10ICD Code Hub

C4A

Header — not billable

Merkel cell carcinoma

The ICD-10 code for merkel cell carcinoma is C4A.

C4A is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 10 more specific codes below.

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

Child codes under C4A

Related codes in this category