description: A boolean indicating whether the formulary item is currently available under the formulary. Drugs may appear on a formulary, but not considered \"active\" for the current year. Drugs may also be removed during the course of a plan year. package_name: hl7.fhir.us.davinci derivation: constraint name: AvailabilityStatus type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/davinci-drug-formulary/StructureDefinition/usdf-AvailabilityStatus-extension'} index: 1 value: mustSupport: true choices: [valueCode] index: 3 valueCode: {type: code, mustSupport: true, choiceOf: value, index: 4} package_version: drug-formulary-2.0.1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/davinci-drug-formulary/StructureDefinition/usdf-AvailabilityStatus-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.1 required: [valueCode, value]