ICD-10 Code I35 – Nonrheumatic aortic valve disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I35 – Nonrheumatic aortic valve disorders
What it is
I35 identifies disorders of the aortic valve that are not caused by rheumatic fever. Use it for documented nonrheumatic valve disease, such as stenosis, insufficiency, or mixed aortic valve disease when the record supports that diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a heart murmur, echocardiographic evidence of aortic valve narrowing or leakage, or symptoms such as dyspnea, chest discomfort, or syncope when disease is clinically significant.
When to use this code
Use I35 when the provider documents a nonrheumatic aortic valve disorder and does not specify a more exact code in the category. This code may apply to chronic aortic valve disease identified on imaging, examination, or follow-up assessment. Check documentation for the specific valve lesion and whether rheumatic disease is excluded.
Do not use for
Do not use I35 for rheumatic aortic valve disease, which is coded elsewhere. Do not assign it for congenital aortic valve disorders or for nonspecific heart murmurs without a documented valve diagnosis.
Coding tip
Look for the exact valve diagnosis in the note and code the most specific nonrheumatic aortic valve condition documented.