Malignant melanoma of unspecified eyelid, including canthus

This code signifies a cancerous tumor originating from melanocytes, specifically located on an eyelid where the exact laterality (right or left) is not documented. This malignant neoplasm can affect any part of the eyelid, including the inner or outer corner (canthus).

Apply this code when documentation confirms a diagnosis of malignant melanoma of the eyelid, but the medical record does not specify whether it is the right or left eyelid. This is appropriate for pathology reports or physician notes indicating "eyelid melanoma" without further laterality.

• Always seek clarification from the provider if laterality (right or left) is missing to use a more specific code.
• Distinguish from benign melanocytic nevi of the eyelid (D22.1-) or other malignant eyelid neoplasms (C44.1-).
• Sequence this code as the primary diagnosis when it is the reason for the encounter, such as for excision or biopsy.