2026
ICD-10-CM
Diagnosis
Code

Q21.13 Coronary sinus atrial septal defect

  • Billable
  • POA Exempt
  • 2023–2026

Q21.13 is a billable/specific and POA-exempt diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Coronary sinus atrial septal defect.

Inclusion term

  • Coronary sinus defect

  • Unroofed coronary sinus

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