description: Indicates alternate codings and/or original text for the concept represented by the code. Codings or text provided SHALL convey equivalent meaning to the meaning of the code being extended (though with potential differences in level of detail conveyed). package_name: hl7.fhir.uv.extensions.r4 derivation: constraint name: AlternateCodes type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/alternate-codes'} index: 1 value: choices: [valueCodeableConcept] index: 3 valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 4} package_version: 5.3.0-ballot-tc1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/alternate-codes base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.3.0-ballot-tc1 required: [value, valueCodeableConcept]