This value set includes codes based on the following rules:

This value set excludes codes based on the following rules:

<status value="active"/> <date value="2014-03-26"/> <description value="Interpretations of change of quantity and/or severity, such as "better", "worse", "increased", etc. At most one of B or W and one of U or D allowed."/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation"/> <filter> <property value="concept"/> <op value="is-a"/> <value value="_ObservationInterpretationChange"/> </filter> </include> <exclude> <system value="http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation"/> <concept> <code value="_ObservationInterpretationChange"/> </concept> </exclude> </compose> </ValueSet>