FHIR Extensions Pack v5.4.0 (2026-10-09)

FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.4.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. 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 v5.3.0
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 n/c
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 n/c
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 n/c
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 n/c
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 n/c
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 n/c
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 n/c
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 n/c
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 n/c
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 n/c
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 n/c
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 Trial-Use : FMM1 Changed (M)
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 n/c
codesystem-concept-comments 0..1 string CodeSystem.concept vocab Trial-Use : FMM3 n/c
codesystem-conceptOrder 0..1 integer CodeSystem.concept vocab Trial-Use : FMM3 n/c
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 n/c
codesystem-history 0..* (complex) CodeSystem vocab Deprecated : FMM3 n/c
codesystem-keyWord 0..* string CodeSystem vocab Trial-Use : FMM3 n/c
codesystem-label 0..1 string CodeSystem.concept vocab Trial-Use : FMM3 Changed (D)
codesystem-map 0..1 canonical CodeSystem vocab Trial-Use : FMM3 n/c
codesystem-otherName 0..* (complex) CodeSystem vocab Deprecated : FMM3 n/c
codesystem-properties-mode 0..1 code CodeSystem vocab Trial-Use : FMM2 n/c
codesystem-property-valueset 0..1 canonical CodeSystem.property vocab Trial-Use : FMM1 n/c
codesystem-replacedby 0..1 Coding CodeSystem.concept vocab Trial-Use : FMM3 n/c
codesystem-reservedCodeSpace 0..* (complex) CodeSystem fhir Draft : FMM0 Added
codesystem-sourceReference 0..1 uri CodeSystem vocab Deprecated : FMM3 n/c
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 n/c
codesystem-warning 0..1 markdown CodeSystem vocab Trial-Use : FMM3 n/c
codesystem-workflowStatus 0..1 string CodeSystem vocab Deprecated : FMM3 n/c
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
terminology-resource-identifier-metadata 0..* (complex) CodeSystem.identifier , ValueSet.identifier , ConceptMap.identifier vocab Trial-Use : FMM2 n/c
valueset-special-status 0..1 string ValueSet , CodeSystem vocab Deprecated : FMM3 n/c
Extensions defined for many resources including the CodeSystem resource
datatype 0..1 string Base fhir Trial-Use : FMM2 n/c
additionalImplicitRules 0..* uri DomainResource fhir Trial-Use : FMM4 n/c
artifact-authoritativeSource 0..1 uri DomainResource cds Trial-Use : FMM1 n/c
artifact-extended-contact-detail 0..* ExtendedContactDetail Resource cds Trial-Use : FMM2 n/c
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 n/c
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 n/c
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 n/c
feature-assertion 0..* (complex) Resource fhir Trial-Use : FMM2 n/c
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 n/c
package-source 0..* (complex) Resource , Meta , RelatedArtifact fhir Trial-Use : FMM1 Changed (D)
patient-sexParameterForClinicalUse 0..* (complex) Resource pa Trial-Use : FMM1 Changed (M)
resource-instance-description 0..1 markdown Resource fhir Trial-Use : FMM2 n/c
resource-instance-name 0..1 string Resource fhir Trial-Use : FMM2 n/c
resource-pertainsToGoal 0..* Reference Resource fhir Trial-Use : FMM3 n/c
satisfies-requirement 0..* (complex) Resource , Element fhir Trial-Use : FMM2 n/c
structuredefinition-fmm 0..1 integer DomainResource , Element fhir Trial-Use : FMM3 n/c
structuredefinition-fmm-support 0..1 markdown DomainResource fhir Trial-Use : FMM2 n/c
structuredefinition-wg 0..1 code DomainResource fhir Trial-Use : FMM3 Changed (C)
version-specific-use 0..* (complex) Element , Resource fhir Trial-Use : FMM1 Changed (D)
version-specific-value 0..* (complex) Element , Resource fhir Trial-Use : FMM1 n/c
workflow-statusReason 0..* CodeableConcept DomainResource fhir Trial-Use : FMM2 n/c
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 n/c
artifact-reference 0..1 (Choice) Element cds Deprecated : FMM1 n/c
cqf-relativeDateTime 0..1 (complex) Element cds Deprecated : FMM3 n/c
diagnosticReport-focus 0..* Reference DiagnosticReport oo Draft : FMM0 n/c
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 Trial-Use : FMM1 Changed (M)
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 Changed (D)
workflow-protectiveFactor 0..* CodeableReference Goal , CommunicationRequest , CarePlan.activity fhir Trial-Use : FMM2 Changed (D)
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.