Q21.22

Billable

Transitional atrioventricular septal defect

HCC Category Mapping

RxHCCHCC 191 — Congenital Heart/Circulatory Disorders and Fontan Circulation

0.000

What This Code Means

A birth defect where there is an intermediate form of abnormal opening in the wall between the upper and lower heart chambers, with characteristics between partial and complete defects.

Coding Tips

•Transitional AVSD is a distinct category; ensure documentation specifically indicates this intermediate form rather than partial or complete
•Review surgical or echocardiographic findings to confirm the transitional nature of the defect

Clinical Significance

Transitional atrioventricular septal defect represents an intermediate form between partial and complete defects, with characteristics of both types. This condition requires careful evaluation to determine the optimal surgical approach and timing for intervention.

Documentation Requirements

✓Detailed echocardiographic assessment of defect characteristics
✓Evaluation of both partial and complete defect features
✓Assessment of atrioventricular valve morphology and function
✓Hemodynamic impact and shunt assessment
✓Associated cardiac anomalies
✓Surgical planning considerations
✓Current cardiac function and symptoms
✓Growth and development monitoring

Commonly Confused Codes

Q21.21 — partial atrioventricular septal defect Q21.23 — complete atrioventricular septal defect Q21.0 — ventricular septal defect Q21.1 — atrial septal defect Q22.4 — congenital tricuspid stenosis

Code Hierarchy

└Q21Congenital malformations of cardiac septa └Q21.2Atrioventricular septal defect └Q21.22Transitional atrioventricular septal defect

└Q21.22Transitional atrioventricular septal defect