description: A fee charged for each prescription of a drug, expressed as a percentage of that drug's overall cost package_name: hl7.fhir.us.davinci-drug-formulary derivation: constraint name: CoInsuranceRate type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/us/Davinci-drug-formulary/StructureDefinition/usdf-CoInsuranceRate-extension'} index: 1 valueDecimal: {type: decimal, index: 2} package_version: 0.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/Davinci-drug-formulary/StructureDefinition/usdf-CoInsuranceRate-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.1.0 required: [valueDecimal]