This resource is primarily used for the identification and definition of a medication for the purposes of prescribing, dispensing, and administering a medication as well as for making statements about medication use.

A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.

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. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.

An Extension

STU3: Medication.status (new:code)

Element Medication.status has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.status has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element). An externally-defined extension that has been mapped as the representation of FHIR STU3 element Medication.status: http://hl7.org/fhir/StructureDefinition/artifact-status. This status is not intended to specify if a medication is part of a formulary.

STU3: Medication.isBrand (new:boolean)

Element Medication.isBrand has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.isBrand has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.isOverTheCounter (new:boolean)

Element Medication.isOverTheCounter has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.isOverTheCounter has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.package (new:BackboneElement)

Element Medication.package has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.package has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.image (new:Attachment)

Element Medication.image has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.image has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

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 and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. 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.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

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.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

A code to indicate if the medication is in active use.

This status is intended to identify if the medication in a local system is in active use within a drug database or inventory. For example, a pharmacy system may create a new drug file record for a compounded product "ABC Hospital Special Cream" with an active status. At some point in the future, it may be determined that the drug record was created with an error and the status is changed to "entered in error". This status is not intended to specify if a medication is part of a particular formulary. It is possible that the drug record may be referenced by multiple formularies or catalogues and each of those entries would have a separate status.

A coded concept defining if the medication is in active use.

STU3: Medication.meta additional types (Meta) additional types from child elements (lastUpdated, profile, security, tag, versionId)

Element Medication.meta is mapped to FHIR R4B element Medication.meta as SourceIsBroaderThanTarget. The mappings for Medication.meta do not cover the following types: Meta. The mappings for Medication.meta do not cover the following types based on type expansion: lastUpdated, profile, security, tag, versionId.

STU3: Medication.text additional types (Narrative) additional types from child elements (div, status)

Element Medication.text is mapped to FHIR R4B element Medication.text as SourceIsBroaderThanTarget. The mappings for Medication.text do not cover the following types: Narrative. The mappings for Medication.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 in formation is added later.

STU3: Medication.status (new:code)

Element Medication.status has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.status has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element). An externally-defined extension that has been mapped as the representation of FHIR STU3 element Medication.status: http://hl7.org/fhir/StructureDefinition/artifact-status. This status is not intended to specify if a medication is part of a formulary.

STU3: Medication.isBrand (new:boolean)

Element Medication.isBrand has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.isBrand has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.isOverTheCounter (new:boolean)

Element Medication.isOverTheCounter has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.isOverTheCounter has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.package (new:BackboneElement)

Element Medication.package has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.package has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.image (new:Attachment)

Element Medication.image has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.image has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.manufacturer additional types from child elements (display, identifier, reference)

Element Medication.manufacturer is mapped to FHIR R4B element Medication.manufacturer as SourceIsBroaderThanTarget. The mappings for Medication.manufacturer do not cover the following types based on type expansion: display, identifier, reference. The standard extension alternate-reference has been mapped as the representation of FHIR STU3 element Medication.manufacturer with unmapped reference targets: Organization.

STU3: Medication.ingredient.item[x]

Element Medication.ingredient.item[x] is mapped to FHIR R4B element Medication.ingredient.item[x] as SourceIsBroaderThanTarget. The standard extension alternate-reference has been mapped as the representation of FHIR STU3 element Medication.ingredient.item[x] with unmapped reference targets: Medication, Substance. Source element Medication.ingredient.item[x] has unmapped reference types. While the target element Medication.ingredient.item[x] is a choice type and does not allow extensions, the alternate-reference extension can be applied to Reference values within it.

STU3: Medication.ingredient.amount additional types (Ratio) additional types from child elements (denominator, numerator)

Element Medication.ingredient.amount is mapped to FHIR R4B element Medication.ingredient.strength as SourceIsBroaderThanTarget. The mappings for Medication.ingredient.amount do not cover the following types: Ratio. The mappings for Medication.ingredient.amount do not cover the following types based on type expansion: denominator, numerator.

This resource is primarily used for the identification and definition of a medication for the purposes of prescribing, dispensing, and administering a medication as well as for making statements about medication use.

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

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

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

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

An Extension

STU3: Medication.meta additional types (Meta) additional types from child elements (lastUpdated, profile, security, tag, versionId)

Element Medication.meta is mapped to FHIR R4B element Medication.meta as SourceIsBroaderThanTarget. The mappings for Medication.meta do not cover the following types: Meta. The mappings for Medication.meta do not cover the following types based on type expansion: lastUpdated, profile, security, tag, versionId.

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

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.

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

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. This is equivalent to the HTTP Last-Modified and SHOULD have the same value on a read interaction.

A uri that identifies the source system of the resource. This provides a minimal amount of Provenance information that can be used to track or differentiate the source of information in the resource. The source may identify another FHIR server, document, message, database, etc.

In the provenance resource, this corresponds to Provenance.entity.what[x]. The exact use of the source (and the implied Provenance.entity.role) is left to implementer discretion. Only one nominated source is allowed; for additional provenance details, a full Provenance resource should be used.

This element can be used to indicate where the current master source of a resource that has a canonical URL if the resource is no longer hosted at the canonical URL.

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

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.

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

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.

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.

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.

A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.

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. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.

The base language in which the resource is written.

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).

IETF language tag

A human-readable narrative that contains a summary of the resource and can 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.

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.

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

An Extension

STU3: Medication.text additional types (Narrative) additional types from child elements (div, status)

Element Medication.text is mapped to FHIR R4B element Medication.text as SourceIsBroaderThanTarget. The mappings for Medication.text do not cover the following types: Narrative. The mappings for Medication.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 in formation is added later.

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.

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

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 SHALL NOT contain a head, a body, external stylesheet references, scripts, forms, base/link/xlink, frames, iframes and objects.

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.

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. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels.

An Extension

STU3: Medication.status (new:code)

Element Medication.status has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.status has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element). An externally-defined extension that has been mapped as the representation of FHIR STU3 element Medication.status: http://hl7.org/fhir/StructureDefinition/artifact-status. This status is not intended to specify if a medication is part of a formulary.

STU3: Medication.isBrand (new:boolean)

Element Medication.isBrand has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.isBrand has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.isOverTheCounter (new:boolean)

Element Medication.isOverTheCounter has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.isOverTheCounter has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.package (new:BackboneElement)

Element Medication.package has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.package has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

STU3: Medication.image (new:Attachment)

Element Medication.image has a context of Medication based on following the parent source element upwards and mapping to Medication. Element Medication.image has no mapping targets in FHIR R4B. Typically, this is because the element has been added (is a new element).

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 and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. 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.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

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.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

Business identifier for this medication.

The serial number could be included as an identifier.

A code (or set of codes) that specify this medication, or a textual description if no code is available. Usage note: This could be a standard medication code such as a code from RxNorm, SNOMED CT, IDMP etc. It could also be a national or local formulary code, optionally with translations to other code systems.

Depending on the context of use, the code that was actually selected by the user (prescriber, dispenser, etc.) will have the coding.userSelected set to true. As described in the coding datatype: "A coding may be marked as a "userSelected" if a user selected the particular coded value in a user interface (e.g. the user selects an item in a pick-list). If a user selected coding exists, it is the preferred choice for performing translations etc. Other codes can only be literal translations to alternative code systems, or codes at a lower level of granularity (e.g. a generic code for a vendor-specific primary one).

A coded concept that defines the type of a medication.

A code to indicate if the medication is in active use.

This status is intended to identify if the medication in a local system is in active use within a drug database or inventory. For example, a pharmacy system may create a new drug file record for a compounded product "ABC Hospital Special Cream" with an active status. At some point in the future, it may be determined that the drug record was created with an error and the status is changed to "entered in error". This status is not intended to specify if a medication is part of a particular formulary. It is possible that the drug record may be referenced by multiple formularies or catalogues and each of those entries would have a separate status.

A coded concept defining if the medication is in active use.

Describes the details of the manufacturer of the medication product. This is not intended to represent the distributor of a medication product.

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

An Extension

STU3: Medication.manufacturer additional types from child elements (display, identifier, reference)

Element Medication.manufacturer is mapped to FHIR R4B element Medication.manufacturer as SourceIsBroaderThanTarget. The mappings for Medication.manufacturer do not cover the following types based on type expansion: display, identifier, reference. The standard extension alternate-reference has been mapped as the representation of FHIR STU3 element Medication.manufacturer with unmapped reference targets: Organization.

A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources.

Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries. Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server.

The expected type of the target of the reference. If both Reference.type and Reference.reference are populated and Reference.reference is a FHIR URL, both SHALL be consistent.

The type is the Canonical URL of Resource Definition that is the type this reference refers to. References are URLs that are relative to http://hl7.org/fhir/StructureDefinition/ e.g. "Patient" is a reference to http://hl7.org/fhir/StructureDefinition/Patient. Absolute URLs are only allowed for logical models (and can only be used in references in logical models, not resources).

This element is used to indicate the type of the target of the reference. This may be used which ever of the other elements are populated (or not). In some cases, the type of the target may be determined by inspection of the reference (e.g. a RESTful URL) or by resolving the target of the reference; if both the type and a reference is provided, the reference SHALL resolve to a resource of the same type as that specified.

An identifier for the target resource. This is used when there is no way to reference the other resource directly, either because the entity it represents is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference.

When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy.

When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference

Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it.

Reference is intended to point to a structure that can potentially be expressed as a FHIR resource, though there is no need for it to exist as an actual FHIR resource instance - except in as much as an application wishes to actual find the target of the reference. The content referred to be the identifier must meet the logical constraints implied by any limitations on what resource types are permitted for the reference. For example, it would not be legitimate to send the identifier for a drug prescription if the type were Reference(Observation|DiagnosticReport). One of the use-cases for Reference.identifier is the situation where no FHIR representation exists (where the type is Reference (Any).

Plain text narrative that identifies the resource in addition to the resource reference.

This is generally not the same as the Resource.text of the referenced resource. The purpose is to identify what's being referenced, not to fully describe it.

Describes the form of the item. Powder; tablets; capsule.

When Medication is referenced from MedicationRequest, this is the ordered form. When Medication is referenced within MedicationDispense, this is the dispensed form. When Medication is referenced within MedicationAdministration, this is administered form.

A coded concept defining the form of a medication.

Specific amount of the drug in the packaged product. For example, when specifying a product that has the same strength (For example, Insulin glargine 100 unit per mL solution for injection), this attribute provides additional clarification of the package amount (For example, 3 mL, 10mL, etc.).

Identifies a particular constituent of interest in the product.

The ingredients need not be a complete list. If an ingredient is not specified, this does not indicate whether an ingredient is present or absent. If an ingredient is specified it does not mean that all ingredients are specified. It is possible to specify both inactive and active ingredients.

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

May be used to represent additional information that is not part of the basic definition of the element. 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 can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

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.

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 in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. 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 can 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.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

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.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

The actual ingredient - either a substance (simple ingredient) or another medication of a medication.

The ingredient may reference a substance (for example, amoxicillin) or another medication (for example in the case of a compounded product, Glaxal Base).

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

An Extension

STU3: Medication.ingredient.item[x]

Element Medication.ingredient.item[x] is mapped to FHIR R4B element Medication.ingredient.item[x] as SourceIsBroaderThanTarget. The standard extension alternate-reference has been mapped as the representation of FHIR STU3 element Medication.ingredient.item[x] with unmapped reference targets: Medication, Substance. Source element Medication.ingredient.item[x] has unmapped reference types. While the target element Medication.ingredient.item[x] is a choice type and does not allow extensions, the alternate-reference extension can be applied to Reference values within it.

Indication of whether this ingredient affects the therapeutic action of the drug.

True indicates that the ingredient affects the therapeutic action of the drug (i.e. active). False indicates that the ingredient does not affect the therapeutic action of the drug (i.e. inactive).

Specifies how many (or how much) of the items there are in this Medication. For example, 250 mg per tablet. This is expressed as a ratio where the numerator is 250mg and the denominator is 1 tablet.

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

An Extension

STU3: Medication.ingredient.amount additional types (Ratio) additional types from child elements (denominator, numerator)

Element Medication.ingredient.amount is mapped to FHIR R4B element Medication.ingredient.strength as SourceIsBroaderThanTarget. The mappings for Medication.ingredient.amount do not cover the following types: Ratio. The mappings for Medication.ingredient.amount do not cover the following types based on type expansion: denominator, numerator.

The value of the numerator.

The value of the denominator.

Information that only applies to packages (not products).

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

May be used to represent additional information that is not part of the basic definition of the element. 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 can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

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.

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 in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. 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 can 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.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

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.

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

The assigned lot number of a batch of the specified product.

When this specific batch of product will expire.