This code system http://hl7.org/fhir/flag-priority-code defines the following codes:

CodeDisplayDefinition
PN No alarmNo alarm.
PL Low priorityLow priority.
PM Medium priorityMedium priority.
PH High priorityHigh priority.
<status value="active"/><experimental value="false"/><description value="This value set is provided as an exemplar. The value set is driven by IHE Table B.8-4: Abnormal Flags, Alert Priority."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><content value="complete"/><concept><code value="PN"/><display value="No alarm"/><definition value="No alarm."/></concept><concept><code value="PL"/><display value="Low priority"/><definition value="Low priority."/></concept><concept><code value="PM"/><display value="Medium priority"/><definition value="Medium priority."/></concept><concept><code value="PH"/><display value="High priority"/><definition value="High priority."/></concept></CodeSystem>