description: The fill number of the prescription dispensed. The value representing a prescription's initial fill is 1. The first refill is 2, etc. package_name: hl7.fhir.us.pdmp.r4 derivation: constraint name: PrescriptionFillNumberExtension type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/pdmp/StructureDefinition/pdmp-extension-rx-fill-number'} index: 1 value: short: Fill Number choices: [valuePositiveInt] index: 3 valuePositiveInt: {type: positiveInt, short: Fill Number, choiceOf: value, index: 4} package_version: 1.0.0-ballot extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/pdmp/StructureDefinition/pdmp-extension-rx-fill-number base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0-ballot required: [valuePositiveInt, value]