Quality Measure Implementation Guide
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## Extension: CQM Rate Aggregation

Official URL: http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-rateAggregation | Version: 1.0.0 | Highlight text changes?
Standards status: Trial-use Active as of 2026-04-07 | Maturity Level: 4 | Computable Name: CQMRateAggregation
Other Identifiers: OID:2.16.840.1.113883.4.642.40.61.42.24

Describes how to combine the information calculated, based on logic in each of several populations, into one summarized result.

Context of Use

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

- Element ID: `Measure.group`

Usage info

Usages:

- Use this Extension: CQM Computable Measure
- Examples for this Extension: MultiRateExample

You can also check for usages in the FHIR IG Statistics

### Formal Views of Extension Content

Description Differentials, Snapshots, and other representations.

- Differential Table
- Snapshot Table
- Statistics/References
- All

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..1 | Extension | How is rate aggregation performed for this measure
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-rateAggregation"
value[x] |  | 0..1 | string | Value of extension
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..1 | Extension | How is rate aggregation performed for this measure
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/uv/cqm/StructureDefinition/cqm-rateAggregation"
value[x] |  | 0..1 | string | Value of extension
Documentation for this format

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

Summary

Simple Extension with the type string: Describes how to combine the information calculated, based on logic in each of several populations, into one summarized result.

Maturity: 4

Differential ViewDifferential View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..1 | Extension | How is rate aggregation performed for this measure
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-rateAggregation"
value[x] |  | 0..1 | string | Value of extension
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..1 | Extension | How is rate aggregation performed for this measure
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/uv/cqm/StructureDefinition/cqm-rateAggregation"
value[x] |  | 0..1 | string | Value of extension
Documentation for this format

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

Summary

Simple Extension with the type string: Describes how to combine the information calculated, based on logic in each of several populations, into one summarized result.

Maturity: 4

Other representations of profile: CSV, Excel, Schematron