Melanocytic nevi of left ear and external auricular canal

This code identifies the presence of a melanocytic nevus, commonly known as a mole, located specifically on the left ear or within the external auditory canal. These are benign proliferations of melanocytes, the pigment-producing cells of the skin.

Apply this code when documentation clearly indicates a diagnosis of a melanocytic nevus on the left ear, including the auricle, lobule, or external auditory canal. Supporting documentation should specify the laterality and anatomical site of the nevus.

• Ensure laterality (left ear) is explicitly documented; do not assume.
• Distinguish from malignant melanoma (C43.2) or other benign neoplasms of the ear.
• If the nevus is excised, this code would be used as the primary diagnosis for the pathology report.