C18
C18: Malignant neoplasm of colon
Non-billable headerICD-10-CM
C18 is a non-billable header ICD-10-CM code for malignant neoplasm of colon. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- malignant carcinoid tumors of the colon (C7A.02-)
Other codes that can never be billed with C18
Their own Excludes1 notes name this code, so the conflict is not listed above.
- C17.2Malignant neoplasm of ileum
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead C18
10 child codes. Green means billable.
- C18.0Malignant neoplasm of cecum
- C18.1Malignant neoplasm of appendix
- C18.2Malignant neoplasm of ascending colon
- C18.3Malignant neoplasm of hepatic flexure
- C18.4Malignant neoplasm of transverse colon
- C18.5Malignant neoplasm of splenic flexure
- C18.6Malignant neoplasm of descending colon
- C18.7Malignant neoplasm of sigmoid colon
- C18.8Malignant neoplasm of overlapping sites of colon
- C18.9Malignant neoplasm of colon, unspecified