ICD-10 Code I35.8 – Other nonrheumatic aortic valve disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I35.8 – Other nonrheumatic aortic valve disorders
What it is
I35.8 identifies nonrheumatic aortic valve problems that do not fit the more specific aortic valve codes. Use it for documented aortic valve disorders when rheumatic disease is not the cause.
Clinical signs
Clinical features vary; refer to documentation. Findings may include aortic valve abnormality on exam or imaging, with evidence of dysfunction or structural change that is not described by a more specific code.
When to use this code
Use I35.8 when the provider documents a nonrheumatic aortic valve disorder and no more specific aortic valve diagnosis is stated. It is appropriate when the record identifies an aortic valve condition but does not name stenosis, insufficiency, or another exact type.
Apply this code only after reviewing the note, imaging, and discharge summary for a clearer diagnosis. If the documentation supports a more specific code, report that code instead.
Do not use for
Do not use I35.8 for rheumatic aortic valve disease or for specific nonrheumatic aortic stenosis or insufficiency when those are documented. Check documentation.
Coding tip
If the chart says only “aortic valve disorder,” verify whether the provider meant a specific lesion before defaulting to I35.8.