ICD-10 Code B33.24 – Viral cardiomyopathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B33.24 – Viral cardiomyopathy
What it is
Viral cardiomyopathy is heart muscle disease linked to a viral infection. Use this code when documentation identifies cardiomyopathy as viral in origin.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include heart failure symptoms, reduced cardiac function, or evidence of myocarditis-related myocardial damage.
When to use this code
Use B33.24 when the provider documents viral cardiomyopathy or clearly attributes cardiomyopathy to a viral cause. It may also apply when the record states viral myocardial involvement with cardiomyopathy as the diagnosis. Check documentation if the note only says myocarditis, cardiomyopathy, or viral infection without a direct link.
Do not use for
Do not use this code for nonviral cardiomyopathy types, such as dilated or hypertrophic cardiomyopathy, unless the viral cause is documented. Also avoid it when the diagnosis is only suspected or not clearly stated.
Coding tip
Look for explicit provider wording that connects the cardiomyopathy to a viral cause before assigning B33.24.