Q21.3

HCC Category Mapping

What This Code Means

A birth defect consisting of four heart abnormalities: a hole between the lower heart chambers, thickened right lower chamber muscle, misalignment of the aorta, and narrowing of the pulmonary valve.

Coding Tips

• •Tetralogy of Fallot (TOF) is a complex defect; all four components should be present for this diagnosis; do not use if only some components are present
• •Document severity and any associated complications such as cyanosis or right ventricular hypertrophy

Clinical Significance

Tetralogy of Fallot is a complex cyanotic congenital heart defect consisting of four components: ventricular septal defect, pulmonary stenosis, overriding aorta, and right ventricular hypertrophy. This condition requires surgical repair in infancy and lifelong cardiac monitoring for potential complications including arrhythmias and sudden cardiac death.

Documentation Requirements

• ✓Echocardiographic confirmation of all four tetralogy components
• ✓Degree of pulmonary stenosis and right outflow obstruction
• ✓Assessment of cyanosis and oxygen saturation levels
• ✓Surgical repair history and type of intervention
• ✓Current cardiac function and exercise capacity
• ✓Arrhythmia monitoring and management
• ✓Pulmonary valve function assessment
• ✓Long-term complications and follow-up needs

Commonly Confused Codes