ICD-10-CM · Chapter 2 · C00-D49
C18 Malignant neoplasm of colon
Excludes 1 (cannot be coded together)
- malignant carcinoid tumors of the colon (C7A.02-)
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| C18..0 | Malignant neoplasm of cecum | Yes |
| C18..1 | Malignant neoplasm of appendix | Yes |
| C18..2 | Malignant neoplasm of ascending colon | Yes |
| C18..3 | Malignant neoplasm of hepatic flexure | Yes |
| C18..4 | Malignant neoplasm of transverse colon | Yes |
| C18..5 | Malignant neoplasm of splenic flexure | Yes |
| C18..6 | Malignant neoplasm of descending colon | Yes |
| C18..7 | Malignant neoplasm of sigmoid colon | Yes |
| C18..8 | Malignant neoplasm of overlapping sites of colon | Yes |
| C18..9 | Malignant neoplasm of colon, unspecified | Yes |
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category C18:
- Colon Cancer — Cáncer de colon
Last reviewed: September 2026