Malignant neoplasm of lower lip, inner aspect

This diagnosis code identifies a cancerous growth originating on the mucosal surface of the lower lip, specifically on the side facing the oral cavity. This malignancy typically presents as a lesion, ulcer, or mass on the inner aspect of the vermilion border or the wet mucosa of the lower lip.

Apply this code when documentation clearly indicates a primary malignant neoplasm located on the internal surface of the lower lip. This is appropriate for confirmed diagnoses of squamous cell carcinoma, basal cell carcinoma, or other malignant tumors affecting this specific anatomical site.

• Differentiate from malignancies of the outer aspect (skin) of the lower lip, which have distinct codes.
• Ensure the documentation specifies "inner aspect" or "mucosal surface" of the lower lip to justify this precise code.
• Do not use for benign neoplasms or carcinoma in situ; specific codes exist for those conditions.