ICD-O-3 Site Codes
Related Adjectives
- Colon—colo, colono-
- Rectum—rectal, recto-
- Anus—procto-, ano-
- Colon and rectum—large bowel, large intestine, colorectal
| ICD-O-2/3 |
Term |
| C18.0 |
Cecum |
| C18.1 |
Appendix |
| C18.2 |
Ascending colon; Right colon |
| C18.3 |
Hepatic flexure of colon |
| C18.4 |
Transverse colon |
| C18.5 |
Splenic flexure of colon |
| C18.6 |
Descending colon; Left colon |
| C18.7 |
Sigmoid colon |
| C18.8 |
Overlapping lesion of colon |
| C18.9 |
Colon, NOS |
| ICD-O-2/3 |
Term |
Rectosigmoid junction
| C19.9 |
Rectosigmoid junction |
| ICD-O-2/3 |
Term |
Rectum
| C20.9 |
Rectum, NOS |
| ICD-O-2/3 |
Term |
Anus and Anal canal
| C21.0 |
Anus, NOS (excludes
Skin of anus and Perianal skin C44.5) |
| C21.1 |
Anal canal |
| C21.2 |
Cloacogenic zone |
| C21.8 |
Overlapping lesion of rectum, anus and anal canal |
Each ICD-O four-digit sub site within the colon and rectum is considered a separate primary site.
