C4A.6 Merkel cell carcinoma of upper limb, including shoulder

The ICD-10-CM code for Merkel cell carcinoma of upper limb, including shoulder is C4A.6 (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

Also Known As

ICD-10-CM Alphabetic Index entries that lead to C4A.6:

• Carcinoma (malignant) › Merkel cell › upper limb, including shoulder
• Carcinoma (malignant) › Merkel cell › shoulder

References

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