| Name | Value | Comments |
|---|
abstract | false | |
baseDefinition | http://hl7.org/fhir/StructureDefinition/Extension | |
copyright | | |
date | 2026-10-12T13:41:39+00:00 | 2026-10-12T14:57:28+00:00 | |
description | Carries a postcoordinated ICD-11 cluster expression as a single string
on a Coding element where the stem code alone is insufficient to fully
represent the clinical concept.
A cluster expression combines a stem code with one or more satellite
codes using the & operator (combination) or / operator (specificity).
Example: NC72.Z&XK8G&XJ7ZH&XJ7YM
- NC72.Z — stem: Fracture of femur, unspecified
- XK8G — satellite: laterality
- XJ7ZH — satellite: fracture subtype
- XJ7YM — satellite: fracture open or closed
Usage rules:
- SHALL only be present when the expression contains at least one
satellite code joined by & or / operators.
- Single stem codes SHALL be represented in Coding.code only and
validated via OCL $validate-code. The cluster validator at
https://icd11.dghs.gov.bd/cluster/validate explicitly rejects
stem-only expressions.
- The stem code in Coding.code SHALL match the leading stem code
in this expression string.
- Satellite codes in the cluster expression are exempt from the
Diagnosis/Finding class restriction that applies to stem codes
in Condition.code.
- Cluster expressions SHALL be validated against the Bangladesh
ICD-11 Cluster Validator at https://icd11.dghs.gov.bd/cluster/validate
prior to submission to the HIE.
Cluster validator endpoint:
POST https://icd11.dghs.gov.bd/cluster/validate
Body: { "expression": "NC72.Z&XK8G&XJ7ZH&XJ7YM" }
This extension is not MustSupport and is not mandatory. It is present
only when postcoordination is clinically required. Cluster expressions
are typically sourced from the WHO Electronic Coding Tool (ECT) at the
point of care. | |
experimental | false | |
fhirVersion | 4.0.1 | |
jurisdiction | | |
 jurisdiction[0] | urn:iso:std:iso:3166#050 | |
kind | complex-type | |
name | ICD11ClusterExpression | |
publisher | Directorate General of Health Services (DGHS), Bangladesh | |
purpose | | |
status | active | |
title | ICD-11 Cluster Expression | |
type | Extension | |
url | https://fhir.dghs.gov.bd/core/StructureDefinition/icd11-cluster-expression | |
version | 0.4.7 | 0.4.8 | |