Malig neoplasm of tonsillar pillar (anterior) (posterior)

This diagnosis code identifies a primary cancerous tumor originating in the tonsillar pillars, which are the folds of tissue surrounding the palatine tonsils. This malignancy can affect either the anterior (glossopalatine arch) or posterior (pharyngopalatine arch) pillar.

Apply this code when documentation confirms a primary malignant neoplasm specifically located in the tonsillar pillar, as identified through biopsy or imaging. This is typically used for patients undergoing treatment such as surgery, radiation, or chemotherapy for this specific cancer.

• Differentiate from malignant neoplasms of the palatine tonsil itself (C09.0) or other parts of the oropharynx.
• Ensure the documentation specifies "tonsillar pillar" and not just a general tonsil area.
• Sequence as the primary diagnosis when it is the reason for the encounter or treatment.