C4A.8
Billable codeMerkel cell carcinoma of overlapping sites
The ICD-10 code for merkel cell carcinoma of overlapping sites is C4A.8.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- C4A.0Merkel cell carcinoma of lip
- C4A.1Merkel cell carcinoma of eyelid, including canthusnon-billable header
- C4A.2Merkel cell carcinoma of ear and external auricular canalnon-billable header
- C4A.3Merkel cell carcinoma of other and unspecified parts of facenon-billable header
- C4A.4Merkel cell carcinoma of scalp and neck
- C4A.5Merkel cell carcinoma of trunknon-billable header
- C4A.6Merkel cell carcinoma of upper limb, including shouldernon-billable header
- C4A.7Merkel cell carcinoma of lower limb, including hipnon-billable header
- C4A.9Merkel cell carcinoma, unspecified
- C4A.8Merkel cell carcinoma of overlapping sites
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 20936Approximate match
Associated MS-DRGs
C4A.8 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.
- DRG 564Other Musculoskeletal System and Connective Tissue Diagnoses with MCC
- DRG 565Other Musculoskeletal System and Connective Tissue Diagnoses with CC
- DRG 566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC
- DRG 595Major Skin Disorders with MCC
- DRG 596Major Skin Disorders without MCC