Quality Measure Implementation Guide (STU5)
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Quality Measure Implementation Guide (STU5), published by HL7 International / Clinical Quality Information. This guide is not an authorized publication; it is the continuous build for version 5.0.0-draft built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/cqf-measures/ and changes regularly. See the Directory of published versions

Extension: CQFM Population Basis

Official URL: http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-populationBasis Version: 4.0.0
Active as of 2024-07-23 Computable Name: CQFMPopulationBasis
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. Note that the subject of a measure can be found in the element [subject[x] https://hl7.org/fhir/us/cqfmeasures/2024Jan/StructureDefinition-computable-measure-cqfm-definitions.html#Measure.subject[x]]

A measure specification needs to be able to specify the expected result type of each population criteria. This value SHALL be consistent with the result type of all population-level criteria in the measure.

Context of Use

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

  • Element ID Measure
  • Element ID Measure.group
  • Element ID Measure.group.population

Usage info

Usage:

Formal Views of Extension Content

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

This structure is derived from Extension

Summary

Simple Extension of type code: 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. Note that the subject of a measure can be found in the element [subject[x]|https://hl7.org/fhir/us/cqfmeasures/2024Jan/StructureDefinition-computable-measure-cqfm-definitions.html#Measure.subject[x]]

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1 Extension What type of population
... url 1..1 uri "http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-populationBasis"
... value[x] 0..1 code Value of extension
Binding: FHIRAllTypes (required): The type of elements in the population


doco Documentation for this format
NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1 Extension What type of population
... id 0..1 string Unique id for inter-element referencing
... extension 0..* Extension Additional content defined by implementations
Slice: Unordered, Open by value:url
... url 1..1 uri "http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-populationBasis"

doco Documentation for this format

This structure is derived from Extension

Summary

Simple Extension of type code: 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. Note that the subject of a measure can be found in the element [subject[x]|https://hl7.org/fhir/us/cqfmeasures/2024Jan/StructureDefinition-computable-measure-cqfm-definitions.html#Measure.subject[x]]

Differential View

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1 Extension What type of population
... url 1..1 uri "http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-populationBasis"
... value[x] 0..1 code Value of extension
Binding: FHIRAllTypes (required): The type of elements in the population


doco Documentation for this format

Snapshot View

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1 Extension What type of population
... id 0..1 string Unique id for inter-element referencing
... extension 0..* Extension Additional content defined by implementations
Slice: Unordered, Open by value:url
... url 1..1 uri "http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-populationBasis"

doco Documentation for this format

 

Other representations of profile: CSV, Excel, Schematron

Terminology Bindings

PathConformanceValueSetURI
Extension.value[x]requiredFHIRAllTypes
http://hl7.org/fhir/ValueSet/all-types
from the FHIR Standard

Constraints

IdGradePath(s)DetailsRequirements
ele-1error**ALL** elementsAll FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
ext-1error**ALL** extensionsMust have either extensions or value[x], not both
: extension.exists() != value.exists()