Note: 1 Operations on the nervous system; 2 Operations on the endocrine system; 3 Operations on the eye; 4 Operations on the ear; 5 Operations on the nose, mouth, and pharynx; 6 Operations on the respiratory system; 7 Operations on the cardiovascular system; 8 Operations on the hemic and lymphatic system; 9 Operations on the digestive system; 10 Operations on the urinary system; 11 Operations on the male genital organs; 12 Operations on the female genital organs; 13 Obstetrical procedures; 14 Operations on the musculoskeletal system; 15 Operations on the integumentary system; 16 Miscellaneous diagnostic and therapeutic procedures.