HL7 v2.9.1 Vocabulary
0.2.0 - ci-build

HL7 v2.9.1 Vocabulary, published by HL7/FO. This guide is not an authorized publication; it is the continuous build for version 0.2.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/frankoemig/hl7.v2.terminology.v291/ and changes regularly. See the Directory of published versions

## Resource Profile: V2CodeSystem

Official URL: http://terminology.hl7.org/v2plusvocab/StructureDefinition/V2CodeSystem | Version:
Draft as of 2026-03-13 | Computable Name: V2CodeSystem

Profile for CodeSystem instances generated in this guide.

Usages:

- This Profile is not used by any profiles in this Implementation Guide

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
--- | --- | --- | --- | ---
CodeSystem | C | 0..* | CodeSystem | Declares the existence of and describes a code system or code system supplement Constraints: csd-0, csd-1
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
url | S Σ | 1..1 | uri | Canonical identifier for this code system, represented as a URI (globally unique) (Coding.system)
identifier | S Σ | 0..* | Identifier | Additional identifier for the code system (business identifier)
version | S Σ | 1..1 | string | Business version of the code system (Coding.version)
name | S Σ C | 1..1 | string | Name for this code system (computer friendly)
title | S Σ | 1..1 | string | Name for this code system (human friendly)
status | ?!S Σ | 1..1 | code | draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
content | Σ | 1..1 | code | not-present | example | fragment | complete | supplement Binding: CodeSystemContentMode (required): The extent of the content of the code system (the concepts and codes it defines) are represented in a code system resource.
concept | S | 1..* | BackboneElement | Concepts in the code system
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Code that identifies concept
display | S | 1..1 | string | Text to display to the user
definition | S | 0..1 | string | Formal definition
designation | S | 0..* | BackboneElement | Additional representations for the concept
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
value |  | 1..1 | string | The text value for this designation
property | S | 0..* | BackboneElement | Property value for the concept
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Reference to CodeSystem.property.code
value[x] |  | 1..1 |  | Value of the property for this concept
valueCode |  |  | code |
valueCoding |  |  | Coding |
valueString |  |  | string |
valueInteger |  |  | integer |
valueBoolean |  |  | boolean |
valueDateTime |  |  | dateTime |
valueDecimal |  |  | decimal |
concept | S | 0..* | See concept (CodeSystem) | Child Concepts (is-a/contains/categorizes)
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
CodeSystem.status | Base | required | PublicationStatus | 📍4.0.1 | FHIR Std.
CodeSystem.content | Base | required | CodeSystemContentMode | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
csd-0 | warning | CodeSystem | Name should be usable as an identifier for the module by machine processing applications such as code generation | `name.matches('[A-Z]([A-Za-z0-9_]){0,254}')`
csd-1 | error | CodeSystem | Within a code system definition, all the codes SHALL be unique | `concept.code.combine($this.descendants().concept.code).isDistinct()`
dom-2 | error | CodeSystem | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | CodeSystem | 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 | CodeSystem | 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 | CodeSystem | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | CodeSystem | 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 CodeSystem

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
CodeSystem |  | 0..* | CodeSystem | Declares the existence of and describes a code system or code system supplement
url | S | 1..1 | uri | Canonical identifier for this code system, represented as a URI (globally unique) (Coding.system)
identifier | S | 0..* | Identifier | Additional identifier for the code system (business identifier)
version | S | 1..1 | string | Business version of the code system (Coding.version)
name | S | 1..1 | string | Name for this code system (computer friendly)
title | S | 1..1 | string | Name for this code system (human friendly)
status | S | 1..1 | code | draft | active | retired | unknown
concept | S | 1..* | BackboneElement | Concepts in the code system
code | S | 1..1 | code | Code that identifies concept
display | S | 1..1 | string | Text to display to the user
definition | S | 0..1 | string | Formal definition
designation | S | 0..* | BackboneElement | Additional representations for the concept
property | S | 0..* | BackboneElement | Property value for the concept
code | S | 1..1 | code | Reference to CodeSystem.property.code
concept | S | 0..* |  | Child Concepts (is-a/contains/categorizes)
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
CodeSystem | C | 0..* | CodeSystem | Declares the existence of and describes a code system or code system supplement Constraints: csd-0, csd-1
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
url | S Σ | 1..1 | uri | Canonical identifier for this code system, represented as a URI (globally unique) (Coding.system)
identifier | S Σ | 0..* | Identifier | Additional identifier for the code system (business identifier)
version | S Σ | 1..1 | string | Business version of the code system (Coding.version)
name | S Σ C | 1..1 | string | Name for this code system (computer friendly)
title | S Σ | 1..1 | string | Name for this code system (human friendly)
status | ?!S Σ | 1..1 | code | draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
experimental | Σ | 0..1 | boolean | For testing purposes, not real usage
date | Σ | 0..1 | dateTime | Date last changed
publisher | Σ | 0..1 | string | Name of the publisher (organization or individual)
contact | Σ | 0..* | ContactDetail | Contact details for the publisher
description |  | 0..1 | markdown | Natural language description of the code system
useContext | Σ | 0..* | UsageContext | The context that the content is intended to support
jurisdiction | Σ | 0..* | CodeableConcept | Intended jurisdiction for code system (if applicable) Binding: Jurisdiction ValueSet (extensible): Countries and regions within which this artifact is targeted for use.
purpose |  | 0..1 | markdown | Why this code system is defined
copyright |  | 0..1 | markdown | Use and/or publishing restrictions
caseSensitive | Σ | 0..1 | boolean | If code comparison is case sensitive
valueSet | Σ | 0..1 | canonical(ValueSet) | Canonical reference to the value set with entire code system
hierarchyMeaning | Σ | 0..1 | code | grouped-by | is-a | part-of | classified-with Binding: CodeSystemHierarchyMeaning (required): The meaning of the hierarchy of concepts in a code system.
compositional | Σ | 0..1 | boolean | If code system defines a compositional grammar
versionNeeded | Σ | 0..1 | boolean | If definitions are not stable
content | Σ | 1..1 | code | not-present | example | fragment | complete | supplement Binding: CodeSystemContentMode (required): The extent of the content of the code system (the concepts and codes it defines) are represented in a code system resource.
supplements | Σ | 0..1 | canonical(CodeSystem) | Canonical URL of Code System this adds designations and properties to
count | Σ | 0..1 | unsignedInt | Total concepts in the code system
filter | Σ | 0..* | BackboneElement | Filter that can be used in a value set
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | Σ | 1..1 | code | Code that identifies the filter
description | Σ | 0..1 | string | How or why the filter is used
operator | Σ | 1..* | code | = | is-a | descendent-of | is-not-a | regex | in | not-in | generalizes | exists Binding: FilterOperator (required): The kind of operation to perform as a part of a property based filter.
value | Σ | 1..1 | string | What to use for the value
property | Σ | 0..* | BackboneElement | Additional information supplied about each concept
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | Σ | 1..1 | code | Identifies the property on the concepts, and when referred to in operations
uri | Σ | 0..1 | uri | Formal identifier for the property
description | Σ | 0..1 | string | Why the property is defined, and/or what it conveys
type | Σ | 1..1 | code | code | Coding | string | integer | boolean | dateTime | decimal Binding: PropertyType (required): The type of a property value.
concept | S | 1..* | BackboneElement | Concepts in the code system
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Code that identifies concept
display | S | 1..1 | string | Text to display to the user
definition | S | 0..1 | string | Formal definition
designation | S | 0..* | BackboneElement | Additional representations for the concept
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
language |  | 0..1 | code | Human language of the designation Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
use |  | 0..1 | Coding | Details how this designation would be used Binding: DesignationUse (extensible): Details of how a designation would be used.
value |  | 1..1 | string | The text value for this designation
property | S | 0..* | BackboneElement | Property value for the concept
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Reference to CodeSystem.property.code
value[x] |  | 1..1 |  | Value of the property for this concept
valueCode |  |  | code |
valueCoding |  |  | Coding |
valueString |  |  | string |
valueInteger |  |  | integer |
valueBoolean |  |  | boolean |
valueDateTime |  |  | dateTime |
valueDecimal |  |  | decimal |
concept | S | 0..* | See concept (CodeSystem) | Child Concepts (is-a/contains/categorizes)
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
CodeSystem.language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
CodeSystem.status | Base | required | PublicationStatus | 📍4.0.1 | FHIR Std.
CodeSystem.jurisdiction | Base | extensible | Jurisdiction | 📍4.0.1 | FHIR Std.
CodeSystem.hierarchyMeaning | Base | required | CodeSystemHierarchyMeaning | 📍4.0.1 | FHIR Std.
CodeSystem.content | Base | required | CodeSystemContentMode | 📍4.0.1 | FHIR Std.
CodeSystem.filter.operator | Base | required | FilterOperator | 📍4.0.1 | FHIR Std.
CodeSystem.property.​type | Base | required | PropertyType | 📍4.0.1 | FHIR Std.
CodeSystem.concept.designation.​language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
CodeSystem.concept.designation.​use | Base | extensible | Designation Use | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
csd-0 | warning | CodeSystem | Name should be usable as an identifier for the module by machine processing applications such as code generation | `name.matches('[A-Z]([A-Za-z0-9_]){0,254}')`
csd-1 | error | CodeSystem | Within a code system definition, all the codes SHALL be unique | `concept.code.combine($this.descendants().concept.code).isDistinct()`
dom-2 | error | CodeSystem | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | CodeSystem | 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 | CodeSystem | 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 | CodeSystem | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | CodeSystem | 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 CodeSystem

Summary

Mandatory: 6 elements
Must-Support: 14 elements

Key Elements View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
CodeSystem | C | 0..* | CodeSystem | Declares the existence of and describes a code system or code system supplement Constraints: csd-0, csd-1
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
url | S Σ | 1..1 | uri | Canonical identifier for this code system, represented as a URI (globally unique) (Coding.system)
identifier | S Σ | 0..* | Identifier | Additional identifier for the code system (business identifier)
version | S Σ | 1..1 | string | Business version of the code system (Coding.version)
name | S Σ C | 1..1 | string | Name for this code system (computer friendly)
title | S Σ | 1..1 | string | Name for this code system (human friendly)
status | ?!S Σ | 1..1 | code | draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
content | Σ | 1..1 | code | not-present | example | fragment | complete | supplement Binding: CodeSystemContentMode (required): The extent of the content of the code system (the concepts and codes it defines) are represented in a code system resource.
concept | S | 1..* | BackboneElement | Concepts in the code system
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Code that identifies concept
display | S | 1..1 | string | Text to display to the user
definition | S | 0..1 | string | Formal definition
designation | S | 0..* | BackboneElement | Additional representations for the concept
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
value |  | 1..1 | string | The text value for this designation
property | S | 0..* | BackboneElement | Property value for the concept
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Reference to CodeSystem.property.code
value[x] |  | 1..1 |  | Value of the property for this concept
valueCode |  |  | code |
valueCoding |  |  | Coding |
valueString |  |  | string |
valueInteger |  |  | integer |
valueBoolean |  |  | boolean |
valueDateTime |  |  | dateTime |
valueDecimal |  |  | decimal |
concept | S | 0..* | See concept (CodeSystem) | Child Concepts (is-a/contains/categorizes)
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
CodeSystem.status | Base | required | PublicationStatus | 📍4.0.1 | FHIR Std.
CodeSystem.content | Base | required | CodeSystemContentMode | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
csd-0 | warning | CodeSystem | Name should be usable as an identifier for the module by machine processing applications such as code generation | `name.matches('[A-Z]([A-Za-z0-9_]){0,254}')`
csd-1 | error | CodeSystem | Within a code system definition, all the codes SHALL be unique | `concept.code.combine($this.descendants().concept.code).isDistinct()`
dom-2 | error | CodeSystem | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | CodeSystem | 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 | CodeSystem | 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 | CodeSystem | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | CodeSystem | 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 CodeSystem

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
CodeSystem |  | 0..* | CodeSystem | Declares the existence of and describes a code system or code system supplement
url | S | 1..1 | uri | Canonical identifier for this code system, represented as a URI (globally unique) (Coding.system)
identifier | S | 0..* | Identifier | Additional identifier for the code system (business identifier)
version | S | 1..1 | string | Business version of the code system (Coding.version)
name | S | 1..1 | string | Name for this code system (computer friendly)
title | S | 1..1 | string | Name for this code system (human friendly)
status | S | 1..1 | code | draft | active | retired | unknown
concept | S | 1..* | BackboneElement | Concepts in the code system
code | S | 1..1 | code | Code that identifies concept
display | S | 1..1 | string | Text to display to the user
definition | S | 0..1 | string | Formal definition
designation | S | 0..* | BackboneElement | Additional representations for the concept
property | S | 0..* | BackboneElement | Property value for the concept
code | S | 1..1 | code | Reference to CodeSystem.property.code
concept | S | 0..* |  | Child Concepts (is-a/contains/categorizes)
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
CodeSystem | C | 0..* | CodeSystem | Declares the existence of and describes a code system or code system supplement Constraints: csd-0, csd-1
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
url | S Σ | 1..1 | uri | Canonical identifier for this code system, represented as a URI (globally unique) (Coding.system)
identifier | S Σ | 0..* | Identifier | Additional identifier for the code system (business identifier)
version | S Σ | 1..1 | string | Business version of the code system (Coding.version)
name | S Σ C | 1..1 | string | Name for this code system (computer friendly)
title | S Σ | 1..1 | string | Name for this code system (human friendly)
status | ?!S Σ | 1..1 | code | draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
experimental | Σ | 0..1 | boolean | For testing purposes, not real usage
date | Σ | 0..1 | dateTime | Date last changed
publisher | Σ | 0..1 | string | Name of the publisher (organization or individual)
contact | Σ | 0..* | ContactDetail | Contact details for the publisher
description |  | 0..1 | markdown | Natural language description of the code system
useContext | Σ | 0..* | UsageContext | The context that the content is intended to support
jurisdiction | Σ | 0..* | CodeableConcept | Intended jurisdiction for code system (if applicable) Binding: Jurisdiction ValueSet (extensible): Countries and regions within which this artifact is targeted for use.
purpose |  | 0..1 | markdown | Why this code system is defined
copyright |  | 0..1 | markdown | Use and/or publishing restrictions
caseSensitive | Σ | 0..1 | boolean | If code comparison is case sensitive
valueSet | Σ | 0..1 | canonical(ValueSet) | Canonical reference to the value set with entire code system
hierarchyMeaning | Σ | 0..1 | code | grouped-by | is-a | part-of | classified-with Binding: CodeSystemHierarchyMeaning (required): The meaning of the hierarchy of concepts in a code system.
compositional | Σ | 0..1 | boolean | If code system defines a compositional grammar
versionNeeded | Σ | 0..1 | boolean | If definitions are not stable
content | Σ | 1..1 | code | not-present | example | fragment | complete | supplement Binding: CodeSystemContentMode (required): The extent of the content of the code system (the concepts and codes it defines) are represented in a code system resource.
supplements | Σ | 0..1 | canonical(CodeSystem) | Canonical URL of Code System this adds designations and properties to
count | Σ | 0..1 | unsignedInt | Total concepts in the code system
filter | Σ | 0..* | BackboneElement | Filter that can be used in a value set
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | Σ | 1..1 | code | Code that identifies the filter
description | Σ | 0..1 | string | How or why the filter is used
operator | Σ | 1..* | code | = | is-a | descendent-of | is-not-a | regex | in | not-in | generalizes | exists Binding: FilterOperator (required): The kind of operation to perform as a part of a property based filter.
value | Σ | 1..1 | string | What to use for the value
property | Σ | 0..* | BackboneElement | Additional information supplied about each concept
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | Σ | 1..1 | code | Identifies the property on the concepts, and when referred to in operations
uri | Σ | 0..1 | uri | Formal identifier for the property
description | Σ | 0..1 | string | Why the property is defined, and/or what it conveys
type | Σ | 1..1 | code | code | Coding | string | integer | boolean | dateTime | decimal Binding: PropertyType (required): The type of a property value.
concept | S | 1..* | BackboneElement | Concepts in the code system
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Code that identifies concept
display | S | 1..1 | string | Text to display to the user
definition | S | 0..1 | string | Formal definition
designation | S | 0..* | BackboneElement | Additional representations for the concept
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
language |  | 0..1 | code | Human language of the designation Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
use |  | 0..1 | Coding | Details how this designation would be used Binding: DesignationUse (extensible): Details of how a designation would be used.
value |  | 1..1 | string | The text value for this designation
property | S | 0..* | BackboneElement | Property value for the concept
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
code | S | 1..1 | code | Reference to CodeSystem.property.code
value[x] |  | 1..1 |  | Value of the property for this concept
valueCode |  |  | code |
valueCoding |  |  | Coding |
valueString |  |  | string |
valueInteger |  |  | integer |
valueBoolean |  |  | boolean |
valueDateTime |  |  | dateTime |
valueDecimal |  |  | decimal |
concept | S | 0..* | See concept (CodeSystem) | Child Concepts (is-a/contains/categorizes)
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
CodeSystem.language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
CodeSystem.status | Base | required | PublicationStatus | 📍4.0.1 | FHIR Std.
CodeSystem.jurisdiction | Base | extensible | Jurisdiction | 📍4.0.1 | FHIR Std.
CodeSystem.hierarchyMeaning | Base | required | CodeSystemHierarchyMeaning | 📍4.0.1 | FHIR Std.
CodeSystem.content | Base | required | CodeSystemContentMode | 📍4.0.1 | FHIR Std.
CodeSystem.filter.operator | Base | required | FilterOperator | 📍4.0.1 | FHIR Std.
CodeSystem.property.​type | Base | required | PropertyType | 📍4.0.1 | FHIR Std.
CodeSystem.concept.designation.​language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
CodeSystem.concept.designation.​use | Base | extensible | Designation Use | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
csd-0 | warning | CodeSystem | Name should be usable as an identifier for the module by machine processing applications such as code generation | `name.matches('[A-Z]([A-Za-z0-9_]){0,254}')`
csd-1 | error | CodeSystem | Within a code system definition, all the codes SHALL be unique | `concept.code.combine($this.descendants().concept.code).isDistinct()`
dom-2 | error | CodeSystem | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | CodeSystem | 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 | CodeSystem | 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 | CodeSystem | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | CodeSystem | 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 CodeSystem

Summary

Mandatory: 6 elements
Must-Support: 14 elements

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