description: Indicates that the given code is directly referenced by artifact logic (e.g. as a [direct-reference code](https://cql.hl7.org/02-authorsguide.html#code) in CQL). Terminology dependencies used in logic can be collected and reported, typically using the relatedArtifact element with a type of `depends-on`. However, direct-reference codes cannot be represented in the relatedArtifact element, so this extension provides a means to support communicating direct-reference code dependencies of knowledge artifacts. As with value set dependencies, direct-reference codes may be the terminology target of a data requirement.
package_name: hl7.fhir.uv.extensions.r3
derivation: constraint
name: DirectReferenceCode
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/cqf-directReferenceCode'}
    index: 1
  value:
    choices: [valueCoding]
    index: 3
  valueCoding: {type: Coding, choiceOf: value, index: 4}
package_version: 5.3.0-ballot
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/cqf-directReferenceCode
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 5.3.0-ballot
required: [valueCoding, value]