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

Code Display Definition
individual Individual A single individual
family Family A 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>