description: Extension for AllergyIntolerance eCC category internal code. package_name: fmcna.caredata.fhir.ig.r4 derivation: constraint name: FreseniusAllergyCategoryEccExtension type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://fkcfhir.org/fhir/StructureDefinition/fmc-allergy-category-extn'} index: 1 value: choices: [valueCode] index: 3 valueCode: {type: code, choiceOf: value, index: 4} package_version: 1.1.4 extensions: {} class: extension kind: complex-type url: http://fkcfhir.org/fhir/StructureDefinition/fmc-allergy-category-extn base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [valueCode, value]