Q23.2 Congenital mitral stenosis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Applicable to

• Congenital mitral atresia

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 746.5 Congenital mitral stenosis

Code annotations containing back-references to Q23.2

Back-references to Q23.2

• 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 Q23.2

• Anomaly, anomalous (congenital) (unspecified type) › heart › valve NEC › mitral › stenosis
• Anomaly, anomalous (congenital) (unspecified type) › mitral (leaflets) (valve) › stenosis
• Atresia, atretic › mitral valve
• Deformity › mitral (leaflets) (valve) › parachute
• Deformity › mitral (leaflets) (valve) › stenosis, congenital
• Disease, diseased › Duroziez's (congenital mitral stenosis)
• Duroziez's disease (congenital mitral stenosis)
• Fusion, fused (congenital) › commissure, mitral valve
• Fusion, fused (congenital) › cusps, heart valve NEC › mitral
• Parachute mitral valve
• Stenosis, stenotic (cicatricial) › mitral (chronic) (inactive) (valve) › congenital
• Stenosis, stenotic (cicatricial) › valve (cardiac) (heart) › congenital › mitral
• Stricture › heart › valve › mitral
• Stricture › valve (cardiac) (heart) › congenital › mitral
• Supernumerary (congenital) › cusps, heart valve NEC › mitral
• Supernumerary (congenital) › mitral cusps

Nearby codes

• Q23 Congenital malformations of aortic and mitral valves
• Q23.0 Congenital stenosis of aortic valve
• Q23.1 Congenital insufficiency of aortic valve
• Q23.2 Congenital mitral stenosis (this code)
• 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
• Q23.82 Congenital mitral valve cleft leaflet