C4A.8
BillableMerkel cell carcinoma of overlapping sites
Merkel cell carcinoma of overlapping sites
Cross-references
UMLS
Related Codes(9)
C4A.0Merkel cell carcinoma of lip
C4A.1Merkel cell carcinoma of eyelid, including canthus
C4A.2Merkel cell carcinoma of ear and external auricular canal
C4A.3Merkel cell carcinoma of other and unspecified parts of face
C4A.4Merkel cell carcinoma of scalp and neck
C4A.5Merkel cell carcinoma of trunk
C4A.6Merkel cell carcinoma of upper limb, including shoulder
C4A.7Merkel cell carcinoma of lower limb, including hip
C4A.9Merkel cell carcinoma, unspecified
How C4A.8 differs from sibling codes
All children of C4A share the same parent. The wording below is what mechanically separates each sibling from C4A.8.
C4A.0BillableMerkel cell carcinoma of lip
Specifier: "lip" vs. "overlapping sites" in C4A.8.
C4A.1Merkel cell carcinoma of eyelid, including canthus
Specifier: "eyelid, including canthus" vs. "overlapping sites" in C4A.8.
C4A.2Merkel cell carcinoma of ear and external auricular canal
Specifier: "ear and external auricular canal" vs. "overlapping sites" in C4A.8.
C4A.3Merkel cell carcinoma of other and unspecified parts of face
Specifier: "other and unspecified parts of face" vs. "overlapping sites" in C4A.8.
C4A.4BillableMerkel cell carcinoma of scalp and neck
Specifier: "scalp and neck" vs. "overlapping sites" in C4A.8.
C4A.5Merkel cell carcinoma of trunk
Specifier: "trunk" vs. "overlapping sites" in C4A.8.
C4A.6Merkel cell carcinoma of upper limb, including shoulder
Specifier: "upper limb, including shoulder" vs. "overlapping sites" in C4A.8.
C4A.7Merkel cell carcinoma of lower limb, including hip
Specifier: "lower limb, including hip" vs. "overlapping sites" in C4A.8.
C4A.9BillableMerkel cell carcinoma, unspecified
Specifier: "unspecified" vs. "of overlapping sites" in C4A.8.
Also Known As / Clinical Terms(2)
Common questions
What is the ICD-10-CM code for Merkel cell carcinoma of overlapping sites?
Merkel cell carcinoma of overlapping sites is coded as C4A.8 in ICD-10-CM.
What is ICD-10 code C4A.8?
C4A.8 is the ICD-10-CM identifier for Merkel cell carcinoma of overlapping sites. It is included in the official 2025 release of ICD-10-CM published by CMS and NCHS.
Is C4A.8 a billable code?
Yes, C4A.8 is a billable / specific ICD-10-CM code that can be used to indicate a diagnosis on a medical claim.
What is the parent code of C4A.8?
C4A.8 sits under C4A (Merkel cell carcinoma) in the ICD-10-CM hierarchy.
What chapter does C4A.8 belong to?
C4A.8 is in Chapter 2: Neoplasms.
Why are there no recorded synonyms for C4A.8?
C4A.8 is a precise ICD-10-CM diagnosis with no widely-used alternate phrasings; the description itself is the canonical surface form for billing and EHR queries.
What is the UMLS mapping for C4A.8?
C4A.8 maps to UMLS C2842074.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.