FamilyHistoryNotDoneReason

This code system http://hl7.org/fhir/history-not-done-reason defines the following codes:

Code	Display	Definition
subject-unknown	Subject Unknown	Patient does not know the subject, e.g. the biological parent of an adopted patient.
withheld	Information Withheld	The patient withheld or refused to share the information.
unable-to-obtain	Unable To Obtain	Information cannot be obtained; e.g. unconscious patient
deferred	Deferred	Patient does not have the information now, but can provide the information at a later date.