Is C4A.8 a billable ICD-10-CM code?

Yes. C4A.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does C4A.8 sit in the tabular list?

Neoplasms (C00-D49), in the block Melanoma and other malignant neoplasms of skin (C43-C44).

C4A.8

C4A.8 — Merkel cell carcinoma of overlapping sites

Billable / specific codeICD-10-CM

C4A.8 is a billable, specific ICD-10-CM code for merkel cell carcinoma of overlapping sites. It is valid for submission on a claim.

Risk adjustment

C4A.8 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 21 Lymphoma and Other Cancers0.671 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

C4A.8 is named in 49 Medicare coverage policies — 49 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52479Oral Anticancer Drugs - Policy Article
A52479Oral Anticancer Drugs - Policy Article
A52479Oral Anticancer Drugs - Policy Article
A52480Oral Antiemetic Drugs (Replacement for Intravenous Antiemetics) - Policy Article

How C4A.8 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to C4A.8.

Carcinoma›Merkel cell›overlapping sites

Related codes at this level

Codes that share C4A. If C4A.8 is not quite right, the correct code is usually one of these.

Questions about C4A.8

Is C4A.8 a billable ICD-10-CM code?: Yes. C4A.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does C4A.8 sit in the tabular list?: Neoplasms (C00-D49), in the block Melanoma and other malignant neoplasms of skin (C43-C44).