This code system http://hl7.org/fhir/relationship defines the following codes:

Code Display Definition
1 Self The patient is the subscriber (policy holder)
2 Spouse The patient is the spouse or equivalent of the subscriber (policy holder)
3 Child The patient is the child of the subscriber (policy holder)
4 Common Law Spouse The patient is the common law spouse of the subscriber (policy holder)
5 Other The patient has some other relationship, such as parent, to the subscriber (policy holder)
<status value="draft"/> <experimental value="true"/> <publisher value="FHIR Project team"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="This value set includes the Patient to subscriber relationship codes."/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <copyright value="This is an example set."/> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/relationship"/> <content value="complete"/> <concept> <code value="1"/> <display value="Self"/> <definition value="The patient is the subscriber (policy holder)"/> </concept> <concept> <code value="2"/> <display value="Spouse"/> <definition value="The patient is the spouse or equivalent of the subscriber (policy holder)"/> </concept> <concept> <code value="3"/> <display value="Child"/> <definition value="The patient is the child of the subscriber (policy holder)"/> </concept> <concept> <code value="4"/> <display value="Common Law Spouse"/> <definition value="The patient is the common law spouse of the subscriber (policy holder)"/> </concept> <concept> <code value="5"/> <display value="Other"/> <definition value="The patient has some other relationship, such as parent, to the subscriber (policy holder)"/> </concept> </CodeSystem>