This code system http://terminology.hl7.org/CodeSystem/benefit-unit defines the following codes:

CodeDisplayDefinition
individual IndividualA single individual
family FamilyA family, typically includes self, spouse(s) and children to a defined age
<status value="draft"/><experimental value="false"/><description value="This value set includes a smattering of Unit type codes."/><copyright value="This is an example set."/><caseSensitive value="true"/><content value="complete"/><concept><code value="individual"/><display value="Individual"/><definition value="A single individual"/></concept><concept><code value="family"/><display value="Family"/><definition value="A family, typically includes self, spouse(s) and children to a defined age"/></concept></CodeSystem>