FHIR Extensions Pack v5.3.0 (2026-05-16)

This page is part of the FHIR Core Extensions Registry (v5.3.0: Release 5.3) based on FHIR (HL7® FHIR® Standard) v5.0.0. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

4.8.51 Resource CodeSystem - Extensions

Terminology Infrastructure Work GroupMaturity Level: N/AStandards Status: InformativeSecurity Category: N/A Compartments: N/A

This table lists extensions for the CodeSystem resource defined in association with the core specification. For background information, see Extensibility. Additional extensions may be found in published Implementation Guides and in the Conformance resource registry .

Identity Card. Type Context WG Status Δ v5.2.0
Extensions defined for the CodeSystem resource
artifact-approvalDate 0..1 date ActorDefinition , CapabilityStatement , ClinicalUseDefinition , CodeSystem ,
CompartmentDefinition , Composition , ConditionDefinition , ConceptMap ,
DeviceDefinition , ExampleScenario , GraphDefinition , Group , ImplementationGuide ,
Medication , MedicationKnowledge , MessageDefinition , NamingSystem ,
ObservationDefinition , OperationDefinition , Requirements , ResearchStudy ,
SearchParameter , SpecimenDefinition , Substance , SubstanceDefinition ,
SubscriptionTopic , StructureDefinition , StructureMap , TerminologyCapabilities ,
TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM1 icon Changed:
artifact-author 0..* ContactDetail ActorDefinition , CapabilityStatement , ClinicalUseDefinition , CodeSystem ,
CompartmentDefinition , ConditionDefinition , ConceptMap , DeviceDefinition ,
ExampleScenario , GraphDefinition , Group , ImplementationGuide , Medication ,
MedicationKnowledge , MessageDefinition , NamingSystem , ObservationDefinition ,
OperationDefinition , Questionnaire , Requirements , ResearchStudy , SearchParameter ,
SpecimenDefinition , Substance , SubstanceDefinition , SubscriptionTopic ,
StructureDefinition , StructureMap , TerminologyCapabilities , TestPlan ,
TestScript , ValueSet 		cds Trial-Use : FMM2 icon Changed:
artifact-citeAs 0..1 (Choice) ActivityDefinition , ActorDefinition , CapabilityStatement , ClinicalUseDefinition ,
CodeSystem , CompartmentDefinition , Composition , ConditionDefinition ,
ConceptMap , DeviceDefinition , ExampleScenario , EventDefinition , EvidenceVariable ,
GraphDefinition , Group , ImplementationGuide , Library , Measure , Medication ,
MedicationKnowledge , MessageDefinition , NamingSystem , ObservationDefinition ,
OperationDefinition , PlanDefinition , Questionnaire , Requirements ,
ResearchStudy , SearchParameter , SpecimenDefinition , Substance , SubstanceDefinition ,
SubscriptionTopic , StructureDefinition , StructureMap , TerminologyCapabilities ,
TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM1 n/c
artifact-copyrightLabel 0..1 string ActivityDefinition , ArtifactAssessment , CapabilityStatement , ClinicalUseDefinition ,
CodeSystem , CompartmentDefinition , Composition , ConditionDefinition ,
ConceptMap , DeviceDefinition , EventDefinition , Evidence , EvidenceVariable ,
ExampleScenario , GraphDefinition , Group , ImplementationGuide , Library ,
Measure , Medication , MedicationKnowledge , MessageDefinition , NamingSystem ,
ObservationDefinition , OperationDefinition , PlanDefinition , Questionnaire ,
ResearchStudy , SearchParameter , SpecimenDefinition , Substance , SubstanceDefinition ,
SubscriptionTopic , StructureDefinition , StructureMap , TerminologyCapabilities ,
TestScript , ValueSet 		cds Draft : FMM1 icon Changed:
artifact-editor 0..* ContactDetail ActorDefinition , ArtifactAssessment , CapabilityStatement , Composition ,
ClinicalUseDefinition , CodeSystem , CompartmentDefinition , ConditionDefinition ,
ConceptMap , DeviceDefinition , ExampleScenario , GraphDefinition , Group ,
ImplementationGuide , Medication , MedicationKnowledge , MessageDefinition ,
NamingSystem , ObservationDefinition , OperationDefinition , Questionnaire ,
Requirements , ResearchStudy , SearchParameter , SpecimenDefinition ,
Substance , SubstanceDefinition , SubscriptionTopic , StructureDefinition ,
StructureMap , TerminologyCapabilities , TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM2 icon Changed:
artifact-effectivePeriod 0..1 Period ActorDefinition , ArtifactAssessment , CapabilityStatement , ClinicalUseDefinition ,
CodeSystem , CompartmentDefinition , Composition , ConditionDefinition ,
ConceptMap , DeviceDefinition , Evidence , ExampleScenario , GraphDefinition ,
Group , ImplementationGuide , Medication , MedicationKnowledge , MessageDefinition ,
NamingSystem , ObservationDefinition , OperationDefinition , Requirements ,
ResearchStudy , SearchParameter , SpecimenDefinition , Substance , SubstanceDefinition ,
SubscriptionTopic , StructureDefinition , StructureMap , TerminologyCapabilities ,
TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM1 icon Changed:
artifact-endorser 0..* ContactDetail ActorDefinition , ArtifactAssessment , CapabilityStatement , ClinicalUseDefinition ,
CodeSystem , CompartmentDefinition , Composition , ConditionDefinition ,
ConceptMap , DeviceDefinition , ExampleScenario , GraphDefinition , Group ,
ImplementationGuide , Medication , MedicationKnowledge , MessageDefinition ,
NamingSystem , ObservationDefinition , OperationDefinition , Questionnaire ,
Requirements , ResearchStudy , SearchParameter , SpecimenDefinition ,
Substance , SubstanceDefinition , SubscriptionTopic , StructureDefinition ,
StructureMap , TerminologyCapabilities , TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM2 icon Changed:
artifact-lastReviewDate 0..1 date ActorDefinition , CapabilityStatement , ClinicalUseDefinition , CodeSystem ,
CompartmentDefinition , Composition , ConditionDefinition , ConceptMap ,
DeviceDefinition , ExampleScenario , GraphDefinition , Group , ImplementationGuide ,
Medication , MedicationKnowledge , MessageDefinition , NamingSystem ,
ObservationDefinition , OperationDefinition , Requirements , ResearchStudy ,
SearchParameter , SpecimenDefinition , Substance , SubstanceDefinition ,
SubscriptionTopic , StructureDefinition , StructureMap , TerminologyCapabilities ,
TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM1 icon Changed:
artifact-publicationDate 0..1 date Composition , Group , Medication , Substance , ResearchStudy , ArtifactAssessment ,
ActivityDefinition , ChargeItemDefinition , Citation , CodeSystem , ConceptMap ,
ConditionDefinition , EventDefinition , Evidence , EvidenceVariable ,
Library , Measure , NamingSystem , ObservationDefinition , PlanDefinition ,
Questionnaire , SpecimenDefinition , ValueSet 		cds Trial-Use : FMM3 icon Added:
artifact-relatedArtifact 0..* RelatedArtifact CapabilityStatement , ClinicalUseDefinition , CodeSystem , CompartmentDefinition ,
Composition , ConditionDefinition , ConceptMap , Device.conformsTo , DeviceDefinition ,
ExampleScenario , GraphDefinition , Group , ImplementationGuide , Medication ,
MedicationKnowledge , MessageDefinition , NamingSystem , ObservationDefinition ,
OperationDefinition , Questionnaire , SearchParameter , SpecimenDefinition ,
Substance , SubstanceDefinition , SubscriptionTopic , StructureDefinition ,
StructureMap , TerminologyCapabilities , ValueSet 		cds Trial-Use : FMM2 icon Changed:
artifact-releaseDescription 0..1 markdown ActorDefinition , ArtifactAssessment , ActivityDefinition , CapabilityStatement ,
ClinicalUseDefinition , CodeSystem , CompartmentDefinition , Composition ,
ConditionDefinition , ConceptMap , DeviceDefinition , EventDefinition ,
Evidence , EvidenceVariable , ExampleScenario , GraphDefinition , Group ,
ImplementationGuide , Library , Measure , Medication , MedicationKnowledge ,
MessageDefinition , NamingSystem , ObservationDefinition , OperationDefinition ,
PlanDefinition , Questionnaire , Requirements , ResearchStudy , SearchParameter ,
SpecimenDefinition , Substance , SubstanceDefinition , SubscriptionTopic ,
StructureDefinition , StructureMap , TerminologyCapabilities , TestPlan ,
TestScript , ValueSet 		cds Trial-Use : FMM1 n/c
artifact-releaseLabel 0..1 string ActorDefinition , ArtifactAssessment , ActivityDefinition , CapabilityStatement ,
ClinicalUseDefinition , CodeSystem , CompartmentDefinition , Composition ,
ConditionDefinition , ConceptMap , DeviceDefinition , EventDefinition ,
Evidence , EvidenceVariable , ExampleScenario , GraphDefinition , Group ,
ImplementationGuide , Library , Measure , Medication , MedicationKnowledge ,
MessageDefinition , NamingSystem , ObservationDefinition , OperationDefinition ,
PlanDefinition , Questionnaire , Requirements , ResearchStudy , SearchParameter ,
SpecimenDefinition , Substance , SubstanceDefinition , SubscriptionTopic ,
StructureDefinition , StructureMap , TerminologyCapabilities , TestPlan ,
TestScript , ValueSet 		cds Trial-Use : FMM1 n/c
artifact-reviewer 0..* ContactDetail ActorDefinition , ArtifactAssessment , CapabilityStatement , ClinicalUseDefinition ,
CodeSystem , CompartmentDefinition , Composition , ConditionDefinition ,
ConceptMap , DeviceDefinition , ExampleScenario , GraphDefinition , Group ,
ImplementationGuide , Medication , MedicationKnowledge , MessageDefinition ,
NamingSystem , ObservationDefinition , OperationDefinition , Questionnaire ,
Requirements , ResearchStudy , SearchParameter , SpecimenDefinition ,
Substance , SubstanceDefinition , SubscriptionTopic , StructureDefinition ,
StructureMap , TerminologyCapabilities , TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM2 icon Changed:
artifact-topic 0..* CodeableConcept ArtifactAssessment , CapabilityStatement , ClinicalUseDefinition , CodeSystem ,
CompartmentDefinition , ConditionDefinition , ConceptMap , DeviceDefinition ,
ExampleScenario , GraphDefinition , Group , ImplementationGuide , Medication ,
MedicationKnowledge , MessageDefinition , NamingSystem , ObservationDefinition ,
OperationDefinition , Questionnaire , SearchParameter , SpecimenDefinition ,
Substance , SubstanceDefinition , SubscriptionTopic , StructureDefinition ,
StructureMap , TerminologyCapabilities , ValueSet 		cds Trial-Use : FMM2 icon Changed:
artifact-usage 0..1 markdown ActorDefinition , ArtifactAssessment , CapabilityStatement , ClinicalUseDefinition ,
CodeSystem , CompartmentDefinition , Composition , ConditionDefinition ,
ConceptMap , DeviceDefinition , Evidence , EvidenceVariable , ExampleScenario ,
GraphDefinition , Group , ImplementationGuide , Medication , MedicationKnowledge ,
MessageDefinition , ObservationDefinition , OperationDefinition , Questionnaire ,
Requirements , ResearchStudy , SearchParameter , SpecimenDefinition ,
Substance , SubstanceDefinition , SubscriptionTopic , StructureDefinition ,
StructureMap , TerminologyCapabilities , TestPlan , TestScript , ValueSet 		cds Trial-Use : FMM1 n/c
artifact-versionAlgorithm 0..1 (Choice) ArtifactAssessment , ActivityDefinition , CapabilityStatement , ClinicalUseDefinition ,
CodeSystem , CompartmentDefinition , Composition , ConditionDefinition ,
ConceptMap , DeviceDefinition , ExampleScenario , GraphDefinition , Group ,
ImplementationGuide , Library , Measure , Medication , MedicationKnowledge ,
MessageDefinition , NamingSystem , ObservationDefinition , OperationDefinition ,
PlanDefinition , Questionnaire , ResearchStudy , SearchParameter , SpecimenDefinition ,
Substance , SubstanceDefinition , SubscriptionTopic , StructureDefinition ,
StructureMap , TerminologyCapabilities , ValueSet 		cds Draft : FMM1 icon Changed:
artifact-versionPolicy 0..1 CodeableConcept ActivityDefinition , ActorDefinition , ArtifactAssessment , CapabilityStatement ,
ClinicalUseDefinition , CodeSystem , CompartmentDefinition , Composition ,
ConditionDefinition , ConceptMap , DeviceDefinition , EventDefinition ,
Evidence , EvidenceVariable , ExampleScenario , GraphDefinition , Group ,
ImplementationGuide , Library , Measure , Medication , MedicationKnowledge ,
MessageDefinition , NamingSystem , ObservationDefinition , OperationDefinition ,
PlanDefinition , Questionnaire , Requirements , ResearchStudy , SearchParameter ,
SpecimenDefinition , Substance , SubstanceDefinition , SubscriptionTopic ,
StructureDefinition , StructureMap , TerminologyCapabilities , TestPlan ,
TestScript , ValueSet 		cds Trial-Use : FMM1 n/c
codesystem-alternate 0..* (complex) CodeSystem.concept vocab Trial-Use : FMM3 n/c
codesystem-author 0..* string CodeSystem vocab Deprecated : FMM1 n/c
codesystem-authoritativeSource 0..1 uri CodeSystem vocab Deprecated : FMM2 icon Changed:
codesystem-concept-comments 0..1 string CodeSystem.concept vocab Trial-Use : FMM3 icon Changed:
codesystem-conceptOrder 0..1 integer CodeSystem.concept vocab Trial-Use : FMM3 icon Changed:
codesystem-effectiveDate 0..1 date CodeSystem vocab Deprecated : FMM1 n/c
codesystem-expirationDate 0..1 date CodeSystem vocab Deprecated : FMM1 n/c
codesystem-globalLangPack 0..1 boolean CodeSystem vocab Trial-Use : FMM1 icon Added:
codesystem-history 0..* (complex) CodeSystem vocab Deprecated : FMM3 icon Changed:
codesystem-keyWord 0..* string CodeSystem vocab Trial-Use : FMM3 icon Changed:
codesystem-label 0..1 string CodeSystem.concept vocab Trial-Use : FMM3 n/c
codesystem-map 0..1 canonical CodeSystem vocab Trial-Use : FMM3 n/c
codesystem-otherName 0..* (complex) CodeSystem vocab Deprecated : FMM3 icon Changed:
codesystem-properties-mode 0..1 code CodeSystem vocab Trial-Use : FMM2 icon Changed:
codesystem-property-valueset 0..1 canonical CodeSystem.property vocab Trial-Use : FMM1 icon Changed:
codesystem-replacedby 0..1 Coding CodeSystem.concept vocab Trial-Use : FMM3 icon Changed:
codesystem-sourceReference 0..1 uri CodeSystem vocab Deprecated : FMM3 icon Changed:
codesystem-trusted-expansion 0..* uri CodeSystem vocab Trial-Use : FMM3 n/c
codesystem-usage 0..* (complex) CodeSystem vocab Trial-Use : FMM3 n/c
codesystem-use-markdown 0..1 boolean CodeSystem vocab Deprecated : FMM2 icon Changed:
codesystem-warning 0..1 markdown CodeSystem vocab Trial-Use : FMM3 n/c
codesystem-workflowStatus 0..1 string CodeSystem vocab Deprecated : FMM3 icon Changed:
coding-sctdescid 0..1 id Coding , CodeSystem.concept.display , CodeSystem.concept.designation ,
ValueSet.expansion.contains.display , ValueSet.expansion.contains.designation 		fhir Trial-Use : FMM3 n/c
ordinalValue 0..1 decimal Coding , Questionnaire.item.answerOption , CodeSystem.concept , ValueSet.compose.include.concept fhir Deprecated : FMM1 n/c
resource-approvalDate 0..1 date StructureDefinition , StructureMap , CapabilityStatement , OperationDefinition ,
SearchParameter , CompartmentDefinition , ImplementationGuide , CodeSystem ,
ValueSet , ConceptMap , NamingSystem , Group 		fhir Trial-Use : FMM3 n/c
resource-effectivePeriod 0..1 Period StructureDefinition , StructureMap , CapabilityStatement , OperationDefinition ,
SearchParameter , CompartmentDefinition , ImplementationGuide , CodeSystem ,
ValueSet , ConceptMap , NamingSystem , Group 		fhir Trial-Use : FMM3 n/c
resource-lastReviewDate 0..1 date StructureDefinition , StructureMap , CapabilityStatement , OperationDefinition ,
SearchParameter , CompartmentDefinition , ImplementationGuide , CodeSystem ,
ValueSet , ConceptMap , NamingSystem , Group 		fhir Trial-Use : FMM3 n/c
structuredefinition-standards-status 0..1 code CanonicalResource , CodeSystem.concept , StructureDefinition.context ,
SearchParameter.base , ElementDefinition , ElementDefinition.type ,
ElementDefinition.type.targetProfile , OperationDefinition.parameter ,
OperationDefinition.parameter.type , OperationDefinition.parameter.allowedType ,
OperationDefinition.parameter.targetProfile , ImplementationGuide.definition.page 		fhir Trial-Use : FMM3 n/c
terminology-resource-identifier-metadata 0..* (complex) CodeSystem.identifier , ValueSet.identifier , ConceptMap.identifier vocab Trial-Use : FMM2 icon Changed:
valueset-special-status 0..1 string ValueSet , CodeSystem vocab Deprecated : FMM3 icon Changed:
Extensions defined for many resources including the CodeSystem resource
datatype 0..1 string Base fhir Trial-Use : FMM2 icon Changed:
additionalImplicitRules 0..* uri DomainResource fhir Trial-Use : FMM4 icon Added:
artifact-authoritativeSource 0..1 uri DomainResource cds Trial-Use : FMM1 icon Added:
artifact-extended-contact-detail 0..* ExtendedContactDetail Resource cds Trial-Use : FMM2 icon Added:
artifact-isOwned 0..1 boolean RelatedArtifact , ActivityDefinition.library , PlanDefinition.library ,
Measure.library , DomainResource.extension , type.exists() and type = 'composed-of' 		cds Trial-Use : FMM1 n/c
artifact-jurisdiction 0..* CodeableConcept Resource cds Trial-Use : FMM2 icon Changed:
artifactassessment-disposition 0..1 code Resource cds Draft : FMM1 n/c
artifactassessment-workflowStatus 0..1 code Resource cds Draft : FMM1 n/c
cqf-artifactComment 0..* (complex) Resource cds Trial-Use : FMM3 n/c
cqf-citation 0..1 string Resource cds Trial-Use : FMM3 n/c
cqf-definitionTerm 0..1 (complex) Resource cds Trial-Use : FMM3 n/c
cqf-directReferenceCode 0..* Coding Resource cds Trial-Use : FMM2 n/c
cqf-knowledgeCapability 0..* code DomainResource cds Trial-Use : FMM2 n/c
cqf-knowledgeRepresentationLevel 0..* code DomainResource cds Trial-Use : FMM2 n/c
cqf-library 0..* canonical DomainResource cds Trial-Use : FMM3 icon Changed:
cqf-logicDefinition 0..* (complex) DomainResource cds Trial-Use : FMM2 n/c
cqf-measureInfo 0..* (complex) Resource , Reference cds Trial-Use : FMM3 n/c
cqf-messages 0..* Reference Resource cds Trial-Use : FMM3 n/c
cqf-scope 0..1 string Resource cds Trial-Use : FMM1 n/c
derivation-reference 0..* (complex) Resource , Element fhir Trial-Use : FMM2 icon Changed:
feature-assertion 0..* (complex) Resource fhir Draft : FMM2 icon Changed:
note 0..* Annotation Resource , Composition.section , Observation.component fhir Trial-Use : FMM1 n/c
obligations-profile 0..* (complex) Provenance.target , Resource.meta fhir Draft : FMM0 icon Changed:
package-source 0..* (complex) Resource , Meta fhir Trial-Use : FMM1 n/c
patient-sexParameterForClinicalUse 0..* (complex) Resource pa Draft : FMM1 icon Changed:
resource-instance-description 0..1 markdown Resource fhir Trial-Use : FMM2 icon Changed:
resource-instance-name 0..1 string Resource fhir Trial-Use : FMM2 icon Changed:
resource-pertainsToGoal 0..* Reference Resource fhir Trial-Use : FMM3 n/c
satisfies-requirement 0..* (complex) Resource , Element fhir Trial-Use : FMM2 icon Changed:
structuredefinition-fmm 0..1 integer DomainResource , Element fhir Trial-Use : FMM3 icon Changed:
structuredefinition-fmm-support 0..1 markdown DomainResource fhir Trial-Use : FMM2 icon Changed:
structuredefinition-wg 0..1 code DomainResource fhir Trial-Use : FMM3 n/c
version-specific-use 0..* (complex) Element , Resource fhir Trial-Use : FMM1 n/c
version-specific-value 0..* (complex) Element , Resource fhir Trial-Use : FMM1 n/c
workflow-statusReason 0..* CodeableConcept DomainResource fhir Trial-Use : FMM2 icon Added:
Extensions that refer to the CodeSystem resource
valueset-supplement 0..* canonical ValueSet , ValueSet.compose.include , ValueSet.compose.exclude vocab Trial-Use : FMM3 n/c
Extensions that refer to many resources including the CodeSystem resource
alternate-reference 0..1 Reference Reference fhir Trial-Use : FMM2 icon Changed:
artifact-reference 0..1 (Choice) Element cds Deprecated : FMM1 icon Changed:
cqf-relativeDateTime 0..1 (complex) Element cds Deprecated : FMM3 n/c
diagnosticReport-focus 0..* Reference DiagnosticReport oo Draft : FMM0 icon Changed:
event-basedOn 0..* Reference Condition , ChargeItem , ClinicalImpression , Composition , Consent , Coverage ,
EpisodeOfCare , ExplanationOfBenefit , FamilyMemberHistory , ImmunizationEvaluation ,
InventoryReport , MedicationStatement , PaymentNotice , PaymentReconciliation 		fhir Trial-Use : FMM3 n/c
event-partOf 0..* Reference DiagnosticReport , Condition fhir Trial-Use : FMM3 n/c
flag-detail 0..* Reference Flag , Media pc Trial-Use : FMM3 n/c
patient-sexParameterForClinicalUse 0..* (complex) Resource pa Draft : FMM1 icon Changed:
replaces 0..* canonical ActorDefinition , CapabilityStatement , ChargeItemDefinition , CompartmentDefinition ,
ConditionDefinition , ExampleScenario , GraphDefinition , ImplementationGuide ,
MessageDefinition , ObservationDefinition , OperationDefinition , Questionnaire ,
Requirements , SearchParameter , SpecimenDefinition , StructureDefinition ,
StructureMap , SubscriptionTopic , TerminologyCapabilities , TestScript 		fhir Trial-Use : FMM3 n/c
request-replaces 0..* Reference NutritionOrder , SupplyRequest , Task fhir Trial-Use : FMM3 n/c
workflow-barrier 0..* CodeableReference Goal , CommunicationRequest , CarePlan.activity fhir Trial-Use : FMM2 icon Changed:
workflow-protectiveFactor 0..* CodeableReference Goal , CommunicationRequest , CarePlan.activity fhir Trial-Use : FMM2 icon Changed:
workflow-supportingInfo 0..* Reference DiagnosticReport , DocumentReference , Encounter , Observation , CommunicationRequest fhir Trial-Use : FMM3 n/c

101 Extensions

Extension Search Parameters

This table lists search parameters defined for any of the extensions listed above in association with the core specification.