# US Core Individual Sex Extension - US Core Implementation Guide v9.0.0

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

## Extension: US Core Individual Sex Extension 

| | | |
| :--- | :--- | :--- |
| *Official URL*:http://hl7.org/fhir/us/core/StructureDefinition/us-core-individual-sex | *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*:USCoreIndividualSexExtension |
| *Other Identifiers:*OID:2.16.840.1.113883.4.642.40.2.42.33 | | |

USCDI includes a data element for Sex, intended to support the exchange of a recorded sex value. This extension aligns with the USCDI definition of Sex: "Documentation of a specific instance of sex." It enables systems to share the sex value as it was documented in a particular context. Systems choosing to record sources of information should use the [Provenance resource](element-level-provenance.md).

**Context of Use**

**Usage info**

**Usages:**

* Use this Extension: [US Core Patient Profile](StructureDefinition-us-core-patient.md)
* Examples for this Extension: [Patient/child-example](Patient-child-example.md), [Patient/deceased-example](Patient-deceased-example.md), [Patient/example](Patient-example.md) and [Patient/infant-example](Patient-infant-example.md)

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

**Changes since version 8.0.1:**

* The resource metadata has changed (copyright)

### 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-us-core-individual-sex.csv), [Excel](StructureDefinition-us-core-individual-sex.xlsx), [Schematron](StructureDefinition-us-core-individual-sex.sch) 

#### Terminology Bindings

#### Constraints



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "us-core-individual-sex",
  "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/us-core-individual-sex",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.4.642.40.2.42.33"
  }],
  "version" : "9.0.0",
  "name" : "USCoreIndividualSexExtension",
  "title" : "US Core Individual Sex Extension",
  "status" : "active",
  "date" : "2025-04-22",
  "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" : "USCDI includes a data element for Sex, intended to support the exchange of a recorded sex value. This extension aligns with the USCDI definition of Sex: \"Documentation of a specific instance of sex.\" It enables systems to share the sex value as it was documented in a particular context.  Systems choosing to record sources of information should use the [Provenance resource](element-level-provenance.html).",
  "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" : "Patient"
  },
  {
    "type" : "element",
    "expression" : "RelatedPerson"
  },
  {
    "type" : "element",
    "expression" : "Person"
  },
  {
    "type" : "element",
    "expression" : "Practitioner"
  },
  {
    "type" : "element",
    "expression" : "FamilyMemberHistory"
  }],
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "Extension",
      "path" : "Extension",
      "definition" : "The US Core Individual Sex Extension is used to reflect the documentation of a person's sex. It aligns with the C-CDA Sex Observation (LOINC 46098-0).",
      "min" : 0,
      "max" : "1",
      "isModifier" : false
    },
    {
      "id" : "Extension.url",
      "path" : "Extension.url",
      "fixedUri" : "http://hl7.org/fhir/us/core/StructureDefinition/us-core-individual-sex"
    },
    {
      "id" : "Extension.value[x]",
      "path" : "Extension.value[x]",
      "min" : 1,
      "max" : "1",
      "type" : [{
        "code" : "Coding"
      }],
      "binding" : {
        "strength" : "extensible",
        "description" : "Federal Administrative Sex",
        "valueSet" : "http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1021.121"
      }
    }]
  }
}

```
