Q20.4

HCC Category Mapping

What This Code Means

A congenital heart condition where both upper chambers of the heart drain into a single lower chamber instead of the normal two separate chambers.

Coding Tips

• •Document whether this is a complete or partial form of the defect, as severity affects management
• •Often associated with other cardiac malformations; check for coexisting defects like atrial septal defects

Clinical Significance

Double inlet ventricle represents a complex functional single ventricle where both atria drain into one ventricular chamber, requiring staged surgical palliation to establish single ventricle circulation. This condition has significant long-term implications and requires lifelong specialized cardiac care.

Documentation Requirements

• ✓Echocardiographic confirmation of both atria draining into single ventricle
• ✓Assessment of ventricular function and morphology
• ✓Associated cardiac anomalies
• ✓Staged surgical intervention history (Norwood, Glenn, Fontan)
• ✓Current functional status and exercise tolerance
• ✓Hemodynamic assessment and pressures
• ✓Arrhythmia monitoring and anticoagulation status
• ✓Long-term complications and management

Commonly Confused Codes