C18.9

C18.9: Malignant neoplasm of colon, unspecified

Billable / specific codeICD-10-CM

C18.9 is a billable, specific ICD-10-CM code for malignant neoplasm of colon, unspecified. It is valid for submission on a claim.

Check C18.9 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Malignant neoplasm of large intestine NOS

Excludes1 inherited from the categories above C18.9

A category’s note binds every code beneath it.

Written on C18: Malignant neoplasm of colon

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

Risk adjustment

C18.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 22 Bladder, Colorectal, and Other Cancers0.363 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score. Look up the whole chart to see which of its HCCs the hierarchy would zero.

Medicare coverage

C18.9 is named in 71 Medicare coverage policies: 71 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A52370Billing and Coding: Bevacizumab and biosimilars
A52479Oral Anticancer Drugs - Policy Article
A52986Billing and Coding: Biomarkers for Oncology
A53101Billing and Coding: MolDX: bioTheranostics Cancer TYPE ID® Update

Alphabetic index entries that lead here

Polyposis›coli›adenocarcinoma in
Polyposis›coli›carcinoma in
Adenocarcinoma›in›adenomatous›polyposis coli
Carcinoma›in›adenomatous›polyposis coli

Code history

Unchanged in every release from FY2024 to FY2027.