I34.9 Nonrheumatic mitral valve disorder, unspecified

Billable ICD-10-CM code, FY2026.

Applies from I34 Nonrheumatic mitral valve disorders

Excludes1 (never code together)

• mitral valve disease (I05.9)
• mitral valve failure (I05.8)
• mitral valve stenosis (I05.0)
• mitral valve disorder of unspecified cause with diseases of aortic and/or tricuspid valve(s) (I08.-)
• mitral valve disorder of unspecified cause with mitral stenosis or obstruction (I05.0)
• mitral valve disorder specified as congenital (Q23.2, Q23.9)
• mitral valve disorder specified as rheumatic (I05.-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 424.0 Mitral valve disorders (approximate)

Code annotations containing back-references to I34.9

Back-references to I34

• Type 1 Excludes: I05 Rheumatic mitral valve diseases ("mitral valve disease specified as nonrheumatic (I34.-)")
• Type 2 Excludes: I08 Multiple valve diseases ("multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)")

Diagnosis Index entries for I34.9

• Disease, diseased › mitral (valve) › nonrheumatic

Nearby codes

• I34.1 Nonrheumatic mitral (valve) prolapse
• I34.2 Nonrheumatic mitral (valve) stenosis
• I34.8 Other nonrheumatic mitral valve disorders
• I34.81 Nonrheumatic mitral (valve) annulus calcification
• I34.89 Other nonrheumatic mitral valve disorders
• I34.9 Nonrheumatic mitral valve disorder, unspecified (this code)