---
type: "codesystem"
title: "Identity Assurance Level"
codesystem: "identity-assuranceLevel"
---
# Identity Assurance Level

- **Official URL**: http://hl7.org/fhir/identity-assuranceLevel
- **Version**: 6.0.0
- **Status**: active
- **Name**: IdentityAssuranceLevel
- **Title**: Identity Assurance Level
- **Publisher**: HL7 (FHIR Project)
- **Description**: The level of confidence that this link represents the same actual person, based on NIST Authentication Levels.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| level1 | Level 1 | Little or no confidence in the asserted identity's accuracy. |
| level2 | Level 2 | Some confidence in the asserted identity's accuracy. |
| level3 | Level 3 | High confidence in the asserted identity's accuracy. |
| level4 | Level 4 | Very high confidence in the asserted identity's accuracy. |

## CodeSystem XML



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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="identity-assuranceLevel"/>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="pa"/>
  </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="2"/>
  </extension>
  <url value="http://hl7.org/fhir/identity-assuranceLevel"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.657"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.641"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.2.342"/>
  </identifier>
  <version value="6.0.0"/>
  <name value="IdentityAssuranceLevel"/>
  <title value="Identity Assurance Level"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2021-01-05T10:01:24+11:00"/>
  <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="The level of confidence that this link represents the same actual person, based on NIST Authentication Levels."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/identity-assuranceLevel"/>
  <content value="complete"/>
  <concept>
    <code value="level1"/>
    <display value="Level 1"/>
    <definition value="Little or no confidence in the asserted identity's accuracy."/>
  </concept>
  <concept>
    <code value="level2"/>
    <display value="Level 2"/>
    <definition value="Some confidence in the asserted identity's accuracy."/>
  </concept>
  <concept>
    <code value="level3"/>
    <display value="Level 3"/>
    <definition value="High confidence in the asserted identity's accuracy."/>
  </concept>
  <concept>
    <code value="level4"/>
    <display value="Level 4"/>
    <definition value="Very high confidence in the asserted identity's accuracy."/>
  </concept>
</CodeSystem>
```