Q21.11
Secundum atrial septal defect
Billable 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 2
Q21.11code
Inclusion terms
- Fenestrated atrial septum
- Patent or persistent ostium secundum defect (type II)
Index entries leading here 6
- Defect, defective Q89.9
- Fenestration, fenestrated — see also Imperfect, closure
- atrial septum Q21.11
- Imperfect
- closure (congenital)
- atrium (secundum) Q21.11
- closure (congenital)
- Persistence, persistent (congenital)
- ostium
- secundum Q21.11
- ostium
- Ostium
- secundum (arteriosum) (defect) (patent) (persistent) Q21.11
- Patent — see also Imperfect, closure
- ostium secundum (type II) Q21.11
Alongside this code 7 same parent — Q21.1
Q21.10 Atrial septal defect, unspecified 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.