Q21.13
Coronary sinus 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
Q21.13code
Inclusion terms
- Coronary sinus defect
- Unroofed coronary sinus
Index entries leading here 2
Alongside this code 7 same parent — Q21.1
Q21.10 Atrial septal defect, unspecified Q21.11 Secundum atrial septal defect Q21.12 Patent foramen ovale 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.