C18 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Malignant neoplasm of colon.
Type 1 excludes
Malignant carcinoid tumors of the colon (C7A.02-)
Codes
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
Versions
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code