<?xml version="1.0" encoding="UTF-8"?><ActivityDefinition xmlns="http://hl7.org/fhir">
  <id value="heart-valve-replacement"/>
  <meta>
    <security>
      <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/>
      <code value="HTEST"/>
      <display value="test health data"/>
    </security>
  </meta>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="cds"/>
  </extension>
  <status value="draft"/>
  <publisher value="HL7 International / Clinical Decision Support"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://www.hl7.org/Special/committees/dss"/>
    </telecom>
  </contact>
  <description value="Heart valve replacement"/>
  <useContext>
    <code>
      <system value="http://terminology.hl7.org/CodeSystem/usage-context-type"/>
      <code value="age"/>
    </code>
    <valueCodeableConcept>
      <coding>
        <system value="https://meshb.nlm.nih.gov"/>
        <code value="D000328"/>
        <display value="Adult"/>
      </coding>
    </valueCodeableConcept>
  </useContext>
  <useContext>
    <code>
      <system value="http://terminology.hl7.org/CodeSystem/usage-context-type"/>
      <code value="user"/>
    </code>
    <valueCodeableConcept>
      <coding>
        <system value="http://snomed.info/sct"/>
        <code value="309343006"/>
        <display value="Physician"/>
      </coding>
    </valueCodeableConcept>
  </useContext>
  <purpose value="Describes the proposal to perform a Heart Valve replacement."/>
  <usage value="This activity definition is used as the definition of a service request to perform a heart valve replacement. Elements that apply universally are defined here, while elements that apply to the specific setting of a referral within a particular order set are defined in the order set."/>
  <topic>
    <coding>
      <system value="http://snomed.info/sct"/>
      <code value="34068001"/>
      <display value="Heart valve replacement"/>
    </coding>
  </topic>
  <kind value="ServiceRequest"/>
  <code>
    <coding>
      <system value="http://snomed.info/sct"/>
      <code value="34068001"/>
      <display value="Heart valve replacement"/>
    </coding>
  </code>
  <timingTiming>
    <event>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-expression">
        <valueExpression>
          <language value="text/cql-expression"/>
          <expression value="Now()"/>
        </valueExpression>
      </extension>
    </event>
  </timingTiming>
  <location>
    <reference>
      <reference value="Location/1"/>
    </reference>
  </location>
  <participant>
    <type value="practitioner"/>
    <role>
      <coding>
        <system value="http://nucc.org/provider-taxonomy"/>
        <code value="207RI0011X"/>
        <display value="Interventional Cardiology Physician"/>
      </coding>
      <text value="Interventional Cardiology"/>
    </role>
  </participant>
  <bodySite>
    <coding>
      <system value="http://snomed.info/sct"/>
      <code value="17401000"/>
      <display value="Heart valve structure"/>
    </coding>
  </bodySite>
</ActivityDefinition>