B33.21Billable
Viral endocarditis
- Chapter
- 1. Certain infectious and parasitic diseases
- Category
- B33
- Effective date
- October 1, 2026
Related codes in category B33
B33Other viral diseases, not elsewhere classifiedB33.0Epidemic myalgiaYesB33.1Ross River diseaseYesB33.2Viral carditisB33.20Viral carditis, unspecifiedYesB33.22Viral myocarditisYesB33.23Viral pericarditisYesB33.24Viral cardiomyopathyYesB33.3Retrovirus infections, not elsewhere classifiedYesB33.4Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]YesB33.8Other specified viral diseasesYes
Frequently asked questions
What is ICD-10 code B33.21?
B33.21 is an ICD-10-CM diagnosis code for Viral endocarditis.
Is B33.21 a billable code?
Yes. B33.21 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is B33.21 in?
B33.21 falls under Chapter 1: Certain infectious and parasitic diseases.
When did B33.21 become effective?
B33.21 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to B33.21?
B33.21 belongs to category B33, which includes 11 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.