C18
⚠ Non-billable
Malignant neoplasm of colon
ICD-10-CM · FY2026 · Neoplasms
Code
C18
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Neoplasms
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code C18?
ICD-10-CM code C18 represents Malignant neoplasm of colon. It is a non-billable header code requiring a more specific subcategory in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.
Is C18 billable?
No. C18 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is C18 in?
C18 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.
Related codes in the C18 category
C18.0
Malignant neoplasm of cecum
Billable
C18.1
Malignant neoplasm of appendix
Billable
C18.2
Malignant neoplasm of ascending colon
Billable
C18.3
Malignant neoplasm of hepatic flexure
Billable
C18.4
Malignant neoplasm of transverse colon
Billable
C18.5
Malignant neoplasm of splenic flexure
Billable
C18.6
Malignant neoplasm of descending colon
Billable
C18.7
Malignant neoplasm of sigmoid colon
Billable
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