Patient identifier used by military hospitals to record relationship of the patient to the sponsor.

01-19	Child
20	Sponsor
30-39	Spouse
40-44	Mother
45-49	Father
50-54	Mother-in-law
55-59	Father-in-law
60-69	Other eligible dependents
98	Civilian emergency (Air Force/Navy)
99	Not classified elsewhere/stillborn
Blank	Not a military facility