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 | ✓ |
| Q23.0 | Congenital stenosis of aortic valve | ✓ |
| Q23.1 | Congenital insufficiency of aortic valve | ✓ |
| Q23.1 | Congenital insufficiency of aortic valve | ✓ |
| Q23.2 | Congenital mitral stenosis | ✓ |
| Q23.2 | Congenital mitral stenosis | ✓ |
| Q23.3 | Congenital mitral insufficiency | ✓ |
| Q23.3 | Congenital mitral insufficiency | ✓ |
| Q23.4 | Hypoplastic left heart syndrome | ✓ |
| Q23.4 | Hypoplastic left heart syndrome | ✓ |
| Q23.8 | Other congenital malformations of aortic and mitral valves | — |
| Q23.8 | Other congenital malformations of aortic and mitral valves | — |
| Q23.9 | Congenital malformation of aortic and mitral valves, unspecified | ✓ |
| Q23.9 | Congenital malformation of aortic and mitral valves, unspecified | ✓ |
| Q23.81 | Bicuspid aortic valve | ✓ |
| Q23.81 | Bicuspid aortic valve | ✓ |
| Q23.82 | Congenital mitral valve cleft leaflet | ✓ |
| Q23.82 | Congenital mitral valve cleft leaflet | ✓ |
| Q23.88 | Other congenital malformations of aortic and mitral valves | ✓ |
| Q23.88 | Other congenital malformations of aortic and mitral valves | ✓ |
Frequently asked questions
What is ICD-10-CM code Q23?
Q23 is an ICD-10-CM category covering Congenital malformations of aortic and mitral valves. It contains 20 more specific diagnosis codes, 18 of which are billable.
Is Q23 a billable code?
No — Q23 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example Q23.0 — Congenital stenosis of aortic valve). 18 of the 20 codes under Q23 are billable.
What codes fall under Q23?
Q23 includes Q23.0, Q23.0, Q23.1, Q23.1, Q23.2, plus 15 more. See the full list with descriptions and billable status above.
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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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