B33.24
BillableViral cardiomyopathy
HCC Category Mapping
V28HCC 227 — Cardiomyopathy
0.339V24HCC 85 — Congestive Heart Failure
0.368ESRDHCC 85 — Congestive Heart Failure
0.000RxHCCHCC 186 — Heart Failure
0.000What This Code Means
Viral cardiomyopathy is weakening of the heart muscle caused by a viral infection, which reduces the heart's ability to pump blood throughout the body.
Coding Tips
- •Document the ejection fraction or functional class if available to indicate severity
- •Specify if this is acute or chronic cardiomyopathy, as this affects treatment and prognosis
Clinical Significance
Viral cardiomyopathy is heart muscle disease caused by viral infection, most commonly coxsackievirus B, adenovirus, or parvovirus B19. It is a leading cause of dilated cardiomyopathy in younger patients and can progress to heart failure requiring transplant. Accurate capture reflects both the infectious etiology and the cardiac dysfunction burden.
Documentation Requirements
- ✓Viral etiology confirmed or strongly suspected (endomyocardial biopsy with viral PCR, or clinical diagnosis with supporting serology)
- ✓Echocardiographic findings: left ventricular ejection fraction, chamber dimensions, wall motion abnormalities
- ✓Heart failure classification if applicable (NYHA class I-IV)
- ✓Specific virus identified if known (coxsackievirus, adenovirus, parvovirus, influenza, SARS-CoV-2)
- ✓Treatment plan: heart failure medications, activity restrictions, cardiac monitoring
Commonly Confused Codes
I42.0 (Dilated cardiomyopathy) — Idiopathic or non-infectious dilated cardiomyopathy; B33.24 specifies viral etiologyI40.0 (Infective myocarditis) — Acute myocarditis is inflammation; cardiomyopathy implies structural/functional changes that may persist after acute inflammation resolvesI25.5 (Ischemic cardiomyopathy) — Heart muscle disease from coronary artery disease, not viral infection
Code Hierarchy
└B33Other viral diseases, not elsewhere classified└B33.2Viral carditis└B33.24Viral cardiomyopathy
└B33.24Viral cardiomyopathy