ICD-10 Code I35.9 – Nonrheumatic aortic valve disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I35.9 – Nonrheumatic aortic valve disorder, unspecified
What it is
I35.9 identifies a nonrheumatic disorder of the aortic valve when the documentation does not specify the exact type. Use it for aortic valve disease not caused by rheumatic fever and not otherwise detailed.
Clinical signs
Clinical features vary; refer to documentation. Findings may include aortic valve abnormality on exam or imaging, such as a murmur or evidence of valve dysfunction, but the specific disorder is not named.
When to use this code
Use this code when the provider documents a nonrheumatic aortic valve disorder but does not identify stenosis, insufficiency, sclerosis, or another specific diagnosis. It also fits when the chart only states “aortic valve disorder” and no further detail is available.
Choose the more specific aortic valve code if the record names the lesion. If the cause or type is unclear, check documentation before defaulting to I35.9.
Do not use for
Do not use this code for rheumatic aortic valve disease or for a clearly documented specific aortic valve condition. Check documentation if the record identifies stenosis, regurgitation, or another named valve disorder.
Coding tip
Code I35.9 only when the aortic valve disorder is nonrheumatic and unspecified; specificity in the note should drive a more precise code.