C21
Non-billableMalignant neoplasm of anus and anal canal
C21 is the ICD-10-CM code for Malignant neoplasm of anus and anal canal. It is a non-billable category code — use a more specific child code such as C21.0 for billing.
- Status
- Header (non-billable)
- Chapter
- C00-D49
- Subcodes
- 4
- Edition
- FY2026
C00-D49 Neoplasms
Excludes2 — not included here
- •malignant carcinoid tumors of the colon (C7A.02-)
- •malignant melanoma of anal margin (C43.51)
- •malignant melanoma of anal skin (C43.51)
- •malignant melanoma of perianal skin (C43.51)
- •other and unspecified malignant neoplasm of anal margin (C44.500, C44.510, C44.520, C44.590)
- •other and unspecified malignant neoplasm of anal skin (C44.500, C44.510, C44.520, C44.590)
- •other and unspecified malignant neoplasm of perianal skin (C44.500, C44.510, C44.520, C44.590)
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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