2026 US Quality Core Implementation Guide
0.5.0 - release

2026 US Quality Core Implementation Guide - Downloaded Version 0.5.0 See the Directory of published versions

## Extension: US Quality Core Not Done Reason

Official URL: http://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-notDoneReason | Version: 0.5.0 | Highlight text changes?
Active as of 2026-06-05 | Computable Name: USQualityCoreNotDoneReason

Indicates the reason the event was not done.

Context of Use

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

- Element ID: `Resource`

Usage

See the patterns page for implementation and usage patterns.

### Examples

Usage info

Usages:

- Use this Extension: US Quality Core Observation Cancelled
- Examples for this Extension: Observation/negation-example and Observation/negation-with-code-example

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 | Extension
url |  | 1..1 | uri | "http://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-notDoneReason"
value[x] |  | 0..1 | CodeableConcept | Value of extension Binding: USQualityCore Negation Reason Codes (extensible): The reason the event did not occur or was not performed
Documentation for this format

#### Terminology Bindings (Differential)

Path | Status | Usage | ValueSet | Version | Source
Extension.value[x] | Base | extensible | USQualityCore Negation Reason Codes | 📦0.5.0 | This IG

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..1 | Extension | Extension
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://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-notDoneReason"
value[x] |  | 0..1 | CodeableConcept | Value of extension Binding: USQualityCore Negation Reason Codes (extensible): The reason the event did not occur or was not performed
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Extension.value[x] | Base | extensible | USQualityCore Negation Reason Codes | 📦0.5.0 | This IG

#### 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 CodeableConcept: Indicates the reason the event was not done.

Differential ViewDifferential View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..1 | Extension | Extension
url |  | 1..1 | uri | "http://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-notDoneReason"
value[x] |  | 0..1 | CodeableConcept | Value of extension Binding: USQualityCore Negation Reason Codes (extensible): The reason the event did not occur or was not performed
Documentation for this format

#### Terminology Bindings (Differential)

Path | Status | Usage | ValueSet | Version | Source
Extension.value[x] | Base | extensible | USQualityCore Negation Reason Codes | 📦0.5.0 | This IG

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..1 | Extension | Extension
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://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-notDoneReason"
value[x] |  | 0..1 | CodeableConcept | Value of extension Binding: USQualityCore Negation Reason Codes (extensible): The reason the event did not occur or was not performed
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Extension.value[x] | Base | extensible | USQualityCore Negation Reason Codes | 📦0.5.0 | This IG

#### 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 CodeableConcept: Indicates the reason the event was not done.

Other representations of profile: CSV, Excel, Schematron