In simple words: This refers to a problem with the aortic valve in the heart that isn't caused by rheumatic fever. The exact nature of the valve problem isn't specified.

Nonrheumatic aortic valve disorder, unspecified. This code encompasses various non-rheumatic disorders of the aortic valve that are not further specified, including stenosis, insufficiency, and combined stenosis with insufficiency, when a more specific code is not available.

Example 1: A patient presents with shortness of breath and chest pain. After examination and echocardiography, a non-rheumatic aortic valve disorder is diagnosed, but the specific type (stenosis, insufficiency, or a combination) isn't clearly defined, thus I35.9 is used., A patient with a history of heart murmur undergoes an echocardiogram, revealing an abnormality of the aortic valve. However, the findings are not conclusive for stenosis or insufficiency, making I35.9 the appropriate code., A patient experiences symptoms suggestive of aortic valve disease. Diagnostic testing is inconclusive for a specific diagnosis, and further invasive testing is not currently indicated. I35.9 serves as a temporary code until a definitive diagnosis can be established.

Documentation should include details about the patient's symptoms, the findings from physical examination (including auscultation), and results of diagnostic tests such as echocardiograms, ECGs, and potentially cardiac catheterization. The non-rheumatic nature of the disorder should also be clearly documented.