This code system http://terminology.hl7.org/CodeSystem/ex-coverage-financial-exception defines the following codes:

Code Display Definition
retired Retired Retired persons have all copays and deductibles reduced.
foster Foster child Children in the foster care have all copays and deductibles waived.
<status value="draft"/> <publisher value="Financial Management"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="This codeset includes Example Coverage Financial Exceptions Code."/> <copyright value="HL7 Inc."/> <caseSensitive value="true"/> <content value="complete"/> <concept> <code value="retired"/> <display value="Retired"/> <definition value="Retired persons have all copays and deductibles reduced."/> </concept> <concept> <code value="foster"/> <display value="Foster child"/> <definition value="Children in the foster care have all copays and deductibles waived."/> </concept> </CodeSystem>