Malignant melanoma of left upper eyelid, including canthus

This code signifies a cancerous growth originating from melanocytes, specifically located on the left upper eyelid, including the canthal region. This is a highly aggressive form of skin cancer with a propensity for metastasis if not treated promptly.

Apply this code when documentation confirms a primary malignant melanoma diagnosed on the patient's left upper eyelid, encompassing any involvement of the inner or outer canthus. Supporting documentation should include pathology reports confirming melanoma and clear anatomical localization.

• Differentiate from benign nevi or other non-melanoma skin cancers of the eyelid.
• Ensure laterality (left) and specific eyelid involvement (upper) are clearly documented.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses.