ICD-10-CM C4A.121: Merkel cell carcinoma of left upper eyelid, including canthus

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About ICD-10-CM Code C4A.121 (Merkel cell carcinoma of left upper eyelid)

ICD-10-CM code C4A.121 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM C4A.121 became effective on October 1, 2024.

This page provides detailed information about C4A.121 - Merkel cell carcinoma of left upper eyelid, including canthus. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Merkel cell carcinoma of left upper eyelid related to including canthus.