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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="evidence-variable-event"/>
  <meta>
    <lastUpdated value="2026-04-01T17:59:15.240+00:00"/>
  </meta>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p class="res-header-id">
        <b>Generated Narrative: CodeSystem evidence-variable-event</b>
      </p>
      <a name="evidence-variable-event"> </a>
      <a name="hcevidence-variable-event"> </a>
      <p>This case-sensitive code system 
        <code>http://hl7.org/fhir/evidence-variable-event</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">study-start
            <a name="evidence-variable-event-study-start"> </a>
          </td>
          <td>Study Start</td>
          <td>The time of enrollment for the study participant</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">treatment-start
            <a name="evidence-variable-event-treatment-start"> </a>
          </td>
          <td>Start of Treatment</td>
          <td>The time of initiation of the treatment</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">condition-detection
            <a name="evidence-variable-event-condition-detection"> </a>
          </td>
          <td>Detection of Condition</td>
          <td>The time of first detection of the condition</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">condition-treatment
            <a name="evidence-variable-event-condition-treatment"> </a>
          </td>
          <td>Treatment of Condition</td>
          <td>The time of first treatment of the condition</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">hospital-admission
            <a name="evidence-variable-event-hospital-admission"> </a>
          </td>
          <td>Hospital Admission</td>
          <td>The time of admission to the hospital</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">hospital-discharge
            <a name="evidence-variable-event-hospital-discharge"> </a>
          </td>
          <td>Hospital Discharge</td>
          <td>The time of discharge from the hospital</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">operative-procedure
            <a name="evidence-variable-event-operative-procedure"> </a>
          </td>
          <td>Operative Procedure</td>
          <td>The time of surgery</td>
        </tr>
      </table>
    </div>
  </text>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="cds"/>
  </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="5"/>
  </extension>
  <url value="http://hl7.org/fhir/evidence-variable-event"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.1955"/>
  </identifier>
  <version value="6.0.0-ballot4"/>
  <name value="EvidenceVariableEvent"/>
  <title value="Evidence Variable Event"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2021-01-05T10:01:24+11:00"/>
  <publisher value="HL7 International / Clinical Decision Support"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="fhir@lists.hl7.org"/>
    </telecom>
  </contact>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://www.hl7.org/Special/committees/dss"/>
    </telecom>
  </contact>
  <description value="The event used as a base point (reference point) in time."/>
  <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/evidence-variable-event"/>
  <content value="complete"/>
  <concept>
    <code value="study-start"/>
    <display value="Study Start"/>
    <definition value="The time of enrollment for the study participant"/>
  </concept>
  <concept>
    <code value="treatment-start"/>
    <display value="Start of Treatment"/>
    <definition value="The time of initiation of the treatment"/>
  </concept>
  <concept>
    <code value="condition-detection"/>
    <display value="Detection of Condition"/>
    <definition value="The time of first detection of the condition"/>
  </concept>
  <concept>
    <code value="condition-treatment"/>
    <display value="Treatment of Condition"/>
    <definition value="The time of first treatment of the condition"/>
  </concept>
  <concept>
    <code value="hospital-admission"/>
    <display value="Hospital Admission"/>
    <definition value="The time of admission to the hospital"/>
  </concept>
  <concept>
    <code value="hospital-discharge"/>
    <display value="Hospital Discharge"/>
    <definition value="The time of discharge from the hospital"/>
  </concept>
  <concept>
    <code value="operative-procedure"/>
    <display value="Operative Procedure"/>
    <definition value="The time of surgery"/>
  </concept>
</CodeSystem>