<?xml version="1.0" encoding="UTF-8"?><CodeSystem xmlns="http://hl7.org/fhir"><id value="reaction-event-certainty"/><meta><lastUpdated value="2020-04-09T21:10:28.568+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-certainty</b></p><a name="reaction-event-certainty"> </a><a name="hcreaction-event-certainty"> </a><a name="reaction-event-certainty-en-US"> </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: 2020-04-09 21:10:28+0000</p></div><p>This case-sensitive code system <code>http://terminology.hl7.org/CodeSystem/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></text><url value="http://terminology.hl7.org/CodeSystem/reaction-event-certainty"/><identifier><system value="urn:ietf:rfc:3986"/><value value="urn:oid:2.16.840.1.113883.4.642.1.1276"/></identifier><version value="1.0.0"/><name value="AllergyIntoleranceCertainty"/><title value="AllergyIntoleranceCertainty"/><status value="draft"/><experimental value="false"/><date value="2020-04-09T21:10:28+00:00"/><publisher value="Health Level Seven International"/><contact><telecom><system value="url"/><value value="http://hl7.org"/></telecom><telecom><system value="email"/><value value="hq@HL7.org"/></telecom></contact><description value="Statement about the degree of clinical certainty that a specific substance was the cause of the manifestation in a reaction event."/><copyright value="This material derives from the HL7 Terminology (THO). THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license.html"/><caseSensitive value="true"/><valueSet value="http://terminology.hl7.org/ValueSet/reaction-event-certainty"/><content value="complete"/><concept><code value="unlikely"/><display value="Unlikely"/><definition value="There is a low level of clinical certainty that the reaction was caused by the identified substance."/><designation><use><system value="http://terminology.hl7.org/CodeSystem/designation-usage"/><code value="display"/></use><value value="Unlikely"/></designation></concept><concept><code value="likely"/><display value="Likely"/><definition value="There is a high level of clinical certainty that the reaction was caused by the identified substance."/><designation><use><system value="http://terminology.hl7.org/CodeSystem/designation-usage"/><code value="display"/></use><value value="Likely"/></designation></concept><concept><code value="confirmed"/><display value="Confirmed"/><definition value="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."/><designation><use><system value="http://terminology.hl7.org/CodeSystem/designation-usage"/><code value="display"/></use><value value="Confirmed"/></designation></concept><concept><code value="unknown"/><display value="Unknown"/><definition value="The clinical certainty that the reaction was caused by the identified substance is unknown.  It is an explicit assertion that certainty is not known."/><designation><use><system value="http://terminology.hl7.org/CodeSystem/designation-usage"/><code value="display"/></use><value value="Unknown"/></designation></concept></CodeSystem>