C4A.0
ICD-10BillableMerkel cell carcinoma of lip
Official ICD-10-CM descriptor (FY2026)
Merkel cell carcinoma of lip
C4A.0 is valid for submission on a claim — CMS flags it as a billable, specific code.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- malignant neoplasm of vermilion border of lip (C00.0-C00.2)
Related codes in C4A
- C4A.1Merkel cell carcinoma of eyelid, including canthuscategory
- C4A.2Merkel cell carcinoma of ear and external auricular canalcategory
- C4A.3Merkel cell carcinoma of other and unspecified parts of facecategory
- C4A.4Merkel cell carcinoma of scalp and neck
- C4A.5Merkel cell carcinoma of trunkcategory
- C4A.6Merkel cell carcinoma of upper limb, including shouldercategory
- C4A.7Merkel cell carcinoma of lower limb, including hipcategory
- C4A.8Merkel cell carcinoma of overlapping sites
- C4A.9Merkel cell carcinoma, unspecified
Where this code sits
- Chapter
- 2. Neoplasms (C00-D49)
- Parent code
- C4A
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.