C18
Non-billableMalignant neoplasm of colon
C18 is the ICD-10-CM code for Malignant neoplasm of colon. It is a non-billable category code — use a more specific child code such as C18.0 for billing.
- Status
- Header (non-billable)
- Chapter
- C00-D49
- Subcodes
- 10
- Edition
- FY2026
C00-D49 Neoplasms
What this means — in plain language
MedlinePlus · NIHWhat is colorectal cancer? Colorectal cancer is cancer that develops in the tissues of the colon or rectum. Your colon and rectum are part of your digestive system: Your colon is the first and longest part of your large intestine. It absorbs water and some nutrients from foods. It also changes the leftover waste products into stool (poop). Your rectum is the lower part of your large intestine. It's where your body…
Read more about Colorectal Cancer at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Excludes1 — not coded here
- •malignant carcinoid tumors of the colon (C7A.02-)
Medications indicated for this condition
FDA labeling- BevacizumabVascular Endothelial Growth Factor Inhibitor [EPC]›
- Irinotecan›
- CapecitabineNucleoside Metabolic Inhibitor [EPC]›
- Levoleucovorin›
- OxaliplatinPlatinum-based Drug [EPC]›
- Irinotecan Hydrochloide›
- Adagrasib›
- CetuximabEpidermal Growth Factor Receptor Antagonist [EPC]›
- Encorafenib›
- Fruquintinib›
- IpilimumabCTLA-4-directed Blocking Antibody [EPC]›
- Nivolumab and Hyaluronidase-nvhyEndoglycosidase [EPC]›
Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Frequently asked questions
- What is ICD-10 code C18?
- C18 is the ICD-10-CM code for "Malignant neoplasm of colon". It falls under C00-D49 Neoplasms.
- Is C18 a billable code?
- No — C18 is a non-billable header code. Use a more specific child code (such as C18.0) for billing.
- What is excluded from C18?
- Excludes1 (not coded here): malignant carcinoid tumors of the colon (C7A.02-).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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