This page is part of the Quality Measure STU2 for FHIR R4 Implementation Guide (v2.1.0: STU3 Ballot 1) based on FHIR R4. The current version which supercedes this version is 3.0.0. For a full list of available versions, see the Directory of published versions

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Extension: StructureDefinition - Measure populationBasis extension

The population basis specifies the type of elements in the population. For a subject-based measure, this is boolean (because the subject and the population basis are the same, and the population criteria define yes/no values for each individual in the population). For measures that have a population basis that is different than the subject, this element specifies the type of the population basis. For example, an encounter-based measure has a subject of Patient and a population basis of Encounter, and the population criteria all return lists of Encounters.

The official URL for this extension is:

http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-populationBasis

Status: active
Extension maintained by: Clinical Quality Information WG

Context of Use

This extension may be used on the following element(s):

• Measure
• Measure.group

Usage info

Usage:

• Use this Extension: CQFMComputableMeasure

Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

 

Other representations of extension: Schematron

Terminology Bindings

Path	Conformance	ValueSet
Extension.value[x]	required	FHIRAllTypes

Constraints

Id	Path	Details	Requirements
ele-1	Extension	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	Extension	Must have either extensions or value[x], not both : extension.exists() != value.exists()
ele-1	Extension.extension	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	Extension.extension	Must have either extensions or value[x], not both : extension.exists() != value.exists()
ele-1	Extension.value[x]	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())