Is C4A.31 a billable code?
Yes. C4A.31 is a billable ICD-10-CM code and can be used on claims and superbills for dates of service from October 1, 2026 to September 30, 2027.
ICD-10-CM FY2027 diagnosis code
C4A.31: Merkel cell carcinoma of nose
Billable codeValid for dates of service October 1, 2026 to September 30, 2027
C4A.31 is a billable ICD-10-CM diagnosis code for merkel cell carcinoma of nose. It is specific enough to use on an insurance claim, a superbill or a Good Faith Estimate.
Superbill GeneratorStart a superbill with C4A.31 already added.Good Faith EstimateStart a cost estimate with C4A.31 already added.CMS-1500 Claim FormFill a claim form with C4A.31 in box 21.
Other codes in C4A.3 Merkel cell carcinoma of other and unspecified parts of face
C4A.31 questions
What does C4A.31 mean?
C4A.31 is the ICD-10-CM code for Merkel cell carcinoma of nose. It is in chapter 2, Neoplasms (C00-D49).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.