Malignant neoplasm of upper lip, inner aspect

This code signifies a primary cancerous tumor originating from the mucosal lining of the upper lip, specifically on its inner surface. This malignancy is characterized by uncontrolled cell growth and has the potential to invade surrounding tissues and metastasize.

Apply this code when documentation clearly indicates a confirmed diagnosis of a primary malignant neoplasm located on the inner aspect of the upper lip. This typically follows biopsy confirmation and pathological review.

• Ensure documentation specifies "inner aspect" to differentiate from external lip involvement.
• Verify laterality if specified, though not explicitly required for this code.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter.