- CodeDescription
- C0 Central Nervous System
- C2 Heart
- C5 Veins
- C7 Lymphatic and Hematologic System
- C8 Eye
- C9 Ear, Nose, Mouth and Throat
- CB Respiratory System
- CD Gastrointestinal System
- CF Hepatobiliary System and Pancreas
- CG Endocrine System
- CH Skin, Subcutaneous Tissue and Breast
- CP Musculoskeletal System
- CT Urinary System
- CV Male Reproductive System
- CW Anatomical Regions