C09: Malignant neoplasm of tonsil
Codes under C09 (Malignant neoplasm of tonsil). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| C09.0 | Malignant neoplasm of tonsillar fossa | ✓ |
| C09.0 | Malignant neoplasm of tonsillar fossa | ✓ |
| C09.1 | Malignant neoplasm of tonsillar pillar (anterior) (posterior) | ✓ |
| C09.1 | Malignant neoplasm of tonsillar pillar (anterior) (posterior) | ✓ |
| C09.8 | Malignant neoplasm of overlapping sites of tonsil | ✓ |
| C09.8 | Malignant neoplasm of overlapping sites of tonsil | ✓ |
| C09.9 | Malignant neoplasm of tonsil, unspecified | ✓ |
| C09.9 | Malignant neoplasm of tonsil, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code C09?
C09 is an ICD-10-CM category covering Malignant neoplasm of tonsil. It contains 8 more specific diagnosis codes, 8 of which are billable.
Is C09 a billable code?
No — C09 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example C09.0 — Malignant neoplasm of tonsillar fossa). 8 of the 8 codes under C09 are billable.
What codes fall under C09?
C09 includes C09.0, C09.0, C09.1, C09.1, C09.8, plus 3 more. See the full list with descriptions and billable status above.
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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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