ICD-10 Code I35.1 – Nonrheumatic aortic (valve) insufficiency (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I35.1 – Nonrheumatic aortic (valve) insufficiency
What it is
I35.1 identifies leakage of the aortic valve that is not caused by rheumatic fever. Blood flows backward from the aorta into the left ventricle because the valve does not close properly.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a diastolic murmur, signs of left ventricular volume overload, or echo evidence of aortic regurgitation without rheumatic disease.
When to use this code
Use this code when the provider documents nonrheumatic aortic valve insufficiency, aortic regurgitation, or aortic incompetence and the cause is not rheumatic. It also fits confirmed cases identified by echocardiography or specialist assessment. Check documentation if the etiology is unclear.
Do not use for
Do not use it for rheumatic aortic valve disease or when the record only says “aortic stenosis.” If the valve problem is congenital, traumatic, or unspecified, choose the documented condition instead.
Coding tip
Confirm that “nonrheumatic” is documented, because ICD-10-CM separates this code from rheumatic valve disorders.