ICD-10-CM · Category

C09 — Malignant neoplasm of tonsil

Chapter C00-D49: Neoplasms

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Sub-codes under C09

C09.0Malignant neoplasm of tonsillar fossaC09.1Malig neoplasm of tonsillar pillar (anterior) (posterior)C09.8Malignant neoplasm of overlapping sites of tonsilC09.9Malignant neoplasm of tonsil, unspecified

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗