ICD-10-CM · Chapter 17 · Q00-QA1
Q23 Congenital malformations of aortic and mitral valves
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| Q23..0 | Congenital stenosis of aortic valve | Yes |
| Q23..1 | Congenital insufficiency of aortic valve | Yes |
| Q23..2 | Congenital mitral stenosis | Yes |
| Q23..3 | Congenital mitral insufficiency | Yes |
| Q23..4 | Hypoplastic left heart syndrome | Yes |
| Q23..8 | Other congenital malformations of aortic and mitral valves | No |
| Q23..81 | Bicuspid aortic valve | Yes |
| Q23..82 | Congenital mitral valve cleft leaflet | Yes |
| Q23..88 | Other congenital malformations of aortic and mitral valves | Yes |
| Q23..9 | Congenital malformation of aortic and mitral valves, unspecified | Yes |
Last reviewed: September 2026