All ICD10 Codes

C09

Non-Billable
ChapterC00–D49
Rankcategory
Description

Malignant neoplasm of tonsil

About ICD-10-CM code C09

C09 is the ICD-10-CM diagnosis code for Malignant neoplasm of tonsil. It sits in C00-D49 Neoplasms, within Malignant neoplasms of lip, oral cavity and pharynx (C00-C14). C09 is not billable on its own, coders must choose one of its more specific child codes instead.

Use a more specific code (4 billable)
C09.0Malignant neoplasm of tonsillar fossaC09.1Malignant neoplasm of tonsillar pillar (anterior) (posterior)C09.8Malignant neoplasm of overlapping sites of tonsilC09.9Malignant neoplasm of tonsil, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 2: Neoplasms (C00-D49).

Instructional Notes

Excludes2(Not included here. Code separately if applicable.)
  • malignant neoplasm of lingual tonsil (C02.4)
  • malignant neoplasm of pharyngeal tonsil (C11.1)
Use Additional Code
  • code to identify:
  • alcohol abuse and dependence (F10.-)
  • exposure to environmental tobacco smoke (Z77.22)
  • exposure to tobacco smoke in the perinatal period (P96.81)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Clinical Hierarchy

BillableHas subcodes
CH2Neoplasms (C00-D49)
C00-C14Malignant neoplasms of lip, oral cavity and pharynx (C00-C14)
C09Malignant neoplasm of tonsilNot billable
C09.0Malignant neoplasm of tonsillar fossaBillable
C09.1Malignant neoplasm of tonsillar pillar (anterior) (posterior)Billable
C09.8Malignant neoplasm of overlapping sites of tonsilBillable
C09.9Malignant neoplasm of tonsil, unspecifiedBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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