Q23
Congenital malformations of aortic and mitral valves
Header / non-billable
Choose the additional character
Q23 needs more characters to be billable. Pick the specific code below.
- Q23.0Congenital stenosis of aortic valveBillable
- Q23.1Congenital insufficiency of aortic valveBillable
- Q23.2Congenital mitral stenosisBillable
- Q23.3Congenital mitral insufficiencyBillable
- Q23.4Hypoplastic left heart syndromeBillable
- Q23.8Other congenital malformations of aortic and mitral valvesMore levels
- Q23.9Congenital malformation of aortic and mitral valves, unspecifiedBillable
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities
Excludes 2
inborn errors of metabolism (E70-E88)
Note
Codes from this chapter are not for use on maternal records
Official Guidelines for Q23
FY 2026 ›Sections that reference Q23
Sections whose FY 2026 text names Q23, its Q23 category, or a range containing it — the chapter guidance above is the authoritative source.