00 0. PROCEDURES AND INTERVENTIONS , NOT ELSEWHERE CLASSIFIED

01-05 1. OPERATIONS ON THE NERVOUS SYSTEM

06-07 2. OPERATIONS ON THE ENDOCRINE SYSTEM

08-16 3. OPERATIONS ON THE EYE

17 3A. OTHER MISCELLANEOUS DIAGNOSTIC AND THERAPEUTIC PROCEDURES

18-20 4. OPERATIONS ON THE EAR

21-29 5. OPERATIONS ON THE NOSE, MOUTH, AND PHARYNX

30-34 6. OPERATIONS ON THE RESPIRATORY SYSTEM

35-39 7. OPERATIONS ON THE CARDIOVASCULAR SYSTEM

40-41 8. OPERATIONS ON THE HEMIC AND LYMPHATIC SYSTEM

42-54 9. OPERATIONS ON THE DIGESTIVE SYSTEM

55-59 10. OPERATIONS ON THE URINARY SYSTEM

60-64 11. OPERATIONS ON THE MALE GENITAL ORGANS

65-71 12. OPERATIONS ON THE FEMALE GENITAL ORGANS

72-75 13. OBSTETRICAL PROCEDURES

76-84 14. OPERATIONS ON THE MUSCULOSKELETAL SYSTEM

85-86 15. OPERATIONS ON THE INTEGUMENTARY SYSTEM

87-99 16. MISCELLANEOUS DIAGNOSTIC AND THERAPEUTIC PROCEDURES