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 | FMM |
| Extensions defined for this resource |
| codesystem-alternate | 0..* | (complex) | CodeSystem.concept | 1 |
| codesystem-authoritativeSource | 0..1 | uri | CodeSystem | 1 |
| codesystem-concept-comments | 0..1 | string | CodeSystem.concept | 1 |
| codesystem-conceptOrder | 0..1 | integer | CodeSystem.concept | 1 |
| codesystem-history | 0..* | (complex) | CodeSystem | 1 |
| codesystem-keyWord | 0..* | string | CodeSystem | D |
| codesystem-label | 0..1 | string | CodeSystem.concept | 1 |
| codesystem-map | 0..1 | canonical | CodeSystem | 1 |
| codesystem-otherName | 0..* | (complex) | CodeSystem | 1 |
| codesystem-properties-mode | 0..1 | code | CodeSystem | 1 |
| codesystem-replacedby | 0..1 | Coding | CodeSystem.concept | 1 |
| codesystem-sourceReference | 0..1 | uri | CodeSystem | 1 |
| codesystem-trusted-expansion | 0..* | uri | CodeSystem | 1 |
| codesystem-usage | 0..* | (complex) | CodeSystem | 1 |
| codesystem-use-markdown | 0..1 | boolean | CodeSystem | 1 |
| codesystem-warning | 0..1 | markdown | CodeSystem | 1 |
| codesystem-workflowStatus | 0..1 | string | CodeSystem | 1 |
| coding-sctdescid | 0..1 | id | Coding, CodeSystem.concept.designation, ValueSet.expansion.contains.designation | 1 |
| 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 | 1 |
| resource-approvalDate | 0..1 | date | StructureDefinition, StructureMap, CapabilityStatement, OperationDefinition,
SearchParameter, CompartmentDefinition, ImplementationGuide, CodeSystem,
ValueSet, ConceptMap, NamingSystem | 1 |
| resource-effectivePeriod | 0..1 | Period | StructureDefinition, StructureMap, CapabilityStatement, OperationDefinition,
SearchParameter, CompartmentDefinition, ImplementationGuide, CodeSystem,
ValueSet, ConceptMap, NamingSystem | 1 |
| resource-lastReviewDate | 0..1 | date | StructureDefinition, StructureMap, CapabilityStatement, OperationDefinition,
SearchParameter, CompartmentDefinition, ImplementationGuide, CodeSystem,
ValueSet, ConceptMap, NamingSystem | 1 |
| terminology-resource-identifier-metadata | 0..* | (complex) | CodeSystem.identifier, ValueSet.identifier, ConceptMap.identifier | 0 |
| valueset-special-status | 0..1 | string | ValueSet, CodeSystem | 1 |
| Extensions defined for many resources including this resource |
| datatype | 0..1 | string | Base | 1 |
| artifact-author | 0..* | ContactDetail | DomainResource | 1 |
| derivation-reference | 0..* | (complex) | Resource, Element | 0 |
| patient-sexForClinicalUse | 0..* | (complex) | Resource | 1 |
| resource-instance-description | 0..1 | markdown | Resource | 1 |
| resource-instance-name | 0..1 | string | Resource | 1 |
| resource-pertainsToGoal | 0..* | Reference | Resource | 1 |
| satisfies-requirement | 0..* | (complex) | Resource, Element | 0 |
| Extensions that refer to this resource |
| valueset-supplement | 0..* | canonical | ValueSet | 1 |
| valueset-system | 0..1 | canonical | ValueSet.compose.include.system | 1 |
| Extensions that refer to many resources including this resource |
| alternate-reference | 0..1 | Reference | Reference | 1 |
| cqf-relativeDateTime | 0..1 | (complex) | Element | D |
| diagnosticReport-focus | 0..* | Reference | DiagnosticReport | 0 |
| event-basedOn | 0..* | Reference | Condition, ChargeItem, ClinicalImpression, Composition, Consent, Coverage,
DetectedIssue, DocumentManifest, EpisodeOfCare, ExplanationOfBenefit,
FamilyMemberHistory, ImmunizationEvaluation, InventoryReport, MedicationStatement,
PaymentNotice, PaymentReconciliation | 1 |
| event-partOf | 0..* | Reference | DiagnosticReport, Condition | 1 |
| flag-detail | 0..* | Reference | Flag | 1 |
| patient-sexForClinicalUse | 0..* | (complex) | Resource | 1 |
| 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 | 1 |
| request-replaces | 0..* | Reference | NutritionOrder, SupplyRequest, Task | 1 |
| workflow-barrier | 0..* | CodeableReference | Goal, CommunicationRequest, CarePlan.activity | 1 |
| workflow-protectiveFactor | 0..* | CodeableReference | Goal, CommunicationRequest, CarePlan.activity | 1 |
| workflow-supportingInfo | 0..* | Reference | DiagnosticReport, DocumentReference, Encounter, Observation, CommunicationRequest | 1 |
Terminology
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