Melanoma in situ of unsp ear and external auricular canal

This code signifies the presence of melanoma that is confined to the epidermis (in situ) of an unspecified ear or external auditory canal. It indicates that the malignant cells have not invaded beyond the basement membrane.

Use this code when the pathology report confirms melanoma in situ and the specific ear (right or left) or a more precise location within the external auditory canal is not documented. Documentation must clearly state "in situ" and specify the ear or external auditory canal as the primary site.

• Ensure the pathology report explicitly states "in situ" to differentiate from invasive melanoma.
• Avoid using this code if the laterality (right or left ear) is specified; instead, use the more specific D03.21 or D03.22.
• Do not use this code for melanoma of the middle or inner ear, as those are coded elsewhere.