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B33.21

B33.21: Viral endocarditis

Billable / specific codeICD-10-CM

B33.21 is a billable, specific ICD-10-CM code for viral endocarditis. It is valid for submission on a claim.

Check B33.21 with the rest of the claim: free scrubber

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

B33.21 is named in 6 Medicare coverage policies: 6 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
  • A56500Billing and Coding: Cardiac Catheterization and Coronary Angiography
  • A56625Billing and Coding: Echocardiography
  • A56781Billing and Coding: Transthoracic Echocardiography (TTE)

Alphabetic index entries that lead here

  • Coxsackie›endocarditis
  • Endocarditis›Coxsackie

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under B33.2

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.