org/fhir/ValueSet/languages|3.0.2)

                          A human language.

                          Additional BindingsPurpose
                          All LanguagesMax Binding
                          Typecode
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          26. CodeSystem.text
                          Definition

                          A human-readable narrative that contains a summary of the resource, and may be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.

                          ShortText summary of the resource, for human interpretation
                          Comments

                          Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded in formation is added later.

                          Control0..1
                          This element is affected by the following invariants: dom-1
                          TypeNarrative
                          Alternate Namesnarrative, html, xhtml, display
                          28. CodeSystem.text.id
                          Definition

                          unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                          Shortxml:id (or equivalent in JSON)
                          Control0..1
                          Typestring
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          XML FormatIn the XML format, this property is represented as an attribute.
                          30. CodeSystem.text.extension
                          Definition

                          An Extension

                          ShortExtension
                          Control0..*
                          TypeExtension
                          SlicingThis element introduces a set of slices on CodeSystem.text.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                          • value @ url
                          • 32. CodeSystem.text.extension:text
                            Slice Nametext
                            Definition

                            R4B: CodeSystem.text additional types (Narrative) additional types from child elements (div, status)

                            ShortR4B: text additional types
                            Comments

                            Element CodeSystem.text is mapped to FHIR STU3 element CodeSystem.text as SourceIsBroaderThanTarget. The mappings for CodeSystem.text do not cover the following types: Narrative. The mappings for CodeSystem.text do not cover the following types based on type expansion: div, status. Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded information is added later.

                            Control0..1
                            TypeExtension(R4B: text additional types) (Complex Extension)
                            34. CodeSystem.text.status
                            Definition

                            The status of the narrative - whether it's entirely generated (from just the defined data or the extensions too), or whether a human authored it and it may contain additional data.

                            Shortgenerated | extensions | additional | empty
                            Control1..1
                            BindingThe codes SHALL be taken from NarrativeStatus
                            (required to http://hl7.org/fhir/ValueSet/narrative-status|3.0.2)

                            The status of a resource narrative

                            Typecode
                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                            36. CodeSystem.text.div
                            Definition

                            The actual narrative content, a stripped down version of XHTML.

                            ShortLimited xhtml content
                            Comments

                            The contents of the html element are an XHTML fragment containing only the basic html formatting elements described in chapters 7-11 and 15 of the HTML 4.0 standard, <a> elements (either name or href), images and internally contained stylesheets. The XHTML content may not contain a head, a body, external stylesheet references, scripts, forms, base/link/xlink, frames, iframes and objects.

                            Control1..1
                            Typexhtml
                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                            Invariantstxt-1: The narrative SHALL contain only the basic html formatting elements and attributes described in chapters 7-11 (except section 4 of chapter 9) and 15 of the HTML 4.0 standard, <a> elements (either name or href), images and internally contained style attributes (htmlchecks())
                            txt-2: The narrative SHALL have some non-whitespace content (htmlchecks())
                            38. CodeSystem.contained
                            Definition

                            These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.

                            ShortContained, inline Resources
                            Comments

                            This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again.

                            Control0..*
                            TypeResource
                            Alternate Namesinline resources, anonymous resources, contained resources
                            40. CodeSystem.extension
                            Definition

                            An Extension

                            ShortExtension
                            Control0..*
                            TypeExtension
                            SlicingThis element introduces a set of slices on CodeSystem.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                            • value @ url
                            • 42. CodeSystem.extension:supplements
                              Slice Namesupplements
                              Definition

                              R4B: CodeSystem.supplements (new:canonical(CodeSystem))

                              ShortR4B: Canonical URL of Code System this adds designations and properties to (new)
                              Comments

                              Element CodeSystem.supplements has a context of CodeSystem based on following the parent source element upwards and mapping to CodeSystem. Element CodeSystem.supplements has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element). The most common use of a code system supplement is to add additional language support.

                              Control0..1
                              This element is affected by the following invariants: ele-1
                              TypeExtension(R4B: Canonical URL of Code System this adds designations and properties to (new)) (Extension Type: uri(Cross-version Profile for R4B.CodeSystem for use in FHIR STU3, CodeSystem))
                              Is Modifierfalse
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                              44. CodeSystem.modifierExtension
                              Definition

                              May be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                              ShortExtensions that cannot be ignored
                              Comments

                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                              Control0..*
                              TypeExtension
                              Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                              Alternate Namesextensions, user content
                              46. CodeSystem.url
                              Definition

                              An absolute URI that is used to identify this code system when it is referenced in a specification, model, design or an instance. This SHALL be a URL, SHOULD be globally unique, and SHOULD be an address at which this code system is (or will be) published. The URL SHOULD include the major version of the code system. For more information see Technical and Business Versions. This is used in [Coding]{datatypes.html#Coding}.system.

                              ShortLogical URI to reference this code system (globally unique) (Coding.system)
                              Comments

                              Can be a urn:uuid: or a urn:oid:, but real http: addresses are preferred. Multiple instances may share the same url if they have a distinct version.

                              Control0..1
                              Typeuri
                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                              Summarytrue
                              Requirements

                              Allows the code system to be referenced by a single globally unique identifier.

                              48. CodeSystem.identifier
                              Definition

                              A formal identifier that is used to identify this code system when it is represented in other formats, or referenced in a specification, model, design or an instance.

                              ShortAdditional identifier for the code system
                              Comments

                              Typically, this is used for identifiers that can go in an HL7 V3 II (instance identifier) data type, e.g., to identify this code system outside of FHIR, where it is not possible to use the logical URI.

                              NoteThis is a business identifier, not a resource identifier (see discussion)
                              Control0..1
                              TypeIdentifier
                              Summarytrue
                              Requirements

                              Allows externally provided and/or usable business identifiers to be easily associated with the module.

                              50. CodeSystem.identifier.id
                              Definition

                              unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                              Shortxml:id (or equivalent in JSON)
                              Control0..1
                              Typestring
                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                              XML FormatIn the XML format, this property is represented as an attribute.
                              52. CodeSystem.identifier.extension
                              Definition

                              An Extension

                              ShortExtension
                              Control0..*
                              TypeExtension
                              SlicingThis element introduces a set of slices on CodeSystem.identifier.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                              • value @ url
                              • 54. CodeSystem.identifier.extension:identifier
                                Slice Nameidentifier
                                Definition

                                R4B: CodeSystem.identifier additional types (Identifier) additional types from child elements (assigner, period, system, type, use, value)

                                ShortR4B: Additional identifier for the code system (business identifier) additional types
                                Comments

                                Element CodeSystem.identifier is mapped to FHIR STU3 element CodeSystem.identifier as SourceIsBroaderThanTarget. The mappings for CodeSystem.identifier do not cover the following types: Identifier. The mappings for CodeSystem.identifier do not cover the following types based on type expansion: assigner, period, system, type, use, value. Typically, this is used for identifiers that can go in an HL7 V3 II (instance identifier) data type, and can then identify this code system outside of FHIR, where it is not possible to use the logical URI. Note that HL7 defines at least three identifiers for many of its code systems - the FHIR canonical URL, the OID and the V2 Table 0396 mnemonic code.

                                Control0..*
                                TypeExtension(R4B: Additional identifier for the code system (business identifier) additional types) (Extension Type: Identifier)
                                56. CodeSystem.identifier.use
                                Definition

                                The purpose of this identifier.

                                Shortusual | official | temp | secondary (If known)
                                Comments

                                This is labeled as "Is Modifier" because applications should not mistake a temporary id for a permanent one. Applications can assume that an identifier is permanent unless it explicitly says that it is temporary.

                                Control0..1
                                BindingThe codes SHALL be taken from IdentifierUse
                                (required to http://hl7.org/fhir/ValueSet/identifier-use|3.0.2)

                                Identifies the purpose for this identifier, if known .

                                Typecode
                                Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Requirements

                                Allows the appropriate identifier for a particular context of use to be selected from among a set of identifiers.

                                58. CodeSystem.identifier.type
                                Definition

                                A coded type for the identifier that can be used to determine which identifier to use for a specific purpose.

                                ShortDescription of identifier
                                Comments

                                This element deals only with general categories of identifiers. It SHOULD not be used for codes that correspond 1..1 with the Identifier.system. Some identifiers may fall into multiple categories due to common usage.

                                Where the system is known, a type is unnecessary because the type is always part of the system definition. However systems often need to handle identifiers where the system is not known. There is not a 1:1 relationship between type and system, since many different systems have the same type.

                                Control0..1
                                BindingUnless not suitable, these codes SHALL be taken from Identifier Type Codes
                                (extensible to http://hl7.org/fhir/ValueSet/identifier-type|3.0.2)

                                A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.

                                TypeCodeableConcept
                                Summarytrue
                                Requirements

                                Allows users to make use of identifiers when the identifier system is not known.

                                60. CodeSystem.identifier.system
                                Definition

                                Establishes the namespace for the value - that is, a URL that describes a set values that are unique.

                                ShortThe namespace for the identifier value
                                Control0..1
                                Typeuri
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Requirements

                                There are many sets of identifiers. To perform matching of two identifiers, we need to know what set we're dealing with. The system identifies a particular set of unique identifiers.

                                ExampleGeneral: http://www.acme.com/identifiers/patient
                                62. CodeSystem.identifier.value
                                Definition

                                The portion of the identifier typically relevant to the user and which is unique within the context of the system.

                                ShortThe value that is unique
                                Comments

                                If the value is a full URI, then the system SHALL be urn:ietf:rfc:3986. The value's primary purpose is computational mapping. As a result, it may be normalized for comparison purposes (e.g. removing non-significant whitespace, dashes, etc.) A value formatted for human display can be conveyed using the Rendered Value extension.

                                Control0..1
                                Typestring
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                ExampleGeneral: 123456
                                64. CodeSystem.identifier.period
                                Definition

                                Time period during which identifier is/was valid for use.

                                ShortTime period when id is/was valid for use
                                Control0..1
                                TypePeriod
                                Summarytrue
                                66. CodeSystem.identifier.assigner
                                Definition

                                Organization that issued/manages the identifier.

                                ShortOrganization that issued id (may be just text)
                                Comments

                                The Identifier.assigner may omit the .reference element and only contain a .display element reflecting the name or other textual information about the assigning organization.

                                Control0..1
                                TypeReference(Organization)
                                Summarytrue
                                68. CodeSystem.version
                                Definition

                                The identifier that is used to identify this version of the code system when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the code system author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequence. This is used in [Coding]{datatypes.html#Coding}.version.

                                ShortBusiness version of the code system (Coding.version)
                                Comments

                                There may be different code system instances that have the same identifier but different versions. The version can be appended to the url in a reference to allow a refrence to a particular business version of the code system with the format [url]|[version].

                                NoteThis is a business version Id, not a resource version Id (see discussion)
                                Control0..1
                                Typestring
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                70. CodeSystem.name
                                Definition

                                A natural language name identifying the code system. This name should be usable as an identifier for the module by machine processing applications such as code generation.

                                ShortName for this code system (computer friendly)
                                Comments

                                The name is not expected to be globally unique. The name should be a simple alpha-numeric type name to ensure that it is computable friendly.

                                Control0..1
                                Typestring
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Requirements

                                Support human navigation and code generation.

                                72. CodeSystem.title
                                Definition

                                A short, descriptive, user-friendly title for the code system.

                                ShortName for this code system (human friendly)
                                Comments

                                This name does not need to be machine-processing friendly and may contain punctuation, white-space, etc.

                                Control0..1
                                Typestring
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                74. CodeSystem.status
                                Definition

                                The status of this code system. Enables tracking the life-cycle of the content.

                                Shortdraft | active | retired | unknown
                                Comments

                                Allows filtering of code systems that are appropriate for use vs. not.
                                This is labeled as "Is Modifier" because applications should not use a retired code system without due consideration.

                                Control1..1
                                BindingThe codes SHALL be taken from PublicationStatus
                                (required to http://hl7.org/fhir/ValueSet/publication-status|3.0.2)

                                The lifecycle status of a Value Set or Concept Map.

                                Typecode
                                Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                76. CodeSystem.experimental
                                Definition

                                A boolean value to indicate that this code system is authored for testing purposes (or education/evaluation/marketing), and is not intended to be used for genuine usage.

                                ShortFor testing purposes, not real usage
                                Comments

                                Allows filtering of code system that are appropriate for use vs. not. This is labeled as "Is Modifier" because applications should not use an experimental code system in production.

                                Control0..1
                                Typeboolean
                                Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Requirements

                                Enables experimental content to be developed following the same lifecycle that would be used for a production-level code system.

                                78. CodeSystem.date
                                Definition

                                The date (and optionally time) when the code system was published. The date must change if and when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the code system changes.

                                ShortDate this was last changed
                                Comments

                                Note that this is not the same as the resource last-modified-date, since the resource may be a secondary representation of the code system. Additional specific dates may be added as extensions or be found by consulting Provenances associated with past versions of the resource.

                                Control0..1
                                TypedateTime
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Alternate NamesRevision Date
                                80. CodeSystem.publisher
                                Definition

                                The name of the individual or organization that published the code system.

                                ShortName of the publisher (organization or individual)
                                Comments

                                Usually an organization, but may be an individual. The publisher (or steward) of the code system is the organization or individual primarily responsible for the maintenance and upkeep of the code system. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the code system. This item SHOULD be populated unless the information is available from context.

                                Control0..1
                                Typestring
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Requirements

                                Helps establish the "authority/credibility" of the code system. May also allow for contact.

                                82. CodeSystem.contact
                                Definition

                                Contact details to assist a user in finding and communicating with the publisher.

                                ShortContact details for the publisher
                                Comments

                                May be a web site, an email address, a telephone number, etc.

                                Control0..*
                                TypeContactDetail
                                Summarytrue
                                84. CodeSystem.contact.id
                                Definition

                                unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                Shortxml:id (or equivalent in JSON)
                                Control0..1
                                Typestring
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                XML FormatIn the XML format, this property is represented as an attribute.
                                86. CodeSystem.contact.extension
                                Definition

                                An Extension

                                ShortExtension
                                Control0..*
                                TypeExtension
                                SlicingThis element introduces a set of slices on CodeSystem.contact.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                • value @ url
                                • 88. CodeSystem.contact.extension:contact
                                  Slice Namecontact
                                  Definition

                                  R4B: CodeSystem.contact additional types (ContactDetail) additional types from child elements (name, telecom)

                                  ShortR4B: contact additional types
                                  Comments

                                  Element CodeSystem.contact is mapped to FHIR STU3 element CodeSystem.contact as SourceIsBroaderThanTarget. The mappings for CodeSystem.contact do not cover the following types: ContactDetail. The mappings for CodeSystem.contact do not cover the following types based on type expansion: name, telecom. May be a web site, an email address, a telephone number, etc.

                                  Control0..*
                                  TypeExtension(R4B: contact additional types) (Complex Extension)
                                  90. CodeSystem.contact.name
                                  Definition

                                  The name of an individual to contact.

                                  ShortName of an individual to contact
                                  Comments

                                  If there is no named individual, the telecom information is for the organization as a whole.

                                  Control0..1
                                  Typestring
                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                  Summarytrue
                                  92. CodeSystem.contact.telecom
                                  Definition

                                  The contact details for the individual (if a name was provided) or the organization.

                                  ShortContact details for individual or organization
                                  Control0..*
                                  TypeContactPoint
                                  Summarytrue
                                  94. CodeSystem.description
                                  Definition

                                  A free text natural language description of the code system from a consumer's perspective.

                                  ShortNatural language description of the code system
                                  Comments

                                  This description can be used to capture details such as why the code system was built, comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the code system as conveyed in the 'text' field of the resource itself. This item SHOULD be populated unless the information is available from context (e.g. the language of the profile is presumed to be the predominant language in the place the profile was created).

                                  Control0..1
                                  Typemarkdown
                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                  Alternate NamesScope, Purpose
                                  96. CodeSystem.useContext
                                  Definition

                                  The content was developed with a focus and intent of supporting the contexts that are listed. These terms may be used to assist with indexing and searching for appropriate code system instances.

                                  ShortContext the content is intended to support
                                  Comments

                                  When multiple useContexts are specified, there is no expectation whether all or any of the contexts apply.

                                  Control0..*
                                  TypeUsageContext
                                  Summarytrue
                                  Requirements

                                  Assist in searching for appropriate content.

                                  98. CodeSystem.useContext.id
                                  Definition

                                  unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                  Shortxml:id (or equivalent in JSON)
                                  Control0..1
                                  Typestring
                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                  XML FormatIn the XML format, this property is represented as an attribute.
                                  100. CodeSystem.useContext.extension
                                  Definition

                                  An Extension

                                  ShortExtension
                                  Control0..*
                                  TypeExtension
                                  SlicingThis element introduces a set of slices on CodeSystem.useContext.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                  • value @ url
                                  • 102. CodeSystem.useContext.extension:useContext
                                    Slice NameuseContext
                                    Definition

                                    R4B: CodeSystem.useContext additional types (UsageContext) additional types from child elements (code, value[x])

                                    ShortR4B: The context that the content is intended to support additional types
                                    Comments

                                    Element CodeSystem.useContext is mapped to FHIR STU3 element CodeSystem.useContext as SourceIsBroaderThanTarget. The mappings for CodeSystem.useContext do not cover the following types: UsageContext. The mappings for CodeSystem.useContext do not cover the following types based on type expansion: code, value[x]. When multiple useContexts are specified, there is no expectation that all or any of the contexts apply.

                                    Control0..*
                                    TypeExtension(R4B: The context that the content is intended to support additional types) (Complex Extension)
                                    104. CodeSystem.useContext.code
                                    Definition

                                    A code that identifies the type of context being specified by this usage context.

                                    ShortType of context being specified
                                    Control1..1
                                    BindingUnless not suitable, these codes SHALL be taken from UsageContextType
                                    (extensible to http://hl7.org/fhir/ValueSet/usage-context-type|3.0.2)

                                    A code that specifies a type of context being specified by a usage context

                                    TypeCoding
                                    Summarytrue
                                    106. CodeSystem.useContext.value[x]
                                    Definition

                                    A value that defines the context specified in this context of use. The interpretation of the value is defined by the code.

                                    ShortValue that defines the context
                                    Control1..1
                                    BindingFor example codes, see Context of Use ValueSet
                                    (example to http://hl7.org/fhir/ValueSet/use-context|3.0.2)

                                    A code that defines the specific value for the context being specified

                                    TypeChoice of: CodeableConcept, Quantity, Range
                                    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                    Summarytrue
                                    108. CodeSystem.jurisdiction
                                    Definition

                                    A legal or geographic region in which the code system is intended to be used.

                                    ShortIntended jurisdiction for code system (if applicable)
                                    Comments

                                    It may be possible for the code system to be used in jurisdictions other than those for which it was originally designed or intended.

                                    Control0..*
                                    BindingUnless not suitable, these codes SHALL be taken from Jurisdiction ValueSet
                                    (extensible to http://hl7.org/fhir/ValueSet/jurisdiction|3.0.2)

                                    Countries and regions within which this artifact is targeted for use

                                    TypeCodeableConcept
                                    Summarytrue
                                    110. CodeSystem.purpose
                                    Definition

                                    Explaination of why this code system is needed and why it has been designed as it has.

                                    ShortWhy this code system is defined
                                    Comments

                                    This element does not describe the usage of the code system Instead it provides traceability of ''why'' the resource is either needed or ''why'' it is defined as it is. This may be used to point to source materials or specifications that drove the structure of this code system.

                                    Control0..1
                                    Typemarkdown
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    112. CodeSystem.copyright
                                    Definition

                                    A copyright statement relating to the code system and/or its contents. Copyright statements are generally legal restrictions on the use and publishing of the code system.

                                    ShortUse and/or publishing restrictions
                                    Comments

                                    ... Sometimes, the copyright differs between the code system and the codes that are included. The copyright statement should clearly differentiate between these when required.

                                    Control0..1
                                    Typemarkdown
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Requirements

                                    Consumers must be able to determine any legal restrictions on the use of the code system and/or its content.

                                    Alternate NamesLicense, Restrictions
                                    114. CodeSystem.caseSensitive
                                    Definition

                                    If code comparison is case sensitive when codes within this system are compared to each other.

                                    ShortIf code comparison is case sensitive
                                    Comments

                                    If this value is missing, then it is not specified whether a code system is case sensitive or not. When the rule is not known, Postel's law should be followed: produce codes with the correct case, and accept codes in any case. This element is primarily provided to support validation software.

                                    Control0..1
                                    Typeboolean
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Summarytrue
                                    116. CodeSystem.valueSet
                                    Definition

                                    Canonical URL of value set that contains the entire code system.

                                    ShortCanonical URL for value set with entire code system
                                    Comments

                                    The definition of the value set SHALL include all codes from this code system, and it SHALL be immutable.

                                    Control0..1
                                    Typeuri
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Summarytrue
                                    118. CodeSystem.hierarchyMeaning
                                    Definition

                                    The meaning of the hierarchy of concepts.

                                    Shortgrouped-by | is-a | part-of | classified-with
                                    Control0..1
                                    BindingThe codes SHALL be taken from CodeSystemHierarchyMeaning
                                    (required to http://hl7.org/fhir/ValueSet/codesystem-hierarchy-meaning|3.0.2)

                                    The meaning of the hierarchy of concepts in a code system

                                    Typecode
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Summarytrue
                                    120. CodeSystem.compositional
                                    Definition

                                    True If code system defines a post-composition grammar.

                                    ShortIf code system defines a post-composition grammar
                                    Comments

                                    Note that the code system resource does not define what the compositional grammar is, only whether or not there is one.

                                    Control0..1
                                    Typeboolean
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Summarytrue
                                    Alternate Namesgrammar
                                    122. CodeSystem.versionNeeded
                                    Definition

                                    This flag is used to signify that the code system has not (or does not) maintain the definitions, and a version must be specified when referencing this code system.

                                    ShortIf definitions are not stable
                                    Comments

                                    Best practice is that code systems do not redefine concepts, or that if concepts are redefined, a new code system definition is created. But this is not always possible, so some code systems may be defined as 'versionNeeded'.

                                    Control0..1
                                    Typeboolean
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Summarytrue
                                    124. CodeSystem.content
                                    Definition

                                    How much of the content of the code system - the concepts and codes it defines - are represented in this resource.

                                    Shortnot-present | example | fragment | complete
                                    Control1..1
                                    BindingThe codes SHALL be taken from CodeSystemContentMode
                                    (required to http://hl7.org/fhir/ValueSet/codesystem-content-mode|3.0.2)

                                    How much of the content of the code system - the concepts and codes it defines - are represented in a code system resource

                                    Typecode
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Summarytrue
                                    126. CodeSystem.content.id
                                    Definition

                                    unique id for the element within a resource (for internal references)

                                    Shortxml:id (or equivalent in JSON)
                                    Control0..1
                                    Typestring
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    XML FormatIn the XML format, this property is represented as an attribute.
                                    128. CodeSystem.content.extension
                                    Definition

                                    An Extension

                                    ShortExtension
                                    Control0..*
                                    TypeExtension
                                    SlicingThis element introduces a set of slices on CodeSystem.content.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                    • value @ url
                                    • 130. CodeSystem.content.extension:content
                                      Slice Namecontent
                                      Definition

                                      R4B: CodeSystem.content

                                      ShortR4B: not-present | example | fragment | complete | supplement
                                      Comments

                                      Element CodeSystem.content is mapped to FHIR STU3 element CodeSystem.content as SourceIsBroaderThanTarget.

                                      Control0..1
                                      This element is affected by the following invariants: ele-1
                                      TypeExtension(R4B: not-present | example | fragment | complete | supplement) (Extension Type: code)
                                      Is Modifierfalse
                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                      132. CodeSystem.content.value
                                      Definition

                                      Primitive value for code

                                      ShortPrimitive value for code
                                      Control0..1
                                      Typecode
                                      XML FormatIn the XML format, this property is represented as an attribute.
                                      134. CodeSystem.count
                                      Definition

                                      The total number of concepts defined by the code system. Where the code system has a compositional grammar, the count refers to the number of base (primitive) concepts.

                                      ShortTotal concepts in the code system
                                      Comments

                                      The count of concepts defined in this resource cannot be more than this value, but may be less for several reasons - see the content value.

                                      Control0..1
                                      TypeunsignedInt
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      136. CodeSystem.filter
                                      Definition

                                      A filter that can be used in a value set compose statement when selecting concepts using a filter.

                                      ShortFilter that can be used in a value set
                                      Control0..*
                                      TypeBackboneElement
                                      Summarytrue
                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                      138. CodeSystem.filter.id
                                      Definition

                                      unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                      Shortxml:id (or equivalent in JSON)
                                      Control0..1
                                      Typestring
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      XML FormatIn the XML format, this property is represented as an attribute.
                                      140. CodeSystem.filter.extension
                                      Definition

                                      May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                      ShortAdditional Content defined by implementations
                                      Comments

                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                      Control0..*
                                      TypeExtension
                                      Alternate Namesextensions, user content
                                      142. CodeSystem.filter.modifierExtension
                                      Definition

                                      May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                      ShortExtensions that cannot be ignored
                                      Comments

                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                      Control0..*
                                      TypeExtension
                                      Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                      Summarytrue
                                      Alternate Namesextensions, user content, modifiers
                                      144. CodeSystem.filter.code
                                      Definition

                                      The code that identifies this filter when it is used in the instance.

                                      ShortCode that identifies the filter
                                      Control1..1
                                      Typecode
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      146. CodeSystem.filter.description
                                      Definition

                                      A description of how or why the filter is used.

                                      ShortHow or why the filter is used
                                      Control0..1
                                      Typestring
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      148. CodeSystem.filter.operator
                                      Definition

                                      A list of operators that can be used with the filter.

                                      ShortOperators that can be used with filter
                                      Control1..*
                                      BindingThe codes SHALL be taken from FilterOperator
                                      (required to http://hl7.org/fhir/ValueSet/filter-operator|3.0.2)

                                      The kind of operation to perform as a part of a property based filter.

                                      Typecode
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      150. CodeSystem.filter.value
                                      Definition

                                      A description of what the value for the filter should be.

                                      ShortWhat to use for the value
                                      Control1..1
                                      Typestring
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      152. CodeSystem.property
                                      Definition

                                      A property defines an additional slot through which additional information can be provided about a concept.

                                      ShortAdditional information supplied about each concept
                                      Control0..*
                                      TypeBackboneElement
                                      Summarytrue
                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                      154. CodeSystem.property.id
                                      Definition

                                      unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                      Shortxml:id (or equivalent in JSON)
                                      Control0..1
                                      Typestring
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      XML FormatIn the XML format, this property is represented as an attribute.
                                      156. CodeSystem.property.extension
                                      Definition

                                      May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                      ShortAdditional Content defined by implementations
                                      Comments

                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                      Control0..*
                                      TypeExtension
                                      Alternate Namesextensions, user content
                                      158. CodeSystem.property.modifierExtension
                                      Definition

                                      May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                      ShortExtensions that cannot be ignored
                                      Comments

                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                      Control0..*
                                      TypeExtension
                                      Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                      Summarytrue
                                      Alternate Namesextensions, user content, modifiers
                                      160. CodeSystem.property.code
                                      Definition

                                      A code that is used to identify the property. The code is used internally (in CodeSystem.concept.property.code) and also externally, such as in property filters.

                                      ShortIdentifies the property on the concepts, and when referred to in operations
                                      Control1..1
                                      Typecode
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      162. CodeSystem.property.uri
                                      Definition

                                      Reference to the formal meaning of the property. One possible source of meaning is the Concept Properties code system.

                                      ShortFormal identifier for the property
                                      Control0..1
                                      Typeuri
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      164. CodeSystem.property.description
                                      Definition

                                      A description of the property- why it is defined, and how its value might be used.

                                      ShortWhy the property is defined, and/or what it conveys
                                      Control0..1
                                      Typestring
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      166. CodeSystem.property.type
                                      Definition

                                      The type of the property value. Properties of type "code" contain a code defined by the code system (e.g. a reference to anotherr defined concept).

                                      Shortcode | Coding | string | integer | boolean | dateTime
                                      Control1..1
                                      BindingThe codes SHALL be taken from PropertyType
                                      (required to http://hl7.org/fhir/ValueSet/concept-property-type|3.0.2)

                                      The type of a property value

                                      Typecode
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Summarytrue
                                      168. CodeSystem.property.type.id
                                      Definition

                                      unique id for the element within a resource (for internal references)

                                      Shortxml:id (or equivalent in JSON)
                                      Control0..1
                                      Typestring
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      XML FormatIn the XML format, this property is represented as an attribute.
                                      170. CodeSystem.property.type.extension
                                      Definition

                                      An Extension

                                      ShortExtension
                                      Control0..*
                                      TypeExtension
                                      SlicingThis element introduces a set of slices on CodeSystem.property.type.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                      • value @ url
                                      • 172. CodeSystem.property.type.extension:type
                                        Slice Nametype
                                        Definition

                                        R4B: CodeSystem.property.type

                                        ShortR4B: code | Coding | string | integer | boolean | dateTime | decimal
                                        Comments

                                        Element CodeSystem.property.type is mapped to FHIR STU3 element CodeSystem.property.type as SourceIsBroaderThanTarget.

                                        Control0..1
                                        This element is affected by the following invariants: ele-1
                                        TypeExtension(R4B: code | Coding | string | integer | boolean | dateTime | decimal) (Extension Type: code)
                                        Is Modifierfalse
                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                        174. CodeSystem.property.type.value
                                        Definition

                                        Primitive value for code

                                        ShortPrimitive value for code
                                        Control0..1
                                        Typecode
                                        XML FormatIn the XML format, this property is represented as an attribute.
                                        176. CodeSystem.concept
                                        Definition

                                        Concepts that are in the code system. The concept definitions are inherently hierarchical, but the definitions must be consulted to determine what the meaning of the hierarchical relationships are.

                                        ShortConcepts in the code system
                                        Comments

                                        If this is empty, it means that the code system resource does not represent the content of the code system.

                                        Control0..*
                                        TypeBackboneElement
                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                        178. CodeSystem.concept.id
                                        Definition

                                        unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                        Shortxml:id (or equivalent in JSON)
                                        Control0..1
                                        Typestring
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        XML FormatIn the XML format, this property is represented as an attribute.
                                        180. CodeSystem.concept.extension
                                        Definition

                                        May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                        ShortAdditional Content defined by implementations
                                        Comments

                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                        Control0..*
                                        TypeExtension
                                        Alternate Namesextensions, user content
                                        182. CodeSystem.concept.modifierExtension
                                        Definition

                                        May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                        ShortExtensions that cannot be ignored
                                        Comments

                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                        Control0..*
                                        TypeExtension
                                        Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                        Summarytrue
                                        Alternate Namesextensions, user content, modifiers
                                        184. CodeSystem.concept.code
                                        Definition

                                        A code - a text symbol - that uniquely identifies the concept within the code system.

                                        ShortCode that identifies concept
                                        Control1..1
                                        Typecode
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        186. CodeSystem.concept.display
                                        Definition

                                        A human readable string that is the recommended default way to present this concept to a user.

                                        ShortText to display to the user
                                        Control0..1
                                        Typestring
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        188. CodeSystem.concept.definition
                                        Definition

                                        The formal definition of the concept. The code system resource does not make formal definitions required, because of the prevalence of legacy systems. However, they are highly recommended, as without them there is no formal meaning associated with the concept.

                                        ShortFormal definition
                                        Control0..1
                                        Typestring
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        190. CodeSystem.concept.designation
                                        Definition

                                        Additional representations for the concept - other languages, aliases, specialized purposes, used for particular purposes, etc.

                                        ShortAdditional representations for the concept
                                        Control0..*
                                        TypeBackboneElement
                                        Requirements

                                        Many concept definition systems support multiple representations, in multiple languages, and for multiple purposes.

                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                        192. CodeSystem.concept.designation.id
                                        Definition

                                        unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                        Shortxml:id (or equivalent in JSON)
                                        Control0..1
                                        Typestring
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        XML FormatIn the XML format, this property is represented as an attribute.
                                        194. CodeSystem.concept.designation.extension
                                        Definition

                                        May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                        ShortAdditional Content defined by implementations
                                        Comments

                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                        Control0..*
                                        TypeExtension
                                        Alternate Namesextensions, user content
                                        196. CodeSystem.concept.designation.modifierExtension
                                        Definition

                                        May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                        ShortExtensions that cannot be ignored
                                        Comments

                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                        Control0..*
                                        TypeExtension
                                        Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                        Summarytrue
                                        Alternate Namesextensions, user content, modifiers
                                        198. CodeSystem.concept.designation.language
                                        Definition

                                        The language this designation is defined for.

                                        ShortHuman language of the designation
                                        Comments

                                        In the absence of a language, the resource language applies.

                                        Control0..1
                                        BindingUnless not suitable, these codes SHALL be taken from Common Languages
                                        (extensible to http://hl7.org/fhir/ValueSet/languages|3.0.2)

                                        A human language.

                                        Additional BindingsPurpose
                                        All LanguagesMax Binding
                                        Typecode
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        200. CodeSystem.concept.designation.use
                                        Definition

                                        A code that details how this designation would be used.

                                        ShortDetails how this designation would be used
                                        Comments

                                        If no use is provided, the designation can be assumed to be suitable for general display to a human user.

                                        Control0..1
                                        BindingUnless not suitable, these codes SHALL be taken from Designation Use
                                        (extensible to http://hl7.org/fhir/ValueSet/designation-use|3.0.2)

                                        Details of how a designation would be used.

                                        TypeCoding
                                        202. CodeSystem.concept.designation.value
                                        Definition

                                        The text value for this designation.

                                        ShortThe text value for this designation
                                        Control1..1
                                        Typestring
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        204. CodeSystem.concept.property
                                        Definition

                                        A property value for this concept.

                                        ShortProperty value for the concept
                                        Control0..*
                                        TypeBackboneElement
                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                        206. CodeSystem.concept.property.id
                                        Definition

                                        unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                        Shortxml:id (or equivalent in JSON)
                                        Control0..1
                                        Typestring
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        XML FormatIn the XML format, this property is represented as an attribute.
                                        208. CodeSystem.concept.property.extension
                                        Definition

                                        An Extension

                                        ShortExtension
                                        Control0..*
                                        TypeExtension
                                        SlicingThis element introduces a set of slices on CodeSystem.concept.property.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                        • value @ url
                                        • 210. CodeSystem.concept.property.extension:value
                                          Slice Namevalue
                                          Definition

                                          R4B: CodeSystem.concept.property.value[x] additional types (decimal)

                                          ShortR4B: value additional types
                                          Comments

                                          Element CodeSystem.concept.property.value[x] is mapped to FHIR STU3 element CodeSystem.concept.property.value[x] as SourceIsBroaderThanTarget. The mappings for CodeSystem.concept.property.value[x] do not cover the following types: decimal. The target context CodeSystem.concept.property.value[x] is a choice-type element and cannot directly hold extensions. The context is moved up to parent element CodeSystem.concept.property.

                                          Control0..1
                                          This element is affected by the following invariants: ele-1
                                          TypeExtension(R4B: value additional types) (Extension Type: decimal)
                                          Is Modifierfalse
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))
                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                          212. CodeSystem.concept.property.modifierExtension
                                          Definition

                                          May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                          ShortExtensions that cannot be ignored
                                          Comments

                                          There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                          Control0..*
                                          TypeExtension
                                          Is Modifiertrue because No Modifier Reason provideed in previous versions of FHIR
                                          Summarytrue
                                          Alternate Namesextensions, user content, modifiers
                                          214. CodeSystem.concept.property.code
                                          Definition

                                          A code that is a reference to CodeSystem.property.code.

                                          ShortReference to CodeSystem.property.code
                                          Control1..1
                                          Typecode
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          216. CodeSystem.concept.property.value[x]
                                          Definition

                                          The value of this property.

                                          ShortValue of the property for this concept
                                          Control1..1
                                          TypeChoice of: code, Coding, string, integer, boolean, dateTime
                                          [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          218. CodeSystem.concept.concept
                                          Definition

                                          Defines children of a concept to produce a hierarchy of concepts. The nature of the relationships is variable (is-a/contains/categorizes) - see hierarchyMeaning.

                                          ShortChild Concepts (is-a/contains/categorizes)
                                          Control0..*
                                          TypeSeettp://hl7.org/fhir/StructureDefinition/CodeSystem#CodeSystem.concept