Malignant neoplasm of border of tongue

This code signifies a primary cancerous tumor originating from the junctional area between the mobile anterior two-thirds and the base of the tongue. This region, often referred to as the oral tongue or lingual border, is a common site for squamous cell carcinoma. The malignancy is characterized by uncontrolled cell growth and has the potential for local invasion and metastasis.

Apply this code when documentation clearly identifies a malignant neoplasm specifically located at the border of the tongue. This diagnosis is typically established through biopsy and histopathological confirmation. Use this code for the initial diagnosis, as well as for subsequent encounters related to the primary treatment of this specific malignancy.

• Ensure documentation specifies "border of tongue" to differentiate from other tongue subsites.
• Do not confuse with malignancies of the base of the tongue (C01) or other specified parts of the tongue (C02.2, C02.3, etc.).
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses or complications.