2026
ICD-10-CM
Diagnosis
Code

Q21.1 Atrial septal defect

  • Non-billable
  • 2016–2026

Q21.1 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Atrial septal defect.

Type 2 excludes

  • Ostium primum atrial septal defect (type I) (Q21.20)

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