I35.9 Nonrheumatic aortic valve disorder, unspecified

Billable ICD-10-CM code, FY2026.

Applies from I35 Nonrheumatic aortic valve disorders

Excludes2 (not included here)

• aortic valve disorder of unspecified cause but with diseases of mitral and/or tricuspid valve(s) (I08.-)
• aortic valve disorder specified as congenital (Q23.0, Q23.1)
• aortic valve disorder specified as rheumatic (I06.-)
• hypertrophic subaortic stenosis (I42.1)

Code also

• , if applicable, bicuspid aortic valve (Q23.81)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 424.1 Aortic valve disorders (approximate)

Code annotations containing back-references to I35.9

Back-references to I35

• Type 1 Excludes: I06 Rheumatic aortic valve diseases ("aortic valve disease not specified as rheumatic (I35.-)")
• Type 2 Excludes: I08 Multiple valve diseases ("multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)")
• Code First: I5A Non-ischemic myocardial injury (non-traumatic) ("nonrheumatic aortic valve disorders (I35.-)")

Diagnosis Index entries for I35.9

• Disease, diseased › aortic (heart) (valve)
• Disease, diseased › heart (organic) › aortic (valve)
• Lesion (s) (nontraumatic) › aortic (valve)

Nearby codes

• I35 Nonrheumatic aortic valve disorders
• I35.0 Nonrheumatic aortic (valve) stenosis
• I35.1 Nonrheumatic aortic (valve) insufficiency
• I35.2 Nonrheumatic aortic (valve) stenosis with insufficiency
• I35.8 Other nonrheumatic aortic valve disorders
• I35.9 Nonrheumatic aortic valve disorder, unspecified (this code)