Malignant melanoma of left lower eyelid, including canthus

This code identifies a cancerous growth originating from melanocytes, specifically located on the lower eyelid of the left eye, which may extend to or include the inner or outer corner (canthus) of the eye. It signifies a primary malignant tumor of the skin in this anatomical region.

Use this code when documentation confirms a diagnosis of malignant melanoma affecting the left lower eyelid, including cases where the canthus is involved. Supporting documentation should include pathology reports confirming melanoma and clear anatomical localization to the left lower eyelid.

• Ensure laterality is precisely documented as "left" and the specific eyelid (lower) is identified.
• Distinguish from benign nevi or other non-melanoma skin cancers of the eyelid.
• Do not use if the melanoma is secondary or metastatic to this site; instead, code the primary site and the secondary malignancy.