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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="reaction-event-severity"/>
  <meta>
    <lastUpdated value="2026-03-31T18:55:04.283+00:00"/>
  </meta>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p class="res-header-id">
        <b>Generated Narrative: CodeSystem reaction-event-severity</b>
      </p>
      <a name="reaction-event-severity"> </a>
      <a name="hcreaction-event-severity"> </a>
      <p>This case-sensitive code system 
        <code>http://hl7.org/fhir/reaction-event-severity</code> defines the following codes:
      </p>
      <table class="codes">
        <tr>
          <td style="white-space:nowrap">
            <b>Code</b>
          </td>
          <td>
            <b>Display</b>
          </td>
          <td>
            <b>Definition</b>
          </td>
        </tr>
        <tr>
          <td style="white-space:nowrap">mild
            <a name="reaction-event-severity-mild"> </a>
          </td>
          <td>Mild</td>
          <td>Causes mild physiological effects.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">moderate
            <a name="reaction-event-severity-moderate"> </a>
          </td>
          <td>Moderate</td>
          <td>Causes moderate physiological effects.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">severe
            <a name="reaction-event-severity-severe"> </a>
          </td>
          <td>Severe</td>
          <td>Causes severe physiological effects.</td>
        </tr>
      </table>
    </div>
  </text>
  <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/reaction-event-severity"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.136"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.126"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.2.56"/>
  </identifier>
  <version value="6.0.0-ballot4"/>
  <name value="AllergyIntoleranceSeverity"/>
  <title value="Allergy Intolerance Severity"/>
  <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="Clinical assessment of the severity of a reaction event as a whole, potentially considering multiple different manifestations."/>
  <jurisdiction>
    <coding>
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
      <code value="001"/>
      <display value="World"/>
    </coding>
  </jurisdiction>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/reaction-event-severity"/>
  <content value="complete"/>
  <concept>
    <code value="mild"/>
    <display value="Mild"/>
    <definition value="Causes mild physiological effects."/>
  </concept>
  <concept>
    <code value="moderate"/>
    <display value="Moderate"/>
    <definition value="Causes moderate physiological effects."/>
  </concept>
  <concept>
    <code value="severe"/>
    <display value="Severe"/>
    <definition value="Causes severe physiological effects."/>
  </concept>
</CodeSystem>