{"caseSensitive":true,"concept":[{"code":"mild","definition":"Causes mild physiological effects.","display":"Mild"},{"code":"moderate","definition":"Causes moderate physiological effects.","display":"Moderate"},{"code":"severe","definition":"Causes severe physiological effects.","display":"Severe"}],"contact":[{"telecom":[{"system":"url","value":"http://hl7.org/fhir"},{"system":"email","value":"fhir@lists.hl7.org"}]}],"content":"complete","date":"2021-01-05T10:01:24+11:00","description":"Clinical assessment of the severity of a reaction event as a whole, potentially considering multiple different manifestations.","experimental":false,"extension":[{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-wg","valueCode":"pc"},{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status","valueCode":"normative"},{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm","valueInteger":3}],"id":"reaction-event-severity","identifier":[{"system":"urn:ietf:rfc:3986","value":"urn:oid:2.16.840.1.113883.4.642.4.136"},{"system":"urn:ietf:rfc:3986","use":"old","value":"urn:oid:2.16.840.1.113883.4.642.1.126"},{"system":"urn:ietf:rfc:3986","use":"old","value":"urn:oid:2.16.840.1.113883.4.642.2.56"}],"jurisdiction":[{"coding":[{"code":"001","display":"World","system":"http://unstats.un.org/unsd/methods/m49/m49.htm"}]}],"meta":{"lastUpdated":"2026-03-29T21:54:20.327+00:00"},"name":"AllergyIntoleranceSeverity","publisher":"HL7 (FHIR Project)","resourceType":"CodeSystem","status":"active","text":{"div":"<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>","status":"generated"},"title":"Allergy Intolerance Severity","url":"http://hl7.org/fhir/reaction-event-severity","valueSet":"http://hl7.org/fhir/ValueSet/reaction-event-severity","version":"6.0.0-ballot4"}