Q23.81 Bicuspid aortic valve

The ICD-10-CM code for Bicuspid aortic valve is Q23.81 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

17: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

Section

Q20-Q28: Congenital malformations of the circulatory system (Q20-Q28)

Category Q23

11 codes (9 billable)

FY2026 Status

Introduced in FY2025

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q23.81:

• Unicuspid aortic valve (at birth) (congenital)
• Bicuspid aortic valve (at birth) (congenital)
• Anomaly, anomalous (congenital) (unspecified type) › heart › valve NEC › aortic › bicuspid valve

Inclusion Terms

• Congenital bicuspid aortic valve
• Unicuspid (congenital) aortic valve (at birth)

Official Coding Guidelines

POA indicator for congenital conditions/anomalies and Q00-Q99 exception

Congenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. Congenital conditions are always considered present on admission.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool