description: An extension to provide the frequency of smoking/tobacco use. A fitting SNOMED code does not yet exist, which complicates the usage of `Observation.component` for holding the frequency qualifier. Therefore an extension is used.
package_name: healthdata.be.r4.cbb
derivation: constraint
name: ExtSmokingStatusFrequencyQualifier
type: Extension
elements:
  url:
    pattern: {type: Uri, value: 'https://fhir.healthdata.be/StructureDefinition/ext-SmokingStatus.FrequencyQualifier'}
    index: 0
  value:
    short: Frequency
    choices: [valueCodeableConcept]
    index: 2
  valueCodeableConcept: {type: CodeableConcept, short: Frequency, choiceOf: value, index: 3}
package_version: 0.10.0-beta
class: extension
kind: complex-type
url: https://fhir.healthdata.be/StructureDefinition/ext-SmokingStatus.FrequencyQualifier
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null