# US Core USCDI Requirement Extension - US Core Implementation Guide v9.0.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **US Core USCDI Requirement Extension**

## Extension: US Core USCDI Requirement Extension 

| | | |
| :--- | :--- | :--- |
| *Official URL*:http://hl7.org/fhir/us/core/StructureDefinition/uscdi-requirement | *Version*:9.0.0 | |
| * Standards status: *[Trial-use](http://hl7.org/fhir/R4/versions.html#std-process) | [Maturity Level](changes-between-versions.md#us-core-maturity-levels): 5 | *Computable Name*:USCDIRequirement |
| *Other Identifiers:*OID:2.16.840.1.113883.4.642.40.2.42.67 | | |

**This extension is only used in the US Core Implementation Guide's Profile StructureDefinition elements.** It flags elements that are **Additional** USCDI Requirements for certified systems. In other words, elements that are not marked as Must Support but are required for Office of the National Coordinator for Health Information Technology (ONC) Health IT certification testing. See the [Conformance page](general-requirements.md) for more information.

**Context of Use**

**Usage info**

**Usages:**

* Examples for this Extension: [USCoreAllergyIntolerance](StructureDefinition-us-core-allergyintolerance.md), [USCoreCareExperiencePreferenceProfile](StructureDefinition-us-core-care-experience-preference.md), [USCoreCarePlanProfile](StructureDefinition-us-core-careplan.md), [USCoreConditionEncounterDiagnosisProfile](StructureDefinition-us-core-condition-encounter-diagnosis.md)... Show 17 more, [USCoreConditionProblemsHealthConcernsProfile](StructureDefinition-us-core-condition-problems-health-concerns.md), [USCoreDeviceProfile](StructureDefinition-us-core-device.md), [USCoreDocumentReferenceProfile](StructureDefinition-us-core-documentreference.md), [USCoreEncounterProfile](StructureDefinition-us-core-encounter.md), [USCoreFamilyMemberHistoryProfile](StructureDefinition-us-core-familymemberhistory.md), [USCoreMedicationRequestProfile](StructureDefinition-us-core-medicationrequest.md), [USCoreLaboratoryResultObservationProfile](StructureDefinition-us-core-observation-lab.md), [USCoreObservationOccupationProfile](StructureDefinition-us-core-observation-occupation.md), [USCoreObservationPregnancyIntentProfile](StructureDefinition-us-core-observation-pregnancyintent.md), [USCoreObservationPregnancyStatusProfile](StructureDefinition-us-core-observation-pregnancystatus.md), [USCoreObservationScreeningAssessmentProfile](StructureDefinition-us-core-observation-screening-assessment.md), [USCorePatientProfile](StructureDefinition-us-core-patient.md), [USCoreProcedureProfile](StructureDefinition-us-core-procedure.md), [USCoreServiceRequestProfile](StructureDefinition-us-core-servicerequest.md), [USCoreSimpleObservationProfile](StructureDefinition-us-core-simple-observation.md), [USCoreSpecimenProfile](StructureDefinition-us-core-specimen.md) and [USCoreTreatmentInterventionPreferenceProfile](StructureDefinition-us-core-treatment-intervention-preference.md)

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/hl7.fhir.us.core|current/StructureDefinition/uscdi-requirement)

**Changes since version 8.0.1:**

* The resource metadata has changed (description, copyright)

* The data elements list has changed

* One or more text definitions, invariants or bindings have changed

### Formal Views of Extension Content

 [Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work](http://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#structure-definitions). 

 

Other representations of profile: [CSV](StructureDefinition-uscdi-requirement.csv), [Excel](StructureDefinition-uscdi-requirement.xlsx), [Schematron](StructureDefinition-uscdi-requirement.sch) 

#### Constraints



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "uscdi-requirement",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 5
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "cgp"
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode" : "trial-use",
    "_valueCode" : {
      "extension" : [{
        "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueCanonical" : "http://hl7.org/fhir/us/core/ImplementationGuide/hl7.fhir.us.core"
      }]
    }
  }],
  "url" : "http://hl7.org/fhir/us/core/StructureDefinition/uscdi-requirement",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.4.642.40.2.42.67"
  }],
  "version" : "9.0.0",
  "name" : "USCDIRequirement",
  "title" : "US Core USCDI Requirement Extension",
  "status" : "active",
  "date" : "2023-04-03",
  "publisher" : "HL7 International / Cross-Group Projects",
  "contact" : [{
    "name" : "HL7 International / Cross-Group Projects",
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/cgp"
    },
    {
      "system" : "email",
      "value" : "cgp@lists.HL7.org"
    }]
  }],
  "description" : "**This extension is only used in the US Core Implementation Guide's Profile StructureDefinition elements.**  It flags elements that are *Additional* USCDI Requirements for certified systems. In other words, elements that are not marked as Must Support but are required for Office of the National Coordinator for Health Information Technology (ONC) Health IT certification testing. See the [Conformance page](general-requirements.html) for more information.",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "urn:iso:std:iso:3166",
      "code" : "US"
    }]
  }],
  "fhirVersion" : "4.0.1",
  "mapping" : [{
    "identity" : "rim",
    "uri" : "http://hl7.org/v3",
    "name" : "RIM Mapping"
  }],
  "kind" : "complex-type",
  "abstract" : false,
  "context" : [{
    "type" : "element",
    "expression" : "ElementDefinition"
  }],
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "Extension",
      "path" : "Extension",
      "short" : "USCDI Requirement Flag: ONLY USED FOR US Core Profile StructureDefinitions",
      "definition" : "This extension flags elements that are *Additional* USCDI Requirements for certified systems. In other words, elements that are not marked as Must Support but are required for Office of the National Coordinator for Health Information Technology (ONC) Health IT certification testing. See the [Conformance page](general-requirements.html) for more information.",
      "min" : 0,
      "max" : "1",
      "isModifier" : false
    },
    {
      "id" : "Extension.url",
      "path" : "Extension.url",
      "fixedUri" : "http://hl7.org/fhir/us/core/StructureDefinition/uscdi-requirement"
    },
    {
      "id" : "Extension.value[x]",
      "path" : "Extension.value[x]",
      "min" : 1,
      "max" : "1",
      "type" : [{
        "code" : "boolean"
      }]
    }]
  }
}

```
