Melanoma in situ of right lower eyelid, including canthus

This code describes a non-invasive malignant melanoma confined to the epidermis (in situ) located on the right lower eyelid, which includes the inner or outer corner (canthus) of the eye. It signifies that the melanoma has not spread beyond its original site and has not invaded deeper tissues.

Use this code when documentation specifies a diagnosis of melanoma in situ affecting the right lower eyelid, including any involvement of the canthus. This diagnosis is typically confirmed by biopsy and pathology reports indicating melanoma confined to the epidermis.

• Ensure the pathology report explicitly states "in situ" and specifies the right lower eyelid, including or explicitly mentioning the canthus.
• Distinguish from invasive melanoma of the eyelid, which would be coded differently based on the depth of invasion.
• Laterality (right) and specific eyelid involvement (lower) are crucial for accurate code selection.