Q23
Congenital malformations of aortic and mitral valves
Q23 is a non-billable ICD-10-CM code category for congenital malformations of aortic and mitral valves. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Q23.0 Congenital stenosis of aortic valve, Q23.1 Congenital insufficiency of aortic valve, Q23.2 Congenital mitral stenosis, Q23.3 Congenital mitral insufficiency and 3 more. Its coding notes include 1 Excludes2 entry.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
More specific codes under Q23 7
- 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 valvesHeader
- Q23.9Congenital malformation of aortic and mitral valves, unspecifiedBillable