Q21
Non-billableCongenital malformations of cardiac septa
Q21 is the ICD-10-CM code for Congenital malformations of cardiac septa. It is a non-billable category code — use a more specific child code such as Q21.0 for billing.
- Status
- Header (non-billable)
- Chapter
- Q00-Q99
- Subcodes
- 7
- Edition
- FY2026
Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities
Excludes1 — not coded here
- •acquired cardiac septal defect (I51.0)
Frequently asked questions
- What is ICD-10 code Q21?
- Q21 is the ICD-10-CM code for "Congenital malformations of cardiac septa". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
- Is Q21 a billable code?
- No — Q21 is a non-billable header code. Use a more specific child code (such as Q21.0) for billing.
- What is excluded from Q21?
- Excludes1 (not coded here): acquired cardiac septal defect (I51.0).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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