Malignant melanoma of right lower eyelid, including canthus

This code signifies a primary cancerous growth of melanocytes, specifically located on the right lower eyelid, encompassing the inner or outer corner of the eye where the lids meet. This is a serious form of skin cancer requiring precise anatomical identification.

Apply this code when documentation confirms a malignant melanoma originating in the right lower eyelid, including any involvement of the canthus. This diagnosis is typically established via biopsy and histopathological examination, with the pathology report specifying the primary site and laterality.

• Ensure documentation clearly specifies "malignant melanoma" and not a benign nevus or other eyelid malignancy.
• Verify the laterality (right) and the specific eyelid (lower) are explicitly stated in the medical record.
• Distinguish from secondary or metastatic melanoma to the eyelid, which would be coded differently.