This value set includes codes based on the following rules:

This value set excludes codes based on the following rules:

 <status value="active"/> <experimental value="false"/> <date value="2014-03-26"/> <description value="Any elastic aeriform fluid in which the molecules are separated from one another and have free paths."/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-orderableDrugForm"/> <filter> <property value="concept"/> <op value="is-a"/> <value value="_GasDrugForm"/> </filter> </include> <exclude> <system value="http://terminology.hl7.org/CodeSystem/v3-orderableDrugForm"/> <concept> <code value="_GasDrugForm"/> </concept> </exclude> </compose> </ValueSet>