AllergyIntolerance Certainty CodeSystem

{
  "description" : "AllergyIntoleranceCertainty",
  "date" : "2026-05-16T18:32:05+10:00",
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    "lastUpdated" : "2023-01-31T07:07:38.434+11:00",
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  "publisher" : "HL7 International / Patient Care",
  "jurisdiction" : [ {
    "coding" : [ {
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "code" : "001"
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  "content" : "complete",
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  "name" : "AllergyIntoleranceCertainty",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "AllergyIntolerance Certainty CodeSystem",
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  "status" : "active",
  "id" : "07e028a5-fa04-41e2-826e-2c8557e54bcf",
  "url" : "http://hl7.org/fhir/reaction-event-certainty",
  "identifier" : [ {
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    "value" : "urn:oid:2.16.840.1.113883.4.642.1.1276"
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  "caseSensitive" : true,
  "version" : "5.3.0",
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  "text" : {
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p class=\"res-header-id\"><b>Generated Narrative: CodeSystem reaction-event-certainty</b></p><a name=\"reaction-event-certainty\"> </a><a name=\"hcreaction-event-certainty\"> </a><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Last updated: 2023-01-31 07:07:38+1100</p><p style=\"margin-bottom: 0px\">Profile: <a href=\"http://hl7.org/fhir/R5/shareablecodesystem.html\">Shareable CodeSystem</a></p></div><p>This case-sensitive code system <code>http://hl7.org/fhir/reaction-event-certainty</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\">unlikely<a name=\"reaction-event-certainty-unlikely\"> </a></td><td>Unlikely</td><td>There is a low level of clinical certainty that the reaction was caused by the identified substance.</td></tr><tr><td style=\"white-space:nowrap\">likely<a name=\"reaction-event-certainty-likely\"> </a></td><td>Likely</td><td>There is a high level of clinical certainty that the reaction was caused by the identified substance.</td></tr><tr><td style=\"white-space:nowrap\">confirmed<a name=\"reaction-event-certainty-confirmed\"> </a></td><td>Confirmed</td><td>There is a very high level of clinical certainty that the reaction was due to the identified substance, which may include clinical evidence by testing or rechallenge.</td></tr><tr><td style=\"white-space:nowrap\">unknown<a name=\"reaction-event-certainty-unknown\"> </a></td><td>Unknown</td><td>The clinical certainty that the reaction was caused by the identified substance is unknown.  It is an explicit assertion that certainty is not known.</td></tr></table></div>",
    "status" : "generated"
  }
}