This value set contains 3 concepts

Code System Display Definition
   Y http://terminology.hl7.org/CodeSystem/v2-0532 Yes

Yes
   N http://terminology.hl7.org/CodeSystem/v2-0532 No

No
   asked-unknown http://terminology.hl7.org/CodeSystem/data-absent-reason Don't know

The source was asked but does not know the value.
<status value="draft"/> <experimental value="true"/> <description value="For Capturing simple yes-no-don't know answers"/> <compose> <include> <valueSet value="http://terminology.hl7.org/ValueSet/v2-0136"/> </include> <include> <system value="http://terminology.hl7.org/CodeSystem/data-absent-reason"/> <concept> <code value="asked-unknown"/> <display value="Don't know"/> </concept> </include> </compose> <expansion> <identifier value="urn:uuid:bf99fe50-2c2b-41ad-bd63-bee6919810b4"/> <timestamp value="2015-07-14T10:00:00Z"/> <contains> <system value="http://terminology.hl7.org/CodeSystem/v2-0532"/> <code value="Y"/> <display value="Yes"/> </contains> <contains> <system value="http://terminology.hl7.org/CodeSystem/v2-0532"/> <code value="N"/> <display value="No"/> </contains> <contains> <system value="http://terminology.hl7.org/CodeSystem/data-absent-reason"/> <code value="asked-unknown"/> <display value="Don't know"/> </contains> </expansion> </ValueSet>