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Q21.11

Billable

Secundum atrial septal defect

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

What This Code Means

A hole in the middle portion of the wall between the two upper chambers of the heart, the most common type of atrial septal defect.

Coding Tips

  • •Secundum ASDs are the most frequently diagnosed type; ensure documentation specifies this location for accurate coding
  • •Document any associated defects such as partial anomalous pulmonary venous return which may require additional codes

Code Hierarchy

└Q21Congenital malformations of cardiac septa└Q21.1Atrial septal defect└Q21.11Secundum atrial septal defect
└Q21.11Secundum atrial septal defect

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