Q23.4: Hypoplastic left heart syndrome
Q23.4 is the billable ICD-10-CM diagnosis code for Hypoplastic left heart syndrome. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code Q23.4?
Q23.4 is the ICD-10-CM diagnosis code for Hypoplastic left heart syndrome. It belongs to category Q23 (Congenital malformations of aortic and mitral valves).
Is Q23.4 a billable code?
Yes. Q23.4 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does Q23.4 belong to?
Q23.4 is part of ICD-10-CM category Q23 — Congenital malformations of aortic and mitral valves, which has 18 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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