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

CodeDisplayDefinition
subject-unknownSubject UnknownPatient does not know the subject, e.g. the biological parent of an adopted patient.
withheldInformation WithheldThe patient withheld or refused to share the information.
unable-to-obtainUnable To ObtainInformation cannot be obtained; e.g. unconscious patient
deferredDeferredPatient does not have the information now, but can provide the information at a later date.

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