Q21.1
Atrial septal defect
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 2 never code together
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes
No further instructional notes apply.
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 6 same parent — Q21
Subordinate codes 8
Q21.10 Atrial septal defect, unspecified Q21.11 Secundum atrial septal defect Q21.12 Patent foramen ovale Q21.13 Coronary sinus atrial septal defect Q21.14 Superior sinus venosus atrial septal defect Q21.15 Inferior sinus venosus atrial septal defect Q21.16 Sinus venosus atrial septal defect, unspecified Q21.19 Other specified atrial septal defect
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.