## Profile Comparison between http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis vs http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis

Left: | CQM Population Basis (http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis)
Right: | CQM Population Basis (http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis)

### Messages

Information | StructureDefinition.date | Values for date differ: '2025-09-11T18:58:45+00:00' vs '2026-04-07T02:06:45+10:00'

### Metadata

Name | Value | Comments
--- | --- | ---
abstract | false |
baseDefinition | http://hl7.org/fhir/StructureDefinition/Extension |
copyright |  |
date | 2025-09-11T18:58:45+00:00 | 2026-04-07T02:06:45+10:00 | Values Differ
description | 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/uv/cqm/StructureDefinition-cqm-computablemeasure-definitions.html#Measure.subject[x]) |
experimental | false |
fhirVersion | 4.0.1 |
jurisdiction |  |
jurisdiction[0] | http://unstats.un.org/unsd/methods/m49/m49.htm#001 |
kind | complex-type |
name | CQMPopulationBasis |
publisher | HL7 International / Clinical Quality Information |
purpose | 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. |
status | active |
title | CQM Population Basis |
type | Extension |
url | http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis |
version | 1.0.0 |

### Structure

Name | L Flags | L Card. | L Type | L Description & Constraints | R Flags | R Card. | R Type | R Description & Constraints | Comments
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Extension | C | 0..* | Extension | What type of population Constraints: popBasis-1 | C | 0..* | Extension | What type of population Constraints: popBasis-1 |
id |  | 0..1 | string | Unique id for inter-element referencing |  | 0..1 | string | Unique id for inter-element referencing |
Slices for extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url |
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis" |  | 1..1 | uri | "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis" |
value[x] |  | 0..1 | code, DataRequirement | Value of extension Binding: ?? (required): The type of elements in the population |  | 0..1 | code, DataRequirement | Value of extension Binding: ?? (required): The type of elements in the population |
Documentation for this format