C4A.3 Merkel cell carcinoma of other and unspecified parts of face

The ICD-10-CM code for Merkel cell carcinoma of other and unspecified parts of face is C4A.3 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C43-C44: Melanoma and other malignant neoplasms of skin (C43-C44)

Category C4A

33 codes (24 billable)

FY2026 Status

Stable since FY2024

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool