This variable contains the diagnostic group for the SSI recipient's primary code for mental or physical disability used in the medical determination of the individual's eligibility for disability benefits. Codes: 01?Diseases of the blood; 02?Circulatory system; 03?Congenital anomalies; 04?Digestive system; 05?Endocrine, nutritional, and metabolic diseases; 06?Genitourinary system; 07?Infectious and parasitic diseases; 08?Injuries; 09?Mental disorders; 10?Mental retardation; 11?Musculoskeletal system; 12?Neoplasms; 13?Nervous system and sense organs; 14?Respiratory system; 15?Skin and subcutaneous tissue; 16?Other or unknown.