C4A

Non-billable

Merkel cell carcinoma

C4A is the ICD-10-CM code for Merkel cell carcinoma. It is a non-billable category code — use a more specific child code such as C4A.0 for billing.

Status
Header (non-billable)
Chapter
C00-D49
Subcodes
10
Edition
FY2026

C00-D49 Neoplasms

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code C4A?
C4A is the ICD-10-CM code for "Merkel cell carcinoma". It falls under C00-D49 Neoplasms.
Is C4A a billable code?
No — C4A is a non-billable header code. Use a more specific child code (such as C4A.0) for billing.
What are the subcodes of C4A?
C4A has 10 more specific child codes, including C4A.0, C4A.1, C4A.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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