C18 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Malignant neoplasm of colon.
Malignant carcinoid tumors of the colon (C7A.02-)
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Malignant neoplasm of cecum
Malignant neoplasm of appendix
Malignant neoplasm of ascending colon
Malignant neoplasm of hepatic flexure
Malignant neoplasm of transverse colon
Malignant neoplasm of splenic flexure
Malignant neoplasm of descending colon
Malignant neoplasm of sigmoid colon
Malignant neoplasm of overlapping sites of colon
Malignant neoplasm of colon, unspecified
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