<status value="active"/> <date value="2014-03-26"/> <description value="Code specifying eligibility indicators used to assess or establish eligibility for coverage under a policy or program eligibility status, e.g., certificates of creditable coverage; student enrollment; adoption, marriage or birth certificate."/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-ObservationValue"/> <filter> <property value="concept"/> <op value="is-a"/> <value value="ELSTAT"/> </filter> </include> </compose> </ValueSet>