Melanoma in situ of left ear and external auricular canal

This code signifies the presence of melanoma that is confined to the epidermis (in situ) on the left ear or within the external auditory canal. It represents the earliest stage of melanoma, where malignant cells have not yet invaded deeper tissues.

Assign this code when documentation confirms a diagnosis of melanoma in situ specifically located on the left ear or its external canal. This diagnosis is typically established through a biopsy confirming epidermal involvement without dermal invasion.

• Ensure the documentation explicitly specifies "in situ" and the exact anatomical location (left ear/external auricular canal).
• Do not use this code if the melanoma has invaded beyond the epidermis; instead, refer to codes for invasive melanoma.
• Laterality is crucial; confirm the left side is documented.