This page is part of the FHIR Specification (v4.5.0: R5 Preview #3). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R5 R4B R4 R3 R2

4.10 Resource ConceptMap - Content

Vocabulary

Work Group

Maturity Level: 1

Trial Use

Security Category: Anonymous

Compartments: Not linked to any defined compartments

A statement of relationships from one set of concepts to one or more other concepts - either concepts in code systems, or data element/data element concepts, or classes in class models.

4.10.1 Scope and Usage

A concept map defines a mapping from a set of concepts defined in a code system (commonly referred to as the "system") to one or more concepts defined in other code systems. In the mapping context, a system can be a typical code system based on a recognized standard or local terminology (in any of its forms), or in some cases it may be an "implicit" code system that is not based on a recognized terminology but still represents a set of "concepts" that can be usefully mapped. Mappings are one way - from the source to the target system. In many cases, the reverse mappings are valid, but this cannot be assumed to be the case.

Mappings between code system concepts are only intended to be defined in the context of a particular business usage. The business use case is normally defined by the specification of the source and target value sets. The mappings may be useful in other contexts, but this must be determined based on the context of use and meaning; it cannot be taken for granted automatically. An example where the usage context is important for choosing the correct mapping is mapping from a clinical terminology (e.g. SNOMED CT) to a classification (e.g. ICD-10) for either data analysis or billing. Mappings in the data analysis context would be targeted for an appropriate classification (often at a higher level), whereas in the billing context there may be specific requirements to be met (e.g. leaf level codes only) that could result in multiple mappings for a single source concept and then require additional information beyond the source concept itself in order to select the correct final mapping.

Note that all code systems (explicit or implicit) represented in FHIR have URI identifiers for value sets (also either explicit or implicit) that include the entire code system, and these "all codes" value sets can be used for mappings that are valid in all use contexts that are appropriate for the code system.

Each mapping for a concept from the source to target system includes a relationship property that specifies how similar the mapping is (or, in some cases, that there is no valid mapping). There is one element for each concept or field in the source value set or system that needs to be mapped. Each source concept may have multiple targets:

because there are multiple possible mappings (e.g., ambiguous)
to specify a correct map, and specify other mappings as invalid
when there are multiple mappings depending on the values of other elements (dependsOn)

There SHOULD be at least one target for each element, but some incomplete concept maps might not have a target for each concept.

A key concept for the ConceptMap resource is the $translate operation. This operation is a formal definition of an API by which a terminology server can allow clients to ask for a translation to be done based on the content in the ConceptMap resource. As such it also provides useful perspective on the operational use of ConceptMap resources in any context.

4.10.2 Boundaries and Relationships

While ConceptMap resources are not referred to directly from any other resource, they may be included and used in ImplementationGuide resources, and provide background knowledge that is useful in many contexts, including operations defined in this specification.

In addition to ConceptMap, there is also the StructureMap resource. The ConceptMap resource defines relationships between concepts in their own right, along with grading of their equivalencies, while the StructureMap defines an executable transform for instances that conform to a known structure.

Both Code System supplements and Concept Maps may be used to define relationships between concepts in different systems. ConceptMaps are assertions of the relationships between different concepts that are associated with particular contexts of use, while CodeSystem supplements are used to define inherent properties and semantics of the concepts in the code system

4.10.3 Background and Context

Further discussion of the issues involved in mapping between concept definition systems can be found in the HL7 v3 Core Principles document and the functionality described in the OMG CTS 2 specification.

4.10.4 References

This resource is referenced by itself.

This resource does not implement any patterns.

Structure

Name	Flags	Card.	Type	Description & Constraints
ConceptMap	TU		CanonicalResource	A map from one set of concepts to one or more other concepts + Warning: Name should be usable as an identifier for the module by machine processing applications such as code generation Elements defined in Ancestors: id, meta, implicitRules, language, text, contained, extension, modifierExtension, url, identifier, version, name, title, status, experimental, date, publisher, contact, description, useContext, jurisdiction, purpose, copyright
url	Σ	0..1	uri	Canonical identifier for this concept map, represented as a URI (globally unique)
identifier	Σ	0..1	Identifier	Additional identifier for the concept map
version	Σ	0..1	string	Business version of the concept map
name	Σ I	0..1	string	Name for this concept map (computer friendly)
title	Σ	0..1	string	Name for this concept map (human friendly)
status	?!Σ	1..1	code	draft \| active \| retired \| unknown PublicationStatus (Required)
experimental	Σ	0..1	boolean	For testing purposes, not real usage
date	Σ	0..1	dateTime	Date last changed
publisher	Σ	0..1	string	Name of the publisher (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description		0..1	markdown	Natural language description of the concept map
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
jurisdiction	Σ	0..*	CodeableConcept	Intended jurisdiction for concept map (if applicable) Jurisdiction (Extensible)
purpose		0..1	markdown	Why this concept map is defined
copyright		0..1	markdown	Use and/or publishing restrictions
source[x]	Σ	0..1		The source value set that contains the concepts that are being mapped
sourceUri			uri
sourceCanonical			canonical(ValueSet)
target[x]	Σ	0..1		The target value set which provides context for the mappings
targetUri			uri
targetCanonical			canonical(ValueSet)
group		0..*	BackboneElement	Same source and target systems
source		0..1	uri	Source system where concepts to be mapped are defined
sourceVersion		0..1	string	Specific version of the code system
target		0..1	uri	Target system that the concepts are to be mapped to
targetVersion		0..1	string	Specific version of the code system
element	I	1..*	BackboneElement	Mappings for a concept from the source set + Rule: If noMap is present, target SHALL NOT be present
code		0..1	code	Identifies element being mapped
display		0..1	string	Display for the code
noMap		0..1	boolean	No mapping to a target concept for this source concept
target	I	0..*	BackboneElement	Concept in target system for element + Rule: If the map is source-is-broader-than-target or not-related-to, there SHALL be some comments
code		0..1	code	Code that identifies the target element
display		0..1	string	Display for the code
relationship	?!	1..1	code	related-to \| equivalent \| source-is-narrower-than-target \| source-is-broader-than-target \| not-related-to ConceptMapRelationship (Required)
comment	I	0..1	string	Description of status/issues in mapping
dependsOn		0..*	BackboneElement	Other elements required for this mapping (from context)
property		1..1	uri	Reference to property mapping depends on
system		0..1	canonical(CodeSystem)	Code System (if necessary)
value		1..1	string	Value of the referenced element
display		0..1	string	Display for the code (if value is a code)
product		0..*	see dependsOn	Other concepts that this mapping also produces
unmapped	I	0..1	BackboneElement	What to do when there is no mapping target for the source concept + Rule: If the mode is 'fixed', a code must be provided + Rule: If the mode is 'other-map', a url must be provided
mode		1..1	code	provided \| fixed \| other-map ConceptMapGroupUnmappedMode (Required)
code		0..1	code	Fixed code when mode = fixed
display		0..1	string	Display for the code
url		0..1	canonical(ConceptMap)	canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped
Documentation for this format

UML Diagram (Legend)

XML Template

<ConceptMap xmlns="http://hl7.org/fhir"> 
 <!-- from Resource: id, meta, implicitRules, and language -->
 <url value="[uri]"/><!-- 0..1 Canonical identifier for this concept map, represented as a URI (globally unique) -->
 <identifier><!-- 0..1 Identifier Additional identifier for the concept map --></identifier>
 <version value="[string]"/><!-- 0..1 Business version of the concept map -->
 <name value="[string]"/><!--  0..1 Name for this concept map (computer friendly) -->
 <title value="[string]"/><!-- 0..1 Name for this concept map (human friendly) -->
 <status value="[code]"/><!-- 1..1 draft | active | retired | unknown -->
 <experimental value="[boolean]"/><!-- 0..1 For testing purposes, not real usage -->
 <date value="[dateTime]"/><!-- 0..1 Date last changed -->
 <publisher value="[string]"/><!-- 0..1 Name of the publisher (organization or individual) -->
 <contact><!-- 0..* ContactDetail Contact details for the publisher --></contact>
 <description value="[markdown]"/><!-- 0..1 Natural language description of the concept map -->
 <useContext><!-- 0..* UsageContext The context that the content is intended to support --></useContext>
 <jurisdiction><!-- 0..* CodeableConcept Intended jurisdiction for concept map (if applicable) --></jurisdiction>
 <purpose value="[markdown]"/><!-- 0..1 Why this concept map is defined -->
 <copyright value="[markdown]"/><!-- 0..1 Use and/or publishing restrictions -->
 <source[x]><!-- 0..1 uri|canonical(ValueSet) The source value set that contains the concepts that are being mapped --></source[x]>
 <target[x]><!-- 0..1 uri|canonical(ValueSet) The target value set which provides context for the mappings --></target[x]>
 <group>  <!-- 0..* Same source and target systems -->
  <source value="[uri]"/><!-- 0..1 Source system where concepts to be mapped are defined -->
  <sourceVersion value="[string]"/><!-- 0..1 Specific version of the  code system -->
  <target value="[uri]"/><!-- 0..1 Target system that the concepts are to be mapped to -->
  <targetVersion value="[string]"/><!-- 0..1 Specific version of the  code system -->
  <element>  <!-- 1..* Mappings for a concept from the source set -->
   <code value="[code]"/><!-- 0..1 Identifies element being mapped -->
   <display value="[string]"/><!-- 0..1 Display for the code -->
   <noMap value="[boolean]"/><!-- 0..1 No mapping to a target concept for this source concept -->
   <target>  <!-- 0..* Concept in target system for element -->
    <code value="[code]"/><!-- 0..1 Code that identifies the target element -->
    <display value="[string]"/><!-- 0..1 Display for the code -->
    <relationship value="[code]"/><!-- 1..1 related-to | equivalent | source-is-narrower-than-target | source-is-broader-than-target | not-related-to -->
    <comment value="[string]"/><!--  0..1 Description of status/issues in mapping -->
    <dependsOn>  <!-- 0..* Other elements required for this mapping (from context) -->
     <property value="[uri]"/><!-- 1..1 Reference to property mapping depends on -->
     <system><!-- 0..1 canonical(CodeSystem) Code System (if necessary) --></system>
     <value value="[string]"/><!-- 1..1 Value of the referenced element -->
     <display value="[string]"/><!-- 0..1 Display for the code (if value is a code) -->
    </dependsOn>
    <product><!-- 0..* Content as for ConceptMap.group.element.target.dependsOn Other concepts that this mapping also produces --></product>
   </target>
  </element>
  <unmapped>  <!-- 0..1 What to do when there is no mapping target for the source concept -->
   <mode value="[code]"/><!-- 1..1 provided | fixed | other-map -->
   <code value="[code]"/><!-- 0..1 Fixed code when mode = fixed -->
   <display value="[string]"/><!-- 0..1 Display for the code -->
   <url><!-- 0..1 canonical(ConceptMap) canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped --></url>
  </unmapped>
 </group>
</ConceptMap>

JSON Template

{
  "resourceType" : "ConceptMap",
  // from Resource: id, meta, implicitRules, and language
  "url" : "<uri>", // Canonical identifier for this concept map, represented as a URI (globally unique)
  "identifier" : { Identifier }, // Additional identifier for the concept map
  "version" : "<string>", // Business version of the concept map
  "name" : "<string>", // C? Name for this concept map (computer friendly)
  "title" : "<string>", // Name for this concept map (human friendly)
  "status" : "<code>", // R!  draft | active | retired | unknown
  "experimental" : <boolean>, // For testing purposes, not real usage
  "date" : "<dateTime>", // Date last changed
  "publisher" : "<string>", // Name of the publisher (organization or individual)
  "contact" : [{ ContactDetail }], // Contact details for the publisher
  "description" : "<markdown>", // Natural language description of the concept map
  "useContext" : [{ UsageContext }], // The context that the content is intended to support
  "jurisdiction" : [{ CodeableConcept }], // Intended jurisdiction for concept map (if applicable)
  "purpose" : "<markdown>", // Why this concept map is defined
  "copyright" : "<markdown>", // Use and/or publishing restrictions
  // source[x]: The source value set that contains the concepts that are being mapped. One of these 2:
  "sourceUri" : "<uri>",
  "sourceCanonical" : { canonical(ValueSet) },
  // target[x]: The target value set which provides context for the mappings. One of these 2:
  "targetUri" : "<uri>",
  "targetCanonical" : { canonical(ValueSet) },
  "group" : [{ // Same source and target systems
    "source" : "<uri>", // Source system where concepts to be mapped are defined
    "sourceVersion" : "<string>", // Specific version of the  code system
    "target" : "<uri>", // Target system that the concepts are to be mapped to
    "targetVersion" : "<string>", // Specific version of the  code system
    "element" : [{ // R!  Mappings for a concept from the source set
      "code" : "<code>", // Identifies element being mapped
      "display" : "<string>", // Display for the code
      "noMap" : <boolean>, // No mapping to a target concept for this source concept
      "target" : [{ // Concept in target system for element
        "code" : "<code>", // Code that identifies the target element
        "display" : "<string>", // Display for the code
        "relationship" : "<code>", // R!  related-to | equivalent | source-is-narrower-than-target | source-is-broader-than-target | not-related-to
        "comment" : "<string>", // C? Description of status/issues in mapping
        "dependsOn" : [{ // Other elements required for this mapping (from context)
          "property" : "<uri>", // R!  Reference to property mapping depends on
          "system" : { canonical(CodeSystem) }, // Code System (if necessary)
          "value" : "<string>", // R!  Value of the referenced element
          "display" : "<string>" // Display for the code (if value is a code)
        }],
        "product" : [{ Content as for ConceptMap.group.element.target.dependsOn }] // Other concepts that this mapping also produces
      }]
    }],
    "unmapped" : { // What to do when there is no mapping target for the source concept
      "mode" : "<code>", // R!  provided | fixed | other-map
      "code" : "<code>", // Fixed code when mode = fixed
      "display" : "<string>", // Display for the code
      "url" : { canonical(ConceptMap) } // canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped
    }
  }]
}

Turtle Template

@prefix fhir: <http://hl7.org/fhir/> .


[ a fhir:ConceptMap;
  fhir:nodeRole fhir:treeRoot; # if this is the parser root

  # from Resource: .id, .meta, .implicitRules, and .language
  fhir:ConceptMap.url [ uri ]; # 0..1 Canonical identifier for this concept map, represented as a URI (globally unique)
  fhir:ConceptMap.identifier [ Identifier ]; # 0..1 Additional identifier for the concept map
  fhir:ConceptMap.version [ string ]; # 0..1 Business version of the concept map
  fhir:ConceptMap.name [ string ]; # 0..1 Name for this concept map (computer friendly)
  fhir:ConceptMap.title [ string ]; # 0..1 Name for this concept map (human friendly)
  fhir:ConceptMap.status [ code ]; # 1..1 draft | active | retired | unknown
  fhir:ConceptMap.experimental [ boolean ]; # 0..1 For testing purposes, not real usage
  fhir:ConceptMap.date [ dateTime ]; # 0..1 Date last changed
  fhir:ConceptMap.publisher [ string ]; # 0..1 Name of the publisher (organization or individual)
  fhir:ConceptMap.contact [ ContactDetail ], ... ; # 0..* Contact details for the publisher
  fhir:ConceptMap.description [ markdown ]; # 0..1 Natural language description of the concept map
  fhir:ConceptMap.useContext [ UsageContext ], ... ; # 0..* The context that the content is intended to support
  fhir:ConceptMap.jurisdiction [ CodeableConcept ], ... ; # 0..* Intended jurisdiction for concept map (if applicable)
  fhir:ConceptMap.purpose [ markdown ]; # 0..1 Why this concept map is defined
  fhir:ConceptMap.copyright [ markdown ]; # 0..1 Use and/or publishing restrictions
  # ConceptMap.source[x] : 0..1 The source value set that contains the concepts that are being mapped. One of these 2
    fhir:ConceptMap.sourceUri [ uri ]
    fhir:ConceptMap.sourceCanonical [ canonical(ValueSet) ]
  # ConceptMap.target[x] : 0..1 The target value set which provides context for the mappings. One of these 2
    fhir:ConceptMap.targetUri [ uri ]
    fhir:ConceptMap.targetCanonical [ canonical(ValueSet) ]
  fhir:ConceptMap.group [ # 0..* Same source and target systems
    fhir:ConceptMap.group.source [ uri ]; # 0..1 Source system where concepts to be mapped are defined
    fhir:ConceptMap.group.sourceVersion [ string ]; # 0..1 Specific version of the  code system
    fhir:ConceptMap.group.target [ uri ]; # 0..1 Target system that the concepts are to be mapped to
    fhir:ConceptMap.group.targetVersion [ string ]; # 0..1 Specific version of the  code system
    fhir:ConceptMap.group.element [ # 1..* Mappings for a concept from the source set
      fhir:ConceptMap.group.element.code [ code ]; # 0..1 Identifies element being mapped
      fhir:ConceptMap.group.element.display [ string ]; # 0..1 Display for the code
      fhir:ConceptMap.group.element.noMap [ boolean ]; # 0..1 No mapping to a target concept for this source concept
      fhir:ConceptMap.group.element.target [ # 0..* Concept in target system for element
        fhir:ConceptMap.group.element.target.code [ code ]; # 0..1 Code that identifies the target element
        fhir:ConceptMap.group.element.target.display [ string ]; # 0..1 Display for the code
        fhir:ConceptMap.group.element.target.relationship [ code ]; # 1..1 related-to | equivalent | source-is-narrower-than-target | source-is-broader-than-target | not-related-to
        fhir:ConceptMap.group.element.target.comment [ string ]; # 0..1 Description of status/issues in mapping
        fhir:ConceptMap.group.element.target.dependsOn [ # 0..* Other elements required for this mapping (from context)
          fhir:ConceptMap.group.element.target.dependsOn.property [ uri ]; # 1..1 Reference to property mapping depends on
          fhir:ConceptMap.group.element.target.dependsOn.system [ canonical(CodeSystem) ]; # 0..1 Code System (if necessary)
          fhir:ConceptMap.group.element.target.dependsOn.value [ string ]; # 1..1 Value of the referenced element
          fhir:ConceptMap.group.element.target.dependsOn.display [ string ]; # 0..1 Display for the code (if value is a code)
        ], ...;
        fhir:ConceptMap.group.element.target.product [ See ConceptMap.group.element.target.dependsOn ], ... ; # 0..* Other concepts that this mapping also produces
      ], ...;
    ], ...;
    fhir:ConceptMap.group.unmapped [ # 0..1 What to do when there is no mapping target for the source concept
      fhir:ConceptMap.group.unmapped.mode [ code ]; # 1..1 provided | fixed | other-map
      fhir:ConceptMap.group.unmapped.code [ code ]; # 0..1 Fixed code when mode = fixed
      fhir:ConceptMap.group.unmapped.display [ string ]; # 0..1 Display for the code
      fhir:ConceptMap.group.unmapped.url [ canonical(ConceptMap) ]; # 0..1 canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped
    ];
  ], ...;
]

Changes since R3

ConceptMap

ConceptMap.status

Change value set from http://hl7.org/fhir/ValueSet/publication-status|4.0.0 to http://hl7.org/fhir/ValueSet/publication-status|4.5.0

ConceptMap.group.element.noMap

Added Element

ConceptMap.group.element.target.relationship

Added Mandatory Element

ConceptMap.group.unmapped.mode

Change value set from http://hl7.org/fhir/ValueSet/conceptmap-unmapped-mode|4.0.0 to http://hl7.org/fhir/ValueSet/conceptmap-unmapped-mode|4.5.0

ConceptMap.group.element.target.equivalence

deleted

See the Full Difference for further information

This analysis is available as XML or JSON.

See R3 <--> R4 Conversion Maps (status = 4 tests that all execute ok. All tests pass round-trip testing and 4 r3 resources are invalid (0 errors).)

Structure

Name	Flags	Card.	Type	Description & Constraints
ConceptMap	TU		CanonicalResource	A map from one set of concepts to one or more other concepts + Warning: Name should be usable as an identifier for the module by machine processing applications such as code generation Elements defined in Ancestors: id, meta, implicitRules, language, text, contained, extension, modifierExtension, url, identifier, version, name, title, status, experimental, date, publisher, contact, description, useContext, jurisdiction, purpose, copyright
url	Σ	0..1	uri	Canonical identifier for this concept map, represented as a URI (globally unique)
identifier	Σ	0..1	Identifier	Additional identifier for the concept map
version	Σ	0..1	string	Business version of the concept map
name	Σ I	0..1	string	Name for this concept map (computer friendly)
title	Σ	0..1	string	Name for this concept map (human friendly)
status	?!Σ	1..1	code	draft \| active \| retired \| unknown PublicationStatus (Required)
experimental	Σ	0..1	boolean	For testing purposes, not real usage
date	Σ	0..1	dateTime	Date last changed
publisher	Σ	0..1	string	Name of the publisher (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description		0..1	markdown	Natural language description of the concept map
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
jurisdiction	Σ	0..*	CodeableConcept	Intended jurisdiction for concept map (if applicable) Jurisdiction (Extensible)
purpose		0..1	markdown	Why this concept map is defined
copyright		0..1	markdown	Use and/or publishing restrictions
source[x]	Σ	0..1		The source value set that contains the concepts that are being mapped
sourceUri			uri
sourceCanonical			canonical(ValueSet)
target[x]	Σ	0..1		The target value set which provides context for the mappings
targetUri			uri
targetCanonical			canonical(ValueSet)
group		0..*	BackboneElement	Same source and target systems
source		0..1	uri	Source system where concepts to be mapped are defined
sourceVersion		0..1	string	Specific version of the code system
target		0..1	uri	Target system that the concepts are to be mapped to
targetVersion		0..1	string	Specific version of the code system
element	I	1..*	BackboneElement	Mappings for a concept from the source set + Rule: If noMap is present, target SHALL NOT be present
code		0..1	code	Identifies element being mapped
display		0..1	string	Display for the code
noMap		0..1	boolean	No mapping to a target concept for this source concept
target	I	0..*	BackboneElement	Concept in target system for element + Rule: If the map is source-is-broader-than-target or not-related-to, there SHALL be some comments
code		0..1	code	Code that identifies the target element
display		0..1	string	Display for the code
relationship	?!	1..1	code	related-to \| equivalent \| source-is-narrower-than-target \| source-is-broader-than-target \| not-related-to ConceptMapRelationship (Required)
comment	I	0..1	string	Description of status/issues in mapping
dependsOn		0..*	BackboneElement	Other elements required for this mapping (from context)
property		1..1	uri	Reference to property mapping depends on
system		0..1	canonical(CodeSystem)	Code System (if necessary)
value		1..1	string	Value of the referenced element
display		0..1	string	Display for the code (if value is a code)
product		0..*	see dependsOn	Other concepts that this mapping also produces
unmapped	I	0..1	BackboneElement	What to do when there is no mapping target for the source concept + Rule: If the mode is 'fixed', a code must be provided + Rule: If the mode is 'other-map', a url must be provided
mode		1..1	code	provided \| fixed \| other-map ConceptMapGroupUnmappedMode (Required)
code		0..1	code	Fixed code when mode = fixed
display		0..1	string	Display for the code
url		0..1	canonical(ConceptMap)	canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped
Documentation for this format

UML Diagram (Legend)

XML Template

<ConceptMap xmlns="http://hl7.org/fhir"> 
 <!-- from Resource: id, meta, implicitRules, and language -->
 <url value="[uri]"/><!-- 0..1 Canonical identifier for this concept map, represented as a URI (globally unique) -->
 <identifier><!-- 0..1 Identifier Additional identifier for the concept map --></identifier>
 <version value="[string]"/><!-- 0..1 Business version of the concept map -->
 <name value="[string]"/><!--  0..1 Name for this concept map (computer friendly) -->
 <title value="[string]"/><!-- 0..1 Name for this concept map (human friendly) -->
 <status value="[code]"/><!-- 1..1 draft | active | retired | unknown -->
 <experimental value="[boolean]"/><!-- 0..1 For testing purposes, not real usage -->
 <date value="[dateTime]"/><!-- 0..1 Date last changed -->
 <publisher value="[string]"/><!-- 0..1 Name of the publisher (organization or individual) -->
 <contact><!-- 0..* ContactDetail Contact details for the publisher --></contact>
 <description value="[markdown]"/><!-- 0..1 Natural language description of the concept map -->
 <useContext><!-- 0..* UsageContext The context that the content is intended to support --></useContext>
 <jurisdiction><!-- 0..* CodeableConcept Intended jurisdiction for concept map (if applicable) --></jurisdiction>
 <purpose value="[markdown]"/><!-- 0..1 Why this concept map is defined -->
 <copyright value="[markdown]"/><!-- 0..1 Use and/or publishing restrictions -->
 <source[x]><!-- 0..1 uri|canonical(ValueSet) The source value set that contains the concepts that are being mapped --></source[x]>
 <target[x]><!-- 0..1 uri|canonical(ValueSet) The target value set which provides context for the mappings --></target[x]>
 <group>  <!-- 0..* Same source and target systems -->
  <source value="[uri]"/><!-- 0..1 Source system where concepts to be mapped are defined -->
  <sourceVersion value="[string]"/><!-- 0..1 Specific version of the  code system -->
  <target value="[uri]"/><!-- 0..1 Target system that the concepts are to be mapped to -->
  <targetVersion value="[string]"/><!-- 0..1 Specific version of the  code system -->
  <element>  <!-- 1..* Mappings for a concept from the source set -->
   <code value="[code]"/><!-- 0..1 Identifies element being mapped -->
   <display value="[string]"/><!-- 0..1 Display for the code -->
   <noMap value="[boolean]"/><!-- 0..1 No mapping to a target concept for this source concept -->
   <target>  <!-- 0..* Concept in target system for element -->
    <code value="[code]"/><!-- 0..1 Code that identifies the target element -->
    <display value="[string]"/><!-- 0..1 Display for the code -->
    <relationship value="[code]"/><!-- 1..1 related-to | equivalent | source-is-narrower-than-target | source-is-broader-than-target | not-related-to -->
    <comment value="[string]"/><!--  0..1 Description of status/issues in mapping -->
    <dependsOn>  <!-- 0..* Other elements required for this mapping (from context) -->
     <property value="[uri]"/><!-- 1..1 Reference to property mapping depends on -->
     <system><!-- 0..1 canonical(CodeSystem) Code System (if necessary) --></system>
     <value value="[string]"/><!-- 1..1 Value of the referenced element -->
     <display value="[string]"/><!-- 0..1 Display for the code (if value is a code) -->
    </dependsOn>
    <product><!-- 0..* Content as for ConceptMap.group.element.target.dependsOn Other concepts that this mapping also produces --></product>
   </target>
  </element>
  <unmapped>  <!-- 0..1 What to do when there is no mapping target for the source concept -->
   <mode value="[code]"/><!-- 1..1 provided | fixed | other-map -->
   <code value="[code]"/><!-- 0..1 Fixed code when mode = fixed -->
   <display value="[string]"/><!-- 0..1 Display for the code -->
   <url><!-- 0..1 canonical(ConceptMap) canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped --></url>
  </unmapped>
 </group>
</ConceptMap>

JSON Template

{
  "resourceType" : "ConceptMap",
  // from Resource: id, meta, implicitRules, and language
  "url" : "<uri>", // Canonical identifier for this concept map, represented as a URI (globally unique)
  "identifier" : { Identifier }, // Additional identifier for the concept map
  "version" : "<string>", // Business version of the concept map
  "name" : "<string>", // C? Name for this concept map (computer friendly)
  "title" : "<string>", // Name for this concept map (human friendly)
  "status" : "<code>", // R!  draft | active | retired | unknown
  "experimental" : <boolean>, // For testing purposes, not real usage
  "date" : "<dateTime>", // Date last changed
  "publisher" : "<string>", // Name of the publisher (organization or individual)
  "contact" : [{ ContactDetail }], // Contact details for the publisher
  "description" : "<markdown>", // Natural language description of the concept map
  "useContext" : [{ UsageContext }], // The context that the content is intended to support
  "jurisdiction" : [{ CodeableConcept }], // Intended jurisdiction for concept map (if applicable)
  "purpose" : "<markdown>", // Why this concept map is defined
  "copyright" : "<markdown>", // Use and/or publishing restrictions
  // source[x]: The source value set that contains the concepts that are being mapped. One of these 2:
  "sourceUri" : "<uri>",
  "sourceCanonical" : { canonical(ValueSet) },
  // target[x]: The target value set which provides context for the mappings. One of these 2:
  "targetUri" : "<uri>",
  "targetCanonical" : { canonical(ValueSet) },
  "group" : [{ // Same source and target systems
    "source" : "<uri>", // Source system where concepts to be mapped are defined
    "sourceVersion" : "<string>", // Specific version of the  code system
    "target" : "<uri>", // Target system that the concepts are to be mapped to
    "targetVersion" : "<string>", // Specific version of the  code system
    "element" : [{ // R!  Mappings for a concept from the source set
      "code" : "<code>", // Identifies element being mapped
      "display" : "<string>", // Display for the code
      "noMap" : <boolean>, // No mapping to a target concept for this source concept
      "target" : [{ // Concept in target system for element
        "code" : "<code>", // Code that identifies the target element
        "display" : "<string>", // Display for the code
        "relationship" : "<code>", // R!  related-to | equivalent | source-is-narrower-than-target | source-is-broader-than-target | not-related-to
        "comment" : "<string>", // C? Description of status/issues in mapping
        "dependsOn" : [{ // Other elements required for this mapping (from context)
          "property" : "<uri>", // R!  Reference to property mapping depends on
          "system" : { canonical(CodeSystem) }, // Code System (if necessary)
          "value" : "<string>", // R!  Value of the referenced element
          "display" : "<string>" // Display for the code (if value is a code)
        }],
        "product" : [{ Content as for ConceptMap.group.element.target.dependsOn }] // Other concepts that this mapping also produces
      }]
    }],
    "unmapped" : { // What to do when there is no mapping target for the source concept
      "mode" : "<code>", // R!  provided | fixed | other-map
      "code" : "<code>", // Fixed code when mode = fixed
      "display" : "<string>", // Display for the code
      "url" : { canonical(ConceptMap) } // canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped
    }
  }]
}

Turtle Template

@prefix fhir: <http://hl7.org/fhir/> .


[ a fhir:ConceptMap;
  fhir:nodeRole fhir:treeRoot; # if this is the parser root

  # from Resource: .id, .meta, .implicitRules, and .language
  fhir:ConceptMap.url [ uri ]; # 0..1 Canonical identifier for this concept map, represented as a URI (globally unique)
  fhir:ConceptMap.identifier [ Identifier ]; # 0..1 Additional identifier for the concept map
  fhir:ConceptMap.version [ string ]; # 0..1 Business version of the concept map
  fhir:ConceptMap.name [ string ]; # 0..1 Name for this concept map (computer friendly)
  fhir:ConceptMap.title [ string ]; # 0..1 Name for this concept map (human friendly)
  fhir:ConceptMap.status [ code ]; # 1..1 draft | active | retired | unknown
  fhir:ConceptMap.experimental [ boolean ]; # 0..1 For testing purposes, not real usage
  fhir:ConceptMap.date [ dateTime ]; # 0..1 Date last changed
  fhir:ConceptMap.publisher [ string ]; # 0..1 Name of the publisher (organization or individual)
  fhir:ConceptMap.contact [ ContactDetail ], ... ; # 0..* Contact details for the publisher
  fhir:ConceptMap.description [ markdown ]; # 0..1 Natural language description of the concept map
  fhir:ConceptMap.useContext [ UsageContext ], ... ; # 0..* The context that the content is intended to support
  fhir:ConceptMap.jurisdiction [ CodeableConcept ], ... ; # 0..* Intended jurisdiction for concept map (if applicable)
  fhir:ConceptMap.purpose [ markdown ]; # 0..1 Why this concept map is defined
  fhir:ConceptMap.copyright [ markdown ]; # 0..1 Use and/or publishing restrictions
  # ConceptMap.source[x] : 0..1 The source value set that contains the concepts that are being mapped. One of these 2
    fhir:ConceptMap.sourceUri [ uri ]
    fhir:ConceptMap.sourceCanonical [ canonical(ValueSet) ]
  # ConceptMap.target[x] : 0..1 The target value set which provides context for the mappings. One of these 2
    fhir:ConceptMap.targetUri [ uri ]
    fhir:ConceptMap.targetCanonical [ canonical(ValueSet) ]
  fhir:ConceptMap.group [ # 0..* Same source and target systems
    fhir:ConceptMap.group.source [ uri ]; # 0..1 Source system where concepts to be mapped are defined
    fhir:ConceptMap.group.sourceVersion [ string ]; # 0..1 Specific version of the  code system
    fhir:ConceptMap.group.target [ uri ]; # 0..1 Target system that the concepts are to be mapped to
    fhir:ConceptMap.group.targetVersion [ string ]; # 0..1 Specific version of the  code system
    fhir:ConceptMap.group.element [ # 1..* Mappings for a concept from the source set
      fhir:ConceptMap.group.element.code [ code ]; # 0..1 Identifies element being mapped
      fhir:ConceptMap.group.element.display [ string ]; # 0..1 Display for the code
      fhir:ConceptMap.group.element.noMap [ boolean ]; # 0..1 No mapping to a target concept for this source concept
      fhir:ConceptMap.group.element.target [ # 0..* Concept in target system for element
        fhir:ConceptMap.group.element.target.code [ code ]; # 0..1 Code that identifies the target element
        fhir:ConceptMap.group.element.target.display [ string ]; # 0..1 Display for the code
        fhir:ConceptMap.group.element.target.relationship [ code ]; # 1..1 related-to | equivalent | source-is-narrower-than-target | source-is-broader-than-target | not-related-to
        fhir:ConceptMap.group.element.target.comment [ string ]; # 0..1 Description of status/issues in mapping
        fhir:ConceptMap.group.element.target.dependsOn [ # 0..* Other elements required for this mapping (from context)
          fhir:ConceptMap.group.element.target.dependsOn.property [ uri ]; # 1..1 Reference to property mapping depends on
          fhir:ConceptMap.group.element.target.dependsOn.system [ canonical(CodeSystem) ]; # 0..1 Code System (if necessary)
          fhir:ConceptMap.group.element.target.dependsOn.value [ string ]; # 1..1 Value of the referenced element
          fhir:ConceptMap.group.element.target.dependsOn.display [ string ]; # 0..1 Display for the code (if value is a code)
        ], ...;
        fhir:ConceptMap.group.element.target.product [ See ConceptMap.group.element.target.dependsOn ], ... ; # 0..* Other concepts that this mapping also produces
      ], ...;
    ], ...;
    fhir:ConceptMap.group.unmapped [ # 0..1 What to do when there is no mapping target for the source concept
      fhir:ConceptMap.group.unmapped.mode [ code ]; # 1..1 provided | fixed | other-map
      fhir:ConceptMap.group.unmapped.code [ code ]; # 0..1 Fixed code when mode = fixed
      fhir:ConceptMap.group.unmapped.display [ string ]; # 0..1 Display for the code
      fhir:ConceptMap.group.unmapped.url [ canonical(ConceptMap) ]; # 0..1 canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped
    ];
  ], ...;
]

Changes since Release 3

ConceptMap

ConceptMap.status

Change value set from http://hl7.org/fhir/ValueSet/publication-status|4.0.0 to http://hl7.org/fhir/ValueSet/publication-status|4.5.0

ConceptMap.group.element.noMap

Added Element

ConceptMap.group.element.target.relationship

Added Mandatory Element

ConceptMap.group.unmapped.mode

Change value set from http://hl7.org/fhir/ValueSet/conceptmap-unmapped-mode|4.0.0 to http://hl7.org/fhir/ValueSet/conceptmap-unmapped-mode|4.5.0

ConceptMap.group.element.target.equivalence

deleted

See the Full Difference for further information

This analysis is available as XML or JSON.

See R3 <--> R4 Conversion Maps (status = 4 tests that all execute ok. All tests pass round-trip testing and 4 r3 resources are invalid (0 errors).)

See the Profiles & Extensions and the alternate definitions: Master Definition XML + JSON, XML Schema/Schematron + JSON Schema, ShEx (for Turtle) , the spreadsheet version & the dependency analysis a

4.10.5.1 Terminology Bindings

Path	Definition	Type	Reference
ConceptMap.status	The lifecycle status of an artifact.	Required	PublicationStatus
ConceptMap.jurisdiction	Countries and regions within which this artifact is targeted for use.	Extensible	Jurisdiction ValueSet
ConceptMap.group.element.target.relationship	The relationship between concepts.	Required	ConceptMapRelationship
ConceptMap.group.unmapped.mode	Defines which action to take if there is no match in the group.	Required	ConceptMapGroupUnmappedMode

Path

Definition

Type

Reference

ConceptMap.status

The lifecycle status of an artifact.

Required

PublicationStatus

ConceptMap.jurisdiction

Countries and regions within which this artifact is targeted for use.

Extensible

Jurisdiction ValueSet

ConceptMap.group.element.target.relationship

The relationship between concepts.

Required

ConceptMapRelationship

ConceptMap.group.unmapped.mode

Defines which action to take if there is no match in the group.

Required

ConceptMapGroupUnmappedMode

4.10.5.2 Constraints

Level

Location

Description

Expression

cnl-0

Warning

(base)

Name should be usable as an identifier for the module by machine processing applications such as code generation

name.matches('[A-Z]([A-Za-z0-9_]){0,254}')

cmd-1

Rule

ConceptMap.group.element.target

If the map is source-is-broader-than-target or not-related-to, there SHALL be some comments

comment.exists() or relationship.empty() or ((relationship != 'source-is-broader-than-target') and (relationship != 'not-related-to'))

cmd-2

Rule

ConceptMap.group.unmapped

If the mode is 'fixed', a code must be provided

(mode = 'fixed') implies code.exists()

cmd-3

Rule

ConceptMap.group.unmapped

If the mode is 'other-map', a url must be provided

(mode = 'other-map') implies url.exists()

cmd-4

Rule

ConceptMap.group.element

If noMap is present, target SHALL NOT be present

(noMap.exists() and target.empty()) or noMap.empty()

4.10.6 Notes

The value of the system, version and code elements are the same as used by the Coding data type
When a mapping relationship is characterized as "source-is-broader-than-target", some explanation of the scope difference SHALL be provided in the comments
The concept map is a statement of mapping in a single direction. The existence of a matching mapping in the reverse direction cannot be assumed to exist automatically, but only through human review.
For simplicity, it is better if is only one element for each source concept. if there is more than one, then just as one element can have multiple targets, multiple occurrences of element with the same element.code simply aggregate their target elements as if there was only one element

4.10.7 Grouping Mappings

The concept mappings in element are arranged into groups that share common source/target systems. These groups have no semantic significance; they exist to make the representation more concise. Concept maps may contain more than one group with the same source and target - this would be a less concise representation but may be useful in order to maintain a fixed order for the concepts that are mapped.

Concepts that are labeled as 'unmatched' are considered to be unmatched in the target value set, irrespective of whether they are contained in a group with a stated target system or not. Groups that contain no target system may only contained 'unmatched' concepts. There is no difference in the meaning of an unmatched target whether or not there is a stated target system.

4.10.8 Mapping Dependencies

In the simple case, a mapping is made from one code to another. E.g. from "home address" in one code system to "address - home" in another. But in other cases, the mapping is not a simple one to one mapping. A typical example might be mapping between a radiology imaging request that has 2 elements: modality, and body site, and another radiology imaging request that pre-coordinates both of these into a single code modality+body site. In this case, it is not possible to map from one code to another. Instead, the mapping might contain entries like this:

Source Concept

DependsOn.property

DependsOn Concept

Target Concept

X-Ray

Bodysite

Chest

Chest-XRay

When attempting to translate the source to the target, an application must also provide a value for the element identified in dependsOn.property so that the correct mapping can be performed. To support the reverse operation, product is the converse, and works in reverse.

To see a real example of a mapping with dependencies, check the Specimen Type Mapping.

4.10.9 Handling Unmapped Codes

If there is no explicit mapping for a code - that is, the engine processing the ConceptMap finds a group with a matching source system, but not matching element for the code it is translating, processing proceeds to the unmapped element that specifies what should happen.

The unmapped element can specify one of the following different actions to take if there is no mapping for a concept:

provided Use the code source as provided in the $translate request. This is especially useful for translations between versions of the same code system, where only a few codes have changed

fixed Use the code (and display) explicitly provided in the group.unmapped. This is useful when there's a fall back general code - especially for classifications

other-map Use the map identified by the canonical URL in url. This is useful when a published concept map needs to be varied for a few specific cases on an institutional bass - the institution can create a simple concept that expresses their special cases, and then refer to the general purpose mappings

Note that this element is not used when there is an element with a matching code value, and a relationship value of not-related-to.

4.10.10 Implicit Code Systems

The ConceptMap resource is intended to map between concepts defined in a code system. It can also be useful to use the ConceptMap resource to define relationships between concepts defined in other kinds of resources. Here are some common kind of conceptual maps:

Between two elements in different structure definitions (e.g. between CDA and FHIR v2)
Between a code system and a Medication resource

Though these resources are not explicitly defining code systems, they do define 'concept's that can still usefully be treated as code systems for the sake of subsetting (e.g. ValueSet) and defining relationships (e.g. ConceptMap). See Implicit Code Systems for further information.

Note that this is different from StructureMap because that is intended to define an executional transform between structures, not a conceptual model.

4.10.11 Search Parameters

Search parameters for this resource. The common parameters also apply. See Searching for more information about searching in REST, messaging, and services.

Name	Type	Description	Expression	In Common
context	token	A use context assigned to the concept map	(ConceptMap.useContext.value as CodeableConcept)
context-quantity	quantity	A quantity- or range-valued use context assigned to the concept map	(ConceptMap.useContext.value as Quantity) \| (ConceptMap.useContext.value as Range)
context-type	token	A type of use context assigned to the concept map	ConceptMap.useContext.code
context-type-quantity	composite	A use context type and quantity- or range-based value assigned to the concept map	On ConceptMap.useContext: context-type: code context-quantity: value.as(Quantity) \| value.as(Range)
context-type-value	composite	A use context type and value assigned to the concept map	On ConceptMap.useContext: context-type: code context: value.as(CodeableConcept)
date N	date	The concept map publication date	ConceptMap.date
dependson N	uri	Reference to property mapping depends on	ConceptMap.group.element.target.dependsOn.property
description N	string	The description of the concept map	ConceptMap.description
identifier	token	External identifier for the concept map	ConceptMap.identifier
jurisdiction	token	Intended jurisdiction for the concept map	ConceptMap.jurisdiction
name N	string	Computationally friendly name of the concept map	ConceptMap.name
other N	reference	canonical reference to an additional ConceptMap to use for mapping if the source concept is unmapped	ConceptMap.group.unmapped.url (ConceptMap)
product N	uri	Reference to property mapping depends on	ConceptMap.group.element.target.product.property
publisher N	string	Name of the publisher of the concept map	ConceptMap.publisher
source	reference	The source value set that contains the concepts that are being mapped	(ConceptMap.source as canonical) (ValueSet)
source-code N	token	Identifies element being mapped	ConceptMap.group.element.code
source-system N	uri	Source system where concepts to be mapped are defined	ConceptMap.group.source
source-uri	reference	The source value set that contains the concepts that are being mapped	(ConceptMap.source as uri) (ValueSet)
status N	token	The current status of the concept map	ConceptMap.status
target	reference	The target value set which provides context for the mappings	(ConceptMap.target as canonical) (ValueSet)
target-code N	token	Code that identifies the target element	ConceptMap.group.element.target.code
target-system N	uri	Target system that the concepts are to be mapped to	ConceptMap.group.target
target-uri	reference	The target value set which provides context for the mappings	(ConceptMap.target as uri) (ValueSet)
title N	string	The human-friendly name of the concept map	ConceptMap.title
url N	uri	The uri that identifies the concept map	ConceptMap.url
version N	token	The business version of the concept map	ConceptMap.version