This page is part of the FHIR Core Extensions Registry (v5.2.0: Release 5.2) 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
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 | Conf. | Type | Context | WG | Status | Δ v1.0.0 |
| Extensions defined for the CodeSystem resource |
| codesystem-alternate | 0..* | (complex) | CodeSystem.concept | ti | Trial-Use: FMM3 |  Changed: |
| codesystem-author | 0..* | string | CodeSystem | vocab | Deprecated: FMM1 |  Added: |
| codesystem-authoritativeSource | 0..1 | uri | CodeSystem | ti | Deprecated: FMM2 | Changed: |
| codesystem-concept-comments | 0..1 | string | CodeSystem.concept | ti | Trial-Use: FMM3 | Changed: |
| codesystem-conceptOrder | 0..1 | integer | CodeSystem.concept | ti | Deprecated: FMM3 | Changed: |
| codesystem-effectiveDate | 0..1 | date | CodeSystem | vocab | Deprecated: FMM1 | Added: |
| codesystem-expirationDate | 0..1 | date | CodeSystem | vocab | Deprecated: FMM1 | Added: |
| codesystem-history | 0..* | (complex) | CodeSystem | ti | Trial-Use: FMM3 | Changed: |
| codesystem-keyWord | 0..* | string | CodeSystem | ti | Deprecated: FMM3 | Changed: |
| codesystem-label | 0..1 | string | CodeSystem.concept | ti | Trial-Use: FMM3 | Changed: |
| codesystem-map | 0..1 | canonical | CodeSystem | ti | Trial-Use: FMM3 | Changed: |
| codesystem-otherName | 0..* | (complex) | CodeSystem | ti | Deprecated: FMM3 | Changed: |
| codesystem-properties-mode | 0..1 | code | CodeSystem | ti | Trial-Use: FMM2 | Changed: |
| codesystem-property-valueset | 0..1 | canonical | CodeSystem.property | ti | Trial-Use: FMM1 | Added: |
| codesystem-replacedby | 0..1 | Coding | CodeSystem.concept | ti | Trial-Use: FMM3 | Changed: |
| codesystem-sourceReference | 0..1 | uri | CodeSystem | ti | Deprecated: FMM3 | Changed: |
| codesystem-trusted-expansion | 0..* | uri | CodeSystem | ti | Trial-Use: FMM3 | Changed: |
| codesystem-usage | 0..* | (complex) | CodeSystem | ti | Trial-Use: FMM3 | Changed: |
| codesystem-use-markdown | 0..1 | boolean | CodeSystem | ti | Deprecated: FMM2 | Changed: |
| codesystem-warning | 0..1 | markdown | CodeSystem | ti | Trial-Use: FMM3 | Changed: |
| codesystem-workflowStatus | 0..1 | string | CodeSystem | ti | Deprecated: FMM3 | 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 | Added: |
| replaces | 0..* | canonical | ActivityDefinition, ActorDefinition, CapabilityStatement, ChargeItemDefinition,
Citation, CodeSystem, CompartmentDefinition, ConceptMap, ConditionDefinition,
EventDefinition, Evidence, EvidenceReport, EvidenceVariable, ExampleScenario,
GraphDefinition, ImplementationGuide, Library, Measure, MessageDefinition,
NamingSystem, ObservationDefinition, OperationDefinition, PlanDefinition,
Questionnaire, Requirements, SearchParameter, SpecimenDefinition,
StructureDefinition, StructureMap, SubscriptionTopic, TerminologyCapabilities,
TestScript, ValueSet | fhir | Trial-Use: FMM3 | 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.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 | ti | Trial-Use: FMM2 | Changed: |
| valueset-special-status | 0..1 | string | ValueSet, CodeSystem | ti | Deprecated: FMM3 | Changed: |
| Extensions defined for many resources including the CodeSystem resource |
| datatype | 0..1 | string | Base | fhir | Trial-Use: FMM2 | n/c |
| artifact-approvalDate | 0..1 | date | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-author | 0..* | ContactDetail | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-citeAs | 0..1 | (Choice) | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-contact | 0..* | ContactDetail | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-copyright | 0..1 | markdown | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-copyrightLabel | 0..1 | string | Resource | cds | Experimental
Draft: FMM1 | Changed: |
| artifact-date | 0..1 | dateTime | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-description | 0..1 | markdown | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-effectivePeriod | 0..1 | Period | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-experimental | 0..1 | boolean | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-identifier | 0..* | Identifier | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-isOwned | 0..1 | boolean | RelatedArtifact, ActivityDefinition.library, PlanDefinition.library,
Measure.library, DomainResource.extension, type.exists() and type = 'composed-of' | cds | Trial-Use: FMM1 | Added: |
| artifact-jurisdiction | 0..* | CodeableConcept | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-lastReviewDate | 0..1 | date | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-name | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-publisher | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-purpose | 0..1 | markdown | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-relatedArtifact | 0..* | RelatedArtifact | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-releaseDescription | 0..1 | markdown | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-releaseLabel | 0..1 | string | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-status | 0..1M | code | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-title | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-topic | 0..* | CodeableConcept | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-url | 0..1 | uri | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-usage | 0..1 | markdown | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-useContext | 0..* | UsageContext | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-version | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-versionAlgorithm | 0..1 | (Choice) | Resource | cds | Draft: FMM1 | Changed: |
| artifact-versionPolicy | 0..1 | CodeableConcept | Resource | cds | Trial-Use: FMM1 | Added: |
| artifactassessment-disposition | 0..1 | code | Resource | cds | Draft: FMM1 | Added: |
| artifactassessment-workflowStatus | 0..1 | code | Resource | cds | Draft: FMM1 | Added: |
| cqf-artifactComment | 0..* | (complex) | Resource | cds | Trial-Use: FMM3 | Changed: |
| cqf-citation | 0..1 | string | Resource | cds | Trial-Use: FMM3 | Changed: |
| cqf-definitionTerm | 0..1 | (complex) | Resource | cds | Trial-Use: FMM3 | Added: |
| cqf-directReferenceCode | 0..* | Coding | Resource | cds | Trial-Use: FMM2 | Changed: |
| cqf-knowledgeCapability | 0..* | code | DomainResource | cds | Trial-Use: FMM2 | Changed: |
| cqf-knowledgeRepresentationLevel | 0..* | code | DomainResource | cds | Trial-Use: FMM2 | Changed: |
| cqf-library | 0..* | canonical | DomainResource | cds | Trial-Use: FMM3 | Changed: |
| cqf-logicDefinition | 0..* | (complex) | DomainResource | cds | Trial-Use: FMM2 | Changed: |
| cqf-measureInfo | 0..* | (complex) | Resource, Reference | cds | Trial-Use: FMM3 | Changed: |
| cqf-messages | 0..* | Reference | Resource | cds | Trial-Use: FMM3 | Added: |
| cqf-scope | 0..1 | string | Resource | cds | Trial-Use: FMM1 | Added: |
| derivation-reference | 0..* | (complex) | Resource, Element | fhir | Trial-Use: FMM2 | n/c |
| feature-assertion | 0..* | Coding | Provenance.target, Resource.meta | fhir | Experimental
Draft: FMM0 | Added: |
| note | 0..* | Annotation | Resource, Composition.section | fhir | Trial-Use: FMM1 | Added: |
| obligations-profile | 0..* | (complex) | Provenance.target, Resource.meta | fhir | Experimental
Draft: FMM0 | Added: |
| package-source | 0..* | (complex) | Resource, Meta | fhir | Trial-Use: FMM1 | Added: |
| patient-sexParameterForClinicalUse | 0..* | (complex) | Resource | pa | Experimental
Draft: FMM1 | Changed: |
| 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 | Changed: |
| satisfies-requirement | 0..* | (complex) | Resource, Element | fhir | Trial-Use: FMM2 | Changed: |
| structuredefinition-fmm | 0..1 | integer | DomainResource, Resource | 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 | n/c |
| version-specific-use | 0..* | (complex) | Element, Resource | fhir | Trial-Use: FMM1 | Added: |
| version-specific-value | 0..* | (complex) | Element, Resource | fhir | Trial-Use: FMM1 | Added: |
| Extensions that refer to the CodeSystem resource |
| valueset-supplement | 0..* | canonical | ValueSet | ti | Trial-Use: FMM3 | Changed: |
| 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 | Trial-Use: FMM1 | Added: |
| cqf-relativeDateTime | 0..1 | (complex) | Element | cds | Deprecated: FMM3 | Changed: |
| diagnosticReport-focus | 0..* | Reference | DiagnosticReport | oo | Experimental
Draft: FMM0 | Changed: |
| event-basedOn | 0..* | Reference | Condition, ChargeItem, ClinicalImpression, Composition, Consent, Coverage,
DetectedIssue, 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 | pc | Trial-Use: FMM3 | Changed: |
| patient-sexParameterForClinicalUse | 0..* | (complex) | Resource | pa | Experimental
Draft: FMM1 | Changed: |
| replaces | 0..* | canonical | ActivityDefinition, ActorDefinition, CapabilityStatement, ChargeItemDefinition,
Citation, CodeSystem, CompartmentDefinition, ConceptMap, ConditionDefinition,
EventDefinition, Evidence, EvidenceReport, EvidenceVariable, ExampleScenario,
GraphDefinition, ImplementationGuide, Library, Measure, MessageDefinition,
NamingSystem, ObservationDefinition, OperationDefinition, PlanDefinition,
Questionnaire, Requirements, SearchParameter, SpecimenDefinition,
StructureDefinition, StructureMap, SubscriptionTopic, TerminologyCapabilities,
TestScript, ValueSet | 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 | n/c |
| workflow-protectiveFactor | 0..* | CodeableReference | Goal, CommunicationRequest, CarePlan.activity | fhir | Trial-Use: FMM2 | n/c |
| workflow-supportingInfo | 0..* | Reference | DiagnosticReport, DocumentReference, Encounter, Observation, CommunicationRequest | fhir | Trial-Use: FMM3 | n/c |
This table lists search parameters defined for any of the extensions listed above in association with the core specification.
Terminology
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