For each approved SSDI application, this variable contains the diagnostic group for the individual's primary code for mental or physical disability used in the medical determination of the individual's eligibility for disability benefits. See mbr_ssdi_applied_k for details on how individual applications are recorded on this file. 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.