description: Unique, generated Plan ID number, such as HIOS ID for QHPs or Contract Number for Medicare Advantage Plans. Plan IDs must be unique within each organization that manages their formulary data. package_name: hl7.fhir.us.davinci derivation: constraint name: PlanID type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/davinci-drug-formulary/StructureDefinition/usdf-PlanID-extension'} index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: drug-formulary-1.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/davinci-drug-formulary/StructureDefinition/usdf-PlanID-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.1.0 required: [valueString, value]