description: The reason a planned or prescribed radiotherapy treatment was revised, superceded, or adapted. package_name: hl7.fhir.us.codex derivation: constraint name: RadiotherapyReasonForRevisionOrAdaptation type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiotherapy-reason-for-revision-or-adaptation'} index: 1 value: short: Reason for Revision or Adaptation choices: [valueCodeableConcept] index: 3 valueCodeableConcept: {type: CodeableConcept, short: Reason for Revision or Adaptation, choiceOf: value, index: 4} package_version: radiation-therapy-2.0.0-ballot extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiotherapy-reason-for-revision-or-adaptation base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0-ballot required: [value, valueCodeableConcept]