ICD-10-CM category
C4A
C4A is a category, not a billable code. Report one of the 24 complete codes below (category title not published in the source file).
Codes in C4A
- C4A.0Merkel cell carcinoma of lip
- C4A.10Merkel cell carcinoma of unspecified eyelid, including canthus
- C4A.111Merkel cell carcinoma of right upper eyelid, including canthus
- C4A.112Merkel cell carcinoma of right lower eyelid, including canthus
- C4A.121Merkel cell carcinoma of left upper eyelid, including canthus
- C4A.122Merkel cell carcinoma of left lower eyelid, including canthus
- C4A.20Merkel cell carcinoma of unspecified ear and external auricular canal
- C4A.21Merkel cell carcinoma of right ear and external auricular canal
- C4A.22Merkel cell carcinoma of left ear and external auricular canal
- C4A.30Merkel cell carcinoma of unspecified part of face
- C4A.31Merkel cell carcinoma of nose
- C4A.39Merkel cell carcinoma of other parts of face
- 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
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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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