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Q21.15

Billable

Inferior sinus venosus atrial septal defect

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

A birth defect where there is an abnormal opening in the wall between the upper heart chambers located in the lower part of the sinus venosus, the vein that returns blood to the right atrium.

Coding Tips

  • •Less common than superior sinus venosus ASD; ensure documentation specifically indicates inferior location
  • •May be associated with partial anomalous pulmonary venous return; review for concurrent cardiac defects

Code Hierarchy

└Q21Congenital malformations of cardiac septa└Q21.1Atrial septal defect└Q21.15Inferior sinus venosus atrial septal defect
└Q21.15Inferior sinus venosus atrial septal defect

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