C4A is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Merkel cell carcinoma.
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Merkel cell carcinoma of lip
Merkel cell carcinoma of eyelid, including canthus
Merkel cell carcinoma of ear and external auricular canal
Merkel cell carcinoma of other and unspecified parts of face
Merkel cell carcinoma of scalp and neck
Merkel cell carcinoma of trunk
Merkel cell carcinoma of upper limb, including shoulder
Merkel cell carcinoma of lower limb, including hip
Merkel cell carcinoma of overlapping sites
Merkel cell carcinoma, unspecified
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