Malignant melanoma of skin of eyelid, including canthus

This code signifies a cancerous tumor originating from melanocytes, specifically located on the skin of the eyelid or the canthus (the corner of the eye). It represents a primary malignancy, indicating the initial site of the cancer rather than a metastatic spread. This is a serious form of skin cancer requiring prompt diagnosis and treatment.

Use this code when documentation clearly states a diagnosis of malignant melanoma affecting the skin of the eyelid or the canthus. This applies to both upper and lower eyelids, and either the medial or lateral canthus. Supporting documentation should include pathology reports confirming melanoma and specifying the eyelid or canthus as the primary site.

• Ensure the documentation specifies "skin of eyelid" or "canthus" to differentiate from melanoma of the conjunctiva or other ocular structures.
• Do not use for benign nevi or other non-melanoma skin cancers of the eyelid.
• Sequence as the primary diagnosis when the melanoma is the reason for the encounter, followed by any relevant secondary diagnoses or complications.