description: This extends the Patient resource to support the exchange of information about the reason why a patient does not have an NHS Number. package_name: fhir.r4.ukcore.stu3.currentbuild derivation: constraint name: ExtensionUKCoreNHSNumberUnavailableReason type: Extension elements: url: pattern: {type: uri, value: 'https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-NHSNumberUnavailableReason'} type: uri index: 0 value: short: The reason why a patient does not have an NHS Number choices: [valueCodeableConcept] index: 2 valueCodeableConcept: {type: CodeableConcept, short: The reason why a patient does not have an NHS Number, choiceOf: value, index: 3} package_version: 0.0.10-pre-release class: extension kind: complex-type url: https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-NHSNumberUnavailableReason base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0 required: [value, valueCodeableConcept]