Malignant neoplasm of retromolar area

This code signifies a cancerous tumor originating in the retromolar trigone, the triangular area located behind the last molar tooth in the lower jaw. This is a specific type of oral cavity malignancy.

Use this code when documentation clearly identifies a primary malignant neoplasm located in the retromolar area. This diagnosis is typically confirmed by biopsy and pathology reports.

• Ensure the documentation specifies "retromolar area" and not a more general oral cavity site.
• Code any associated metastases separately using appropriate secondary malignancy codes.
• Always sequence the primary malignancy first, unless specific coding guidelines dictate otherwise for a particular encounter.