<?xml version="1.0" encoding="UTF-8"?><CodeSystem xmlns="http://hl7.org/fhir"><id value="medication-statement-adherence"/><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 medication-statement-adherence</b></p><a name="medication-statement-adherence"> </a><a name="hcmedication-statement-adherence"> </a><p>This case-sensitive code system <code>http://hl7.org/fhir/CodeSystem/medication-statement-adherence</code> defines the following codes in a Is-A hierarchy:</p><table class="codes"><tr><td><b>Lvl</b></td><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td>1</td><td style="white-space:nowrap">taking<a name="medication-statement-adherence-taking"> </a></td><td>Taking</td><td>The medication is being taken.</td></tr><tr><td>2</td><td style="white-space:nowrap">  taking-as-directed<a name="medication-statement-adherence-taking-as-directed"> </a></td><td>Taking As Directed</td><td>The medication is being taken as directed.</td></tr><tr><td>2</td><td style="white-space:nowrap">  taking-not-as-directed<a name="medication-statement-adherence-taking-not-as-directed"> </a></td><td>Taking Not As Directed</td><td>The medication is not being taken as directed.</td></tr><tr><td>1</td><td style="white-space:nowrap">not-taking<a name="medication-statement-adherence-not-taking"> </a></td><td>Not Taking</td><td>The medication is not being taken.</td></tr><tr><td>2</td><td style="white-space:nowrap">  on-hold<a name="medication-statement-adherence-on-hold"> </a></td><td>On Hold</td><td>The medication is on hold.</td></tr><tr><td>3</td><td style="white-space:nowrap">    on-hold-as-directed<a name="medication-statement-adherence-on-hold-as-directed"> </a></td><td>On Hold As Directed</td><td>The medication is on hold as directed.</td></tr><tr><td>3</td><td style="white-space:nowrap">    on-hold-not-as-directed<a name="medication-statement-adherence-on-hold-not-as-directed"> </a></td><td>On Hold Not As Directed</td><td>The medication is on hold not as directed.</td></tr><tr><td>2</td><td style="white-space:nowrap">  stopped<a name="medication-statement-adherence-stopped"> </a></td><td>Stopped</td><td>The medication is stopped.</td></tr><tr><td>3</td><td style="white-space:nowrap">    stopped-as-directed<a name="medication-statement-adherence-stopped-as-directed"> </a></td><td>Stopped As Directed</td><td>The medication is stopped as directed.</td></tr><tr><td>3</td><td style="white-space:nowrap">    stopped-not-as-directed<a name="medication-statement-adherence-stopped-not-as-directed"> </a></td><td>Stopped Not As Directed</td><td>The medication is stopped not as directed.</td></tr><tr><td>1</td><td style="white-space:nowrap">unknown<a name="medication-statement-adherence-unknown"> </a></td><td>Unknown</td><td>Whether the medication is being taken or not is not currently known.</td></tr></table></div></text><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="phx"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"><valueCode value="informative"/></extension><url value="http://hl7.org/fhir/CodeSystem/medication-statement-adherence"/><identifier><system value="urn:ietf:rfc:3986"/><value value="urn:oid:2.16.840.1.113883.4.642.4.1981"/></identifier><version value="6.0.0-ballot4"/><name value="MedicationStatementAdherenceCodes"/><title value="MedicationStatement Adherence Codes"/><status value="active"/><experimental value="false"/><publisher value="HL7 International"/><description value="MedicationStatement Adherence Codes"/><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/medication-statement-adherence"/><hierarchyMeaning value="is-a"/><content value="complete"/><concept><code value="taking"/><display value="Taking"/><definition value="The medication is being taken."/><concept><code value="taking-as-directed"/><display value="Taking As Directed"/><definition value="The medication is being taken as directed."/></concept><concept><code value="taking-not-as-directed"/><display value="Taking Not As Directed"/><definition value="The medication is not being taken as directed."/></concept></concept><concept><code value="not-taking"/><display value="Not Taking"/><definition value="The medication is not being taken."/><concept><code value="on-hold"/><display value="On Hold"/><definition value="The medication is on hold."/><concept><code value="on-hold-as-directed"/><display value="On Hold As Directed"/><definition value="The medication is on hold as directed."/></concept><concept><code value="on-hold-not-as-directed"/><display value="On Hold Not As Directed"/><definition value="The medication is on hold not as directed."/></concept></concept><concept><code value="stopped"/><display value="Stopped"/><definition value="The medication is stopped."/><concept><code value="stopped-as-directed"/><display value="Stopped As Directed"/><definition value="The medication is stopped as directed."/></concept><concept><code value="stopped-not-as-directed"/><display value="Stopped Not As Directed"/><definition value="The medication is stopped not as directed."/></concept></concept></concept><concept><code value="unknown"/><display value="Unknown"/><definition value="Whether the medication is being taken or not is not currently known."/></concept></CodeSystem>