description: Gene in which the sequence is found. Currently values from HGNC are supported. Other systems or genes not defined in HGNC (e.g. BCR-ABL fusion gene) can be added by using local extension.
package_name: hl7.fhir.core
derivation: constraint
name: Gene Identifier
type: null
elements:
  extension: {name: extension, index: 0}
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/observation-geneticsGene'}
    index: 1
  value:
    choices: [valueCodeableConcept]
    index: 3
  valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 4}
package_version: 1.4.0
extensions: {}
class: datatype
kind: datatype
url: http://hl7.org/fhir/StructureDefinition/observation-geneticsGene
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null
required: [value, valueCodeableConcept]