Q21.0

Billable

Ventricular septal defect

HCC Category Mapping

RxHCCHCC 191 — Congenital Heart/Circulatory Disorders and Fontan Circulation

0.000

What This Code Means

A hole in the wall separating the two lower chambers of the heart, allowing blood to flow abnormally between them.

Coding Tips

•Document the size and location of the defect (muscular, membranous, inlet, outlet) when available for more specific coding if needed
•Note whether the defect is isolated or associated with other cardiac anomalies, as this affects clinical management and coding

Clinical Significance

Ventricular septal defect is the most common congenital heart defect, involving a hole in the wall between the heart's lower chambers. While small defects may close spontaneously, larger defects can lead to heart failure and require surgical intervention to prevent long-term complications.

Documentation Requirements

✓Echocardiographic confirmation of ventricular septal defect
✓Size and location of the defect
✓Hemodynamic significance and shunt direction
✓Associated cardiac anomalies
✓Signs of heart failure or pulmonary hypertension
✓Surgical closure history if performed
✓Current cardiac function and exercise tolerance
✓Growth and development assessment in children

Commonly Confused Codes

Q21.1 — atrial septal defect Q21.2 — atrioventricular septal defect Z95.89 — presence of other cardiac implants (post-surgical)I25.2 — old myocardial infarction Q22.1 — congenital pulmonary valve stenosis

Code Hierarchy

└Q21Congenital malformations of cardiac septa └Q21.0Ventricular septal defect

└Q21.0Ventricular septal defect