http://hl7.org/fhir/StructureDefinition/patient-unknownIdentity|5.2.0

Indicates whether or not the patient's/person's identity is known.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/CodeableConcept
Extension.value[x].binding.valueSethttp://hl7.org/fhir/ValueSet/patient-unknownIdentity