Merkel cell carcinoma of right upper eyelid, inc canthus

This code signifies a rare and aggressive neuroendocrine carcinoma, specifically Merkel cell carcinoma, originating in the right upper eyelid, including the canthal region. This malignancy is characterized by rapid growth and a high propensity for metastasis.

Apply this code when documentation explicitly states a confirmed diagnosis of Merkel cell carcinoma affecting the right upper eyelid, encompassing the inner or outer canthus. This diagnosis is typically established through biopsy and histopathological examination.

• Ensure laterality is clearly documented as "right" and the specific eyelid (upper) is identified.
• Verify that the pathology report confirms Merkel cell carcinoma, not another type of eyelid malignancy.
• Consider additional codes for any associated metastases or subsequent treatment encounters.