Q23.9 Congenital malformation of aortic and mitral valves, unspecified

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

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 746.89 Other specified congenital anomalies of heart (approximate)

Code annotations containing back-references to Q23.9

Back-references to Q23.9

• Type 1 Excludes: I34 Nonrheumatic mitral valve disorders ("mitral valve disorder specified as congenital (Q23.2, Q23.9)")

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 Q23.9

• Anomaly, anomalous (congenital) (unspecified type) › aortic cusp or valve
• Anomaly, anomalous (congenital) (unspecified type) › mitral (leaflets) (valve)
• Malformation (congenital) › aortic valve
• Malformation (congenital) › mitral valve

Nearby codes

• Q23.4 Hypoplastic left heart syndrome
• Q23.8 Other congenital malformations of aortic and mitral valves
• Q23.81 Bicuspid aortic valve
• 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 (this code)