---
type: "codesystem"
title: "Naming System Identifier Type"
codesystem: "namingsystem-identifier-type"
---
# Naming System Identifier Type

- **Official URL**: http://hl7.org/fhir/namingsystem-identifier-type
- **Version**: 6.0.0
- **Status**: active
- **Name**: NamingSystemIdentifierType
- **Title**: Naming System Identifier Type
- **Publisher**: HL7 (FHIR Project)
- **Description**: Identifies the style of unique identifier used to identify a namespace.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| oid | OID | An ISO object identifier; e.g. 1.2.3.4.5. |
| uuid | UUID | A universally unique identifier of the form a5afddf4-e880-459b-876e-e4591b0acc11. |
| uri | URI | A uniform resource identifier (ideally a URL - uniform resource locator); e.g. http://unitsofmeasure.org. |
| iri-stem | IRI stem | An IRI string that can be prepended to the code to obtain a concept IRI for RDF applications. This should be a valid, absolute IRI as defined in RFC 3987. See [the RDF spec](rdf.html#iri-stem) for details on how this value may be used. |
| v2csmnemonic | V2CSMNemonic | A short string published by HL7 for use in the V2 family of standsrds to idenfify a code system in the V12 coded data types CWE, CNE, and CF. The code values are also published by HL7 at http://www.hl7.org/Special/committees/vocab/table_0396/index.cfm |
| other | Other | Some other type of unique identifier; e.g. HL7-assigned reserved string such as LN for LOINC. |

## CodeSystem XML



```xml
<?xml version="1.0" encoding="UTF-8"?>

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="namingsystem-identifier-type"/>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="vocab"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="normative"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1"/>
  </extension>
  <url value="http://hl7.org/fhir/namingsystem-identifier-type"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.493"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.486"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.2.293"/>
  </identifier>
  <version value="6.0.0"/>
  <name value="NamingSystemIdentifierType"/>
  <title value="Naming System Identifier Type"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2023-01-26T15:53:48Z"/>
  <publisher value="HL7 (FHIR Project)"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="fhir@lists.hl7.org"/>
    </telecom>
  </contact>
  <description value="Identifies the style of unique identifier used to identify a namespace."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/namingsystem-identifier-type"/>
  <content value="complete"/>
  <concept>
    <code value="oid"/>
    <display value="OID"/>
    <definition value="An ISO object identifier; e.g. 1.2.3.4.5."/>
  </concept>
  <concept>
    <code value="uuid"/>
    <display value="UUID"/>
    <definition value="A universally unique identifier of the form a5afddf4-e880-459b-876e-e4591b0acc11."/>
  </concept>
  <concept>
    <code value="uri"/>
    <display value="URI"/>
    <definition value="A uniform resource identifier (ideally a URL - uniform resource locator); e.g. http://unitsofmeasure.org."/>
  </concept>
  <concept>
    <code value="iri-stem"/>
    <display value="IRI stem"/>
    <definition value="An IRI string that can be prepended to the code to obtain a concept IRI for RDF applications. This should be a valid, absolute IRI as defined in RFC 3987. See [the RDF spec](rdf.html#iri-stem) for details on how this value may be used."/>
  </concept>
  <concept>
    <code value="v2csmnemonic"/>
    <display value="V2CSMNemonic"/>
    <definition value="A short string published by HL7 for use in the V2 family of standsrds to idenfify a code system in the V12 coded data types CWE, CNE, and CF. The code values are also published by HL7 at http://www.hl7.org/Special/committees/vocab/table_0396/index.cfm"/>
  </concept>
  <concept>
    <code value="other"/>
    <display value="Other"/>
    <definition value="Some other type of unique identifier; e.g. HL7-assigned reserved string such as LN for LOINC."/>
  </concept>
</CodeSystem>
```