Skip to content
HCC Buddy home

Q21.4

Billable

Aortopulmonary 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 between the aorta and pulmonary artery, allowing blood to flow between these two major vessels.

Coding Tips

  • •This is a specific type of septal defect; do not use the unspecified code Q21.9 if this diagnosis is documented
  • •May require additional codes for associated cardiac conditions or complications

Code Hierarchy

└Q21Congenital malformations of cardiac septa└Q21.4Aortopulmonary septal defect
└Q21.4Aortopulmonary septal defect

Open Q21.4 in the Interactive Encoder

See full code details, AI coding tips, HCC mappings, and related codes in our interactive encoder. Start your 14-day Pro trial — no credit card required.

Open in EncoderStart 14-Day Pro Trial