

- Colon
- (excluding Appendix, Gastrointestnal Stromal Tumor, and Neuroendocrine Tumor)
C18.0, C18.2--C18.9
- C18.0 Cecum
- C18.2 Ascending colon
- C18.3 Hepatic flexure of colon
- C18.4 Transverse colon
- C18.5 Splenic flexure of colon
- C18.6 Descending colon
- C18.7 Sigmoid colon
- C18.8 Overlapping lesion of colon
- C18.9 Colon, NOS


- Rectosigmoid, Rectum
- (excluding Gastrointestinal Stromal Tumor and Neuroendocrine Tumor)
C19.9, C20.9
- M-8000-8152,8154-8231,8243-8245,8247-8248,8250-8576,8940-8950,8980-8981
- C19.9 Rectosigmoid junction
- C20.9 Rectum, NOS

