---
type: "codesystem"
title: "Allergy Intolerance Type"
codesystem: "allergy-intolerance-type"
---
# Allergy Intolerance Type

- **Official URL**: http://hl7.org/fhir/allergy-intolerance-type
- **Version**: 6.0.0
- **Status**: active
- **Name**: AllergyIntoleranceType
- **Title**: Allergy Intolerance Type
- **Publisher**: HL7 (FHIR Project)
- **Description**: Identification of the underlying physiological mechanism for a Reaction Risk.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| allergy | Allergy | A propensity for hypersensitive reaction(s) to a substance.  These reactions are most typically type I hypersensitivity, plus other "allergy-like" reactions, including pseudoallergy. |
| intolerance | Intolerance | A propensity for adverse reactions to a substance that is judged to be not allergic or "allergy-like".  These reactions are typically (but not necessarily) non-immune.  They are to some degree idiosyncratic and/or patient-specific (i.e. are not a reaction that is expected to occur with most or all patients given similar circumstances). |

## CodeSystem XML



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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="allergy-intolerance-type"/>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="pc"/>
  </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="3"/>
  </extension>
  <url value="http://hl7.org/fhir/allergy-intolerance-type"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.132"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.122"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.2.52"/>
  </identifier>
  <version value="6.0.0"/>
  <name value="AllergyIntoleranceType"/>
  <title value="Allergy Intolerance Type"/>
  <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="Identification of the underlying physiological mechanism for a Reaction Risk."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/allergy-intolerance-type"/>
  <content value="complete"/>
  <concept>
    <code value="allergy"/>
    <display value="Allergy"/>
    <definition value="A propensity for hypersensitive reaction(s) to a substance.  These reactions are most typically type I hypersensitivity, plus other &quot;allergy-like&quot; reactions, including pseudoallergy."/>
  </concept>
  <concept>
    <code value="intolerance"/>
    <display value="Intolerance"/>
    <definition value="A propensity for adverse reactions to a substance that is judged to be not allergic or &quot;allergy-like&quot;.  These reactions are typically (but not necessarily) non-immune.  They are to some degree idiosyncratic and/or patient-specific (i.e. are not a reaction that is expected to occur with most or all patients given similar circumstances)."/>
  </concept>
</CodeSystem>
```