Q23: Congenital malformations of aortic and mitral valves

Codes under Q23 (Congenital malformations of aortic and mitral valves). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
Q23.0	Congenital stenosis of aortic valve	✓
Q23.1	Congenital insufficiency of aortic valve	✓
Q23.2	Congenital mitral stenosis	✓
Q23.3	Congenital mitral insufficiency	✓
Q23.4	Hypoplastic left heart syndrome	✓
Q23.8	Other congenital malformations of aortic and mitral valves	—
Q23.9	Congenital malformation of aortic and mitral valves, unspecified	✓
Q23.81	Bicuspid aortic valve	✓
Q23.82	Congenital mitral valve cleft leaflet	✓
Q23.88	Other congenital malformations of aortic and mitral valves	✓

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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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