Malignant neoplasm of upper lip, inner aspect

This code identifies a primary cancerous tumor originating from the internal surface of the upper lip. This includes malignancies affecting the mucosal lining and submucosal tissues of the upper lip's inner aspect. It specifically denotes the presence of a malignant neoplasm in this anatomical location.

Assign this code when documentation clearly indicates a primary malignant neoplasm located on the inner aspect of the upper lip. This is supported by pathology reports confirming malignancy and physician notes specifying the tumor's exact location within the upper lip. Use this code for initial encounters and subsequent treatment for this specific cancer.

• Differentiate from malignant neoplasms of the outer lip, which are classified elsewhere.
• Ensure documentation specifies "inner aspect" or "mucosal surface" of the upper lip to support this code.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses.