Malignant neoplasm of tonsil

This code signifies the presence of a primary cancerous tumor originating in the palatine tonsil. It indicates a malignant growth within the lymphoid tissue located at the back of the throat. This diagnosis requires pathological confirmation of malignancy.

Assign this code when documentation clearly states a primary malignant neoplasm of the tonsil. This is appropriate for initial diagnosis, treatment, and follow-up care for this specific cancer. Supporting documentation includes pathology reports confirming malignancy and the tonsil as the primary site.

• Differentiate from secondary malignant neoplasms or benign tonsil conditions.
• Ensure the documentation specifies "tonsil" and not a more general pharyngeal site.
• Sequence according to official ICD-9-CM guidelines, typically as the primary diagnosis when it is the reason for the encounter.