Q23.81 Bicuspid aortic valve

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applicable to

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

Code also

• , if applicable, acquired aortic valve disorders, such as:
• aortic (valve) insufficiency (nonrheumatic) (I35.1)
• aortic (valve) stenosis (nonrheumatic) (I35.0)
• aortic (valve) stenosis with insufficiency (nonrheumatic) (I35.2)

MS-DRG index

Defines the logic of DRG(s) 306-307 in MDC 05.

Code annotations containing back-references to Q23.81

Back-references to Q23.81

• Code Also: I35 Nonrheumatic aortic valve disorders (", if applicable, bicuspid aortic valve (Q23.81)")

Back-references to Q23

• Type 2 Excludes: I08 Multiple valve diseases ("multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)")
• Code Also: I27.21 Secondary pulmonary arterial hypertension ("congenital heart disease (Q20-Q28)")
• Type 2 Excludes: P29 Cardiovascular disorders originating in the perinatal period ("congenital malformations of the circulatory system (Q20-Q28)")
• Code Also: Z71.87 Encounter for pediatric-to-adult transition counseling ("congenital malformations of the circulatory system (Q20-Q28)")

Diagnosis Index entries for Q23.81

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

Nearby codes

• Q23.1 Congenital insufficiency of aortic valve
• Q23.2 Congenital mitral stenosis
• Q23.3 Congenital mitral insufficiency
• Q23.4 Hypoplastic left heart syndrome
• Q23.8 Other congenital malformations of aortic and mitral valves
• Q23.81 Bicuspid aortic valve (this code)
• Q23.82 Congenital mitral valve cleft leaflet
• Q23.88 Other congenital malformations of aortic and mitral valves
• Q23.9 Congenital malformation of aortic and mitral valves, unspecified