description: A standard, nominal fee charged for each prescription of a drug package_name: hl7.fhir.us.davinci-drug-formulary derivation: constraint name: CopayAmount type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/us/Davinci-drug-formulary/StructureDefinition/usdf-CopayAmount-extension'} index: 1 valueMoney: {type: Money, index: 2} package_version: 0.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/Davinci-drug-formulary/StructureDefinition/usdf-CopayAmount-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.1.0 required: [valueMoney]