http://hl7.org/fhir/StructureDefinition/allergyintolerance-reasonRefuted|4.0.1

A code capturing the explanation of why the allergy or intolerance has been refuted. Should be specified only if the status is refuted.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/CodeableConcept