| 1 | Procedures and interventions, not elsewhere classified (Block: 00) |
| 2 | Operations on the nervous system (Block: 01-05) |
| 3 | Operations on the endocrine system (Block: 06-07) |
| 4 | Operations on the eye (Block: 08-16) |
| 5 | Other miscellaneous diagnostic and therapeutic procedures (Block: 17) |
| 6 | Operations on the ear (Block: 18-20) |
| 7 | Operations on the nose, mouth, and pharynx (Block: 21-29) |
| 8 | Operations on the respiratory system (Block: 30-34) |
| 9 | Operations on the cardiovascular system (Block: 35-39) |
| 10 | Operations on the hemic and lymphatic system (Block: 40-41) |
| 11 | Operations on the digestive system (Block: 42-54) |
| 12 | Operations on the urinary system (Block: 55-59) |
| 13 | Operations on the male genital organs (Block: 60-64) |
| 14 | Operations on the female genital organs (Block: 65-71) |
| 15 | Obstetrical procedures (Block: 72-75) |
| 16 | Operations on the musculoskeletal system (Block: 76-84) |
| 17 | Operations on the integumentary system (Block: 85-86) |
| 18 | Miscellaneous diagnostic and therapeutic procedures (Block: 87-89) |
