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Q21.1

Non-billable

Atrial septal defect

Q21.1 is the ICD-10-CM code for Atrial septal defect. It is a non-billable category code — use a more specific child code such as Q21.10 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Parent
Q21
Subcodes
8
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

Excludes2 — not included here

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

Frequently asked questions

What is ICD-10 code Q21.1?
Q21.1 is the ICD-10-CM code for "Atrial septal defect". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q21.1 a billable code?
No — Q21.1 is a non-billable header code. Use a more specific child code (such as Q21.10) for billing.
What are the subcodes of Q21.1?
Q21.1 has 8 more specific child codes, including Q21.10, Q21.11, Q21.12.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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