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ICD-10-CM category

C21: Malignant neoplasm of anus and anal canal

4 subcodes · 4 billable · Look up any code with the ICD-10 search

Codes under C21 (Malignant neoplasm of anus and anal canal). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

CodeDescriptionBillable
C21.0Malignant neoplasm of anus, unspecified✓
C21.1Malignant neoplasm of anal canal✓
C21.2Malignant neoplasm of cloacogenic zone✓
C21.8Malignant neoplasm of overlapping sites of rectum, anus and anal canal✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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