ICD-10-CM
ICD-10 code for Colon cancer: C18.9
The CDC title for "Colon cancer" is C18 (Malignant neoplasm of colon), a header that is not billable. When nothing more specific is documented, the billable code is C18.9, Malignant neoplasm of colon, unspecified.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under C18, then other CDC titles that name malignant neoplasm of colon
A header groups codes and is not billed. A billable code is one you can report.
- C18Malignant neoplasm of colonHeader
- C18.0Malignant neoplasm of cecumBillable
- C18.1Malignant neoplasm of appendixBillable
- C18.2Malignant neoplasm of ascending colonBillable
- C18.3Malignant neoplasm of hepatic flexureBillable
- C18.4Malignant neoplasm of transverse colonBillable
- C18.5Malignant neoplasm of splenic flexureBillable
- C18.6Malignant neoplasm of descending colonBillable
- C18.7Malignant neoplasm of sigmoid colonBillable
- C18.8Malignant neoplasm of overlapping sites of colonBillable
- C18.9Malignant neoplasm of colon, unspecifiedBillable
- Z12.11Encounter for screening for malignant neoplasm of colonBillable
Excludes1
Excludes1 means these codes are not reported together.
From C18. A note on a category applies to every code under it.
Related conditions
Related pages
- C18.9 code detailsNotes, nearby codes, CMS-HCC group
- Category C18Every code under it
- Chapter 2Neoplasms
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Colon cancer?
The CDC title for "Colon cancer" is C18 (Malignant neoplasm of colon), a header that is not billable. When nothing more specific is documented, the billable code is C18.9, Malignant neoplasm of colon, unspecified.
Is C18.9 billable?
Yes. C18.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to C18.9?
The CDC tabular list gives 1 Excludes1 note (not coded together) for C18.9 and the categories above it. They are listed on this page.
What chapter is C18.9 in?
Chapter 2. Neoplasms.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.