C18: Malignant neoplasm of colon

Codes under C18 (Malignant neoplasm of colon). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
C18.0	Malignant neoplasm of cecum	✓
C18.1	Malignant neoplasm of appendix	✓
C18.2	Malignant neoplasm of ascending colon	✓
C18.3	Malignant neoplasm of hepatic flexure	✓
C18.4	Malignant neoplasm of transverse colon	✓
C18.5	Malignant neoplasm of splenic flexure	✓
C18.6	Malignant neoplasm of descending colon	✓
C18.7	Malignant neoplasm of sigmoid colon	✓
C18.8	Malignant neoplasm of overlapping sites of colon	✓
C18.9	Malignant neoplasm of colon, unspecified	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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