ICD-10 Code I35.0 – Nonrheumatic aortic (valve) stenosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I35.0 – Nonrheumatic aortic (valve) stenosis
What it is
I35.0 identifies narrowing of the aortic valve that is not caused by rheumatic heart disease. Use it when documentation states aortic valve stenosis and excludes a rheumatic cause.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a systolic murmur, exertional dyspnea, chest discomfort, syncope, or evidence of left ventricular outflow obstruction on imaging.
When to use this code
Use I35.0 when the provider documents nonrheumatic aortic stenosis, aortic valve stenosis, or calcific aortic stenosis without mentioning rheumatic disease. Apply it for confirmed diagnosis in office notes, discharge summaries, or problem lists.
If the record only says “aortic stenosis,” verify that rheumatic disease is not the cause before coding. Check documentation when the etiology, severity, or valve involvement is unclear.
Do not use for
Do not use I35.0 for rheumatic aortic stenosis or for unspecified valvular disease without clear aortic valve involvement. Check documentation if the note describes multiple valve lesions.
Coding tip
Confirm the valve and cause: “aortic” plus “nonrheumatic” supports I35.0.