Melanoma in situ of right upper eyelid, including canthus

This code signifies the presence of melanoma that is confined to the epidermis (in situ) on the right upper eyelid, encompassing the canthal region. It indicates a non-invasive malignant lesion that has not penetrated the basement membrane.

Use this code when documentation confirms a diagnosis of melanoma in situ specifically located on the right upper eyelid, including any involvement of the canthus. This diagnosis is typically established via biopsy and histopathological examination.

• Ensure the documentation explicitly states "in situ" and specifies the right upper eyelid and/or canthus.
• Distinguish from invasive melanoma of the eyelid, which would be coded to a different category (C43.-).
• Laterality (right) and specific anatomical site (upper eyelid, including canthus) are crucial for accurate code selection.