ICD-10-CM diagnosis code
C4A.9 Merkel cell carcinoma, unspecified
- Billable
- Yes, a complete code (FY2026)
- Category
- C4A
- Chapter
- 2. Neoplasms
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Other codes in C4A
24 complete codes in this category.
- C4A.4Merkel cell carcinoma of scalp and neck
- C4A.51Merkel cell carcinoma of anal skin
- C4A.52Merkel cell carcinoma of skin of breast
- C4A.59Merkel cell carcinoma of other part of trunk
- C4A.60Merkel cell carcinoma of unspecified upper limb, including shoulder
- C4A.61Merkel cell carcinoma of right upper limb, including shoulder
- C4A.62Merkel cell carcinoma of left upper limb, including shoulder
- C4A.70Merkel cell carcinoma of unspecified lower limb, including hip
- C4A.71Merkel cell carcinoma of right lower limb, including hip
- C4A.72Merkel cell carcinoma of left lower limb, including hip
- C4A.8Merkel cell carcinoma of overlapping sites
- C4A.9Merkel cell carcinoma, unspecified
Documentation tips
- Make sure the note supports every element of the title, “Merkel cell carcinoma, unspecified”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to C4A.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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