## 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: '2024-12-16T21:50:47+00:00' vs '2025-09-11T18:58:45+00:00'
Information | StructureDefinition.comment | Values for comment differ: 'In Health Quality Measure Format, this was referred to as the Item Count metadata attribute.' vs 'In Health Quality Measure Format, this was referred to as the Item Count metadata attribute. If the populationBasis is specified as a data requirement, the type SHALL be present, profile and codeFilter MAY be present, and no other elements are allowed. This usage allows population basis to be stated with more specificity, e.g. CT Scans, rather than just DiagnosticReport.'
Information | Extension | Element maximum cardinalities differ: '1' vs '2147483647'

### Metadata

Name | Value | Comments
--- | --- | ---
abstract | false |
baseDefinition | http://hl7.org/fhir/StructureDefinition/Extension |
copyright |  |
date | 2024-12-16T21:50:47+00:00 | 2025-09-11T18:58:45+00:00 | 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 |  | 0..1 | Extension | What type of population | C | 0..* | Extension | What type of population Constraints: popBasis-1 | Element maximum cardinalities differ: '1' vs '2147483647'
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 | 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