description: The date when this item's preauthorization was issued. package_name: hl7.fhir.us.davinci-pas derivation: constraint name: ItemPreAuthIssueDate type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/davinci-pas/StructureDefinition/extension-itemPreAuthIssueDate'} index: 1 value: choices: [valueDate] index: 3 valueDate: {type: date, choiceOf: value, index: 4} package_version: 2.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/davinci-pas/StructureDefinition/extension-itemPreAuthIssueDate base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.1.0