# description
Codes describing the reason why a family member's history is not available.

# concept[].definition
Patient does not know the subject, e.g. the biological parent of an adopted patient.

# concept[].definition
The patient withheld or refused to share the information.

# concept[].definition
Information cannot be obtained; e.g. unconscious patient.

# concept[].definition
Patient does not have the information now, but can provide the information at a later date.