description: 'Carries a postcoordinated ICD-11 cluster expression as a single string\non a Coding element where the stem code alone is insufficient to fully\nrepresent the clinical concept.\n\nA cluster expression combines a stem code with one or more satellite\ncodes using the & operator (combination) or / operator (specificity).\nExample: NC72.Z&XK8G&XJ7ZH&XJ7YM\n  - NC72.Z  — stem: Fracture of femur, unspecified\n  - XK8G    — satellite: laterality\n  - XJ7ZH   — satellite: fracture subtype\n  - XJ7YM   — satellite: fracture open or closed\n\nUsage rules:\n  - SHALL only be present when the expression contains at least one\n    satellite code joined by & or / operators.\n  - Single stem codes SHALL be represented in Coding.code only and\n    validated via OCL $validate-code. The cluster validator at\n    https://icd11.dghs.gov.bd/cluster/validate explicitly rejects\n    stem-only expressions.\n  - The stem code in Coding.code SHALL match the leading stem code\n    in this expression string.\n  - Satellite codes in the cluster expression are exempt from the\n    Diagnosis/Finding class restriction that applies to stem codes\n    in Condition.code.\n  - Cluster expressions SHALL be validated against the Bangladesh\n    ICD-11 Cluster Validator at https://icd11.dghs.gov.bd/cluster/validate\n    prior to submission to the HIE.\n\nCluster validator endpoint:\n  POST https://icd11.dghs.gov.bd/cluster/validate\n  Body: { \"expression\": \"NC72.Z&XK8G&XJ7ZH&XJ7YM\" }\n\nThis extension is not MustSupport and is not mandatory. It is present\nonly when postcoordination is clinically required. Cluster expressions\nare typically sourced from the WHO Electronic Coding Tool (ECT) at the\npoint of care.'
package_name: bd.fhir.core
derivation: constraint
name: ICD11ClusterExpression
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'https://fhir.dghs.gov.bd/core/StructureDefinition/icd11-cluster-expression'}
    index: 1
  value:
    short: ICD-11 postcoordinated cluster expression string
    choices: [valueString]
    index: 3
  valueString: {type: string, short: ICD-11 postcoordinated cluster expression string, choiceOf: value, index: 4}
package_version: 0.3.0
extensions: {}
class: extension
kind: complex-type
url: https://fhir.dghs.gov.bd/core/StructureDefinition/icd11-cluster-expression
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 0.3.0
required: [valueString, value]