ICD-10 Code I34 – Nonrheumatic mitral valve disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I34 – Nonrheumatic mitral valve disorders
What it is
I34 identifies disorders of the mitral valve that are not caused by rheumatic heart disease. Use it for nonrheumatic mitral valve conditions such as prolapse, insufficiency, or other documented valve abnormalities.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a heart murmur, abnormal echocardiogram results, or signs of mitral valve dysfunction such as regurgitation or prolapse.
When to use this code
Use I34 when the provider documents a nonrheumatic mitral valve disorder and does not specify a more exact code. It fits cases where imaging or exam confirms mitral valve abnormality without rheumatic cause. If the record names a specific condition, code that condition instead.
Do not use for
Do not use I34 for rheumatic mitral valve disease or for disorders of other valves. If documentation is unclear about the cause or valve involved, check documentation before coding.
Coding tip
Look for the exact valve, the nonrheumatic cause, and any more specific mitral valve diagnosis before assigning I34.