description: This extension provides concepts to describe the gender a person identifies as. package_name: hl7.fhir.us.core derivation: constraint name: USCoreGenderIdentityExtension type: Extension elements: url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/core/StructureDefinition/us-core-genderIdentity'} index: 0 value: choices: [] index: 2 package_version: 5.0.0 class: extension kind: complex-type url: http://hl7.org/fhir/us/core/StructureDefinition/us-core-genderIdentity base: http://hl7.org/fhir/StructureDefinition/patient-genderIdentity version: 5.0.0