2026 US Quality Core Implementation Guide
0.5.0 - cibuild US

2026 US Quality Core Implementation Guide, published by Office of the National Coordinator for Health Information Technology (ONC). This guide is not an authorized publication; it is the continuous build for version 0.5.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/FHIR/us-quality-core/ and changes regularly. See the Directory of published versions

## Resource Profile: US Quality Core BodyStructure

Official URL: http://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-bodystructure | Version: 0.5.0
Active as of 2026-05-15 | Computable Name: USQualityCoreBodyStructure

Profile of BodyStructure for decision support/quality metrics. Defines the core set of elements and extensions for quality rule and measure authors.

Usage

See the patterns page for implementation and usage patterns.

### Examples

BodyStructure example identifying a specific tumor or lesion - identifying a specific tumor or lesion

Usages:

- Examples for this Profile: BodyStructure/example

You can also check for usages in the FHIR IG Statistics

### Formal Views of Profile Content

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

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

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
BodyStructure |  | 0..* | BodyStructure | Specific and identified anatomical structure
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
active | ?!Σ | 1..1 | boolean | Whether this record is in active use
location | Σ | 1..1 | CodeableConcept | Body site Binding: SNOMEDCTBodyStructures (preferred)
locationQualifier |  | 0..* | CodeableConcept | Body site modifier Binding: BodystructureLocationQualifier (preferred): Concepts modifying the anatomic location
patient | Σ | 1..1 | Reference(US Quality Core Patient) | Who this is about
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
BodyStructure.location | Base | preferred | SNOMED CT Body Structures | 📦4.0.1 | FHIR Std.
BodyStructure.locationQualifier | Base | preferred | Bodystructure Location Qualifier | 📦4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | BodyStructure | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | BodyStructure | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource | `contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()`
dom-4 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated | `contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()`
dom-5 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | BodyStructure | A resource should have narrative for robust management | `text.`div`.exists()`
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()`

This structure is derived from BodyStructure

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
BodyStructure |  | 0..* | BodyStructure | Specific and identified anatomical structure
active |  | 1..1 | boolean | Whether this record is in active use
location |  | 1..1 | CodeableConcept | Body site Binding: SNOMEDCTBodyStructures (preferred)
locationQualifier |  | 0..* | CodeableConcept | Body site modifier Binding: BodystructureLocationQualifier (preferred): Concepts modifying the anatomic location
patient |  | 1..1 | Reference(US Quality Core Patient) | Who this is about
Documentation for this format

#### Terminology Bindings (Differential)

Path | Status | Usage | ValueSet | Version | Source
BodyStructure.location | Base | preferred | SNOMED CT Body Structures | 📦4.0.1 | FHIR Std.
BodyStructure.locationQualifier | Base | preferred | Bodystructure Location Qualifier | 📦4.0.1 | FHIR Std.

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
BodyStructure |  | 0..* | BodyStructure | Specific and identified anatomical structure
id | Σ | 0..1 | id | Logical id of this artifact
meta | Σ | 0..1 | Meta | Metadata about the resource
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
language |  | 0..1 | code | Language of the resource content Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
text |  | 0..1 | Narrative | Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained |  | 0..* | Resource | Contained, inline Resources
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
identifier | Σ | 0..* | Identifier | Bodystructure identifier
active | ?!Σ | 1..1 | boolean | Whether this record is in active use
morphology | Σ | 0..1 | CodeableConcept | Kind of Structure Binding: SNOMEDCTMorphologicAbnormalities (example): Codes describing anatomic morphology.
location | Σ | 1..1 | CodeableConcept | Body site Binding: SNOMEDCTBodyStructures (preferred)
locationQualifier |  | 0..* | CodeableConcept | Body site modifier Binding: BodystructureLocationQualifier (preferred): Concepts modifying the anatomic location
description | Σ | 0..1 | string | Text description
image |  | 0..* | Attachment | Attached images
patient | Σ | 1..1 | Reference(US Quality Core Patient) | Who this is about
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
BodyStructure.language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
BodyStructure.morphology | Base | example | SNOMED CT Morphologic Abnormalities | 📍4.0.1 | FHIR Std.
BodyStructure.location | Base | preferred | SNOMED CT Body Structures | 📦4.0.1 | FHIR Std.
BodyStructure.locationQualifier | Base | preferred | Bodystructure Location Qualifier | 📦4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | BodyStructure | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | BodyStructure | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource | `contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()`
dom-4 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated | `contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()`
dom-5 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | BodyStructure | A resource should have narrative for robust management | `text.`div`.exists()`
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()`

This structure is derived from BodyStructure

Summary

Mandatory: 2 elements

Structures

This structure refers to these other structures:

- US Quality Core Patient (http://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-patient)

Key Elements View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
BodyStructure |  | 0..* | BodyStructure | Specific and identified anatomical structure
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
active | ?!Σ | 1..1 | boolean | Whether this record is in active use
location | Σ | 1..1 | CodeableConcept | Body site Binding: SNOMEDCTBodyStructures (preferred)
locationQualifier |  | 0..* | CodeableConcept | Body site modifier Binding: BodystructureLocationQualifier (preferred): Concepts modifying the anatomic location
patient | Σ | 1..1 | Reference(US Quality Core Patient) | Who this is about
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
BodyStructure.location | Base | preferred | SNOMED CT Body Structures | 📦4.0.1 | FHIR Std.
BodyStructure.locationQualifier | Base | preferred | Bodystructure Location Qualifier | 📦4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | BodyStructure | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | BodyStructure | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource | `contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()`
dom-4 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated | `contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()`
dom-5 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | BodyStructure | A resource should have narrative for robust management | `text.`div`.exists()`
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()`

Differential View

This structure is derived from BodyStructure

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
BodyStructure |  | 0..* | BodyStructure | Specific and identified anatomical structure
active |  | 1..1 | boolean | Whether this record is in active use
location |  | 1..1 | CodeableConcept | Body site Binding: SNOMEDCTBodyStructures (preferred)
locationQualifier |  | 0..* | CodeableConcept | Body site modifier Binding: BodystructureLocationQualifier (preferred): Concepts modifying the anatomic location
patient |  | 1..1 | Reference(US Quality Core Patient) | Who this is about
Documentation for this format

#### Terminology Bindings (Differential)

Path | Status | Usage | ValueSet | Version | Source
BodyStructure.location | Base | preferred | SNOMED CT Body Structures | 📦4.0.1 | FHIR Std.
BodyStructure.locationQualifier | Base | preferred | Bodystructure Location Qualifier | 📦4.0.1 | FHIR Std.

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
BodyStructure |  | 0..* | BodyStructure | Specific and identified anatomical structure
id | Σ | 0..1 | id | Logical id of this artifact
meta | Σ | 0..1 | Meta | Metadata about the resource
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
language |  | 0..1 | code | Language of the resource content Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
text |  | 0..1 | Narrative | Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained |  | 0..* | Resource | Contained, inline Resources
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
identifier | Σ | 0..* | Identifier | Bodystructure identifier
active | ?!Σ | 1..1 | boolean | Whether this record is in active use
morphology | Σ | 0..1 | CodeableConcept | Kind of Structure Binding: SNOMEDCTMorphologicAbnormalities (example): Codes describing anatomic morphology.
location | Σ | 1..1 | CodeableConcept | Body site Binding: SNOMEDCTBodyStructures (preferred)
locationQualifier |  | 0..* | CodeableConcept | Body site modifier Binding: BodystructureLocationQualifier (preferred): Concepts modifying the anatomic location
description | Σ | 0..1 | string | Text description
image |  | 0..* | Attachment | Attached images
patient | Σ | 1..1 | Reference(US Quality Core Patient) | Who this is about
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
BodyStructure.language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
BodyStructure.morphology | Base | example | SNOMED CT Morphologic Abnormalities | 📍4.0.1 | FHIR Std.
BodyStructure.location | Base | preferred | SNOMED CT Body Structures | 📦4.0.1 | FHIR Std.
BodyStructure.locationQualifier | Base | preferred | Bodystructure Location Qualifier | 📦4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | BodyStructure | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | BodyStructure | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource | `contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()`
dom-4 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated | `contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()`
dom-5 | error | BodyStructure | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | BodyStructure | A resource should have narrative for robust management | `text.`div`.exists()`
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()`

This structure is derived from BodyStructure

Summary

Mandatory: 2 elements

Structures

This structure refers to these other structures:

- US Quality Core Patient (http://fhir.org/guides/onc/us-quality-core/StructureDefinition/us-quality-core-patient)

Other representations of profile: CSV, Excel, Schematron