ICD-10-CM C18: Malignant neoplasm of colon

ICD-10-CM Diagnosis Code (2025)

Official Description for C18

Malignant neoplasm of colon

Coding Notes & Guidelines for C18

Excludes1: Not Coded Here

malignant carcinoid tumors of the colon (C7A.02-)

Excludes1: Not Coded Here

malignant neoplasm of rectosigmoid junction (C19)

Inclusion Terms

Malignant neoplasm of ileocecal valve

Inclusion Terms

Malignant neoplasm of sigmoid (flexure)

Inclusion Terms

Malignant neoplasm of large intestine NOS

Child Codes (More Specific Codes for C18):

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

About ICD-10-CM Code C18 (Malignant neoplasm of colon)

ICD-10-CM code C18 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM C18 became effective on October 1, 2024.

This page provides detailed information about C18 - Malignant neoplasm of colon. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Malignant neoplasm of colon.