ICD-10 Code I34.0 – Nonrheumatic mitral (valve) insufficiency (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I34.0 – Nonrheumatic mitral (valve) insufficiency
What it is
This code identifies mitral valve regurgitation that is not caused by rheumatic heart disease. Blood leaks backward from the left ventricle into the left atrium because the mitral valve does not close properly.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a systolic murmur, palpitations, shortness of breath, or fatigue, and echocardiography is often used to confirm valve insufficiency.
When to use this code
Use I34.0 when the provider documents nonrheumatic mitral insufficiency, mitral regurgitation, or mitral valve incompetence. Apply it when the valve leak is the primary documented diagnosis and rheumatic disease is not the cause. Check documentation if the note only says “mitral valve disease” without specifying insufficiency.
Do not use for
Do not use this code for rheumatic mitral valve disease or for mitral stenosis. If the record describes a different mitral disorder or the cause is unclear, check documentation.
Coding tip
Confirm that the condition is nonrheumatic and specifically documented as insufficiency or regurgitation before assigning I34.0.