B33.21 Viral endocarditis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from B33.2 Viral carditis

Applicable to

• Coxsackie (virus) carditis

MS-DRG index

Defines the logic of DRG(s) 306-307 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 074.22 Coxsackie endocarditis (approximate)

Code annotations containing back-references to B33.21

Back-references to B33

• Code First: H67 Otitis media in diseases classified elsewhere ("viral disease NEC (B00-B34)")

Diagnosis Index entries for B33.21

• Coxsackie (virus) (infection) › endocarditis
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › Coxsackie

Nearby codes

• B33 Other viral diseases, not elsewhere classified
• B33.0 Epidemic myalgia
• B33.1 Ross River disease
• B33.2 Viral carditis
• B33.20 Viral carditis, unspecified
• B33.21 Viral endocarditis (this code)
• B33.22 Viral myocarditis
• B33.23 Viral pericarditis
• B33.24 Viral cardiomyopathy
• B33.3 Retrovirus infections, not elsewhere classified
• B33.4 Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]