ICD-10 Code I34.2 – Nonrheumatic mitral (valve) stenosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I34.2 – Nonrheumatic mitral (valve) stenosis
What it is
This code identifies narrowing of the mitral valve that is not caused by rheumatic heart disease. It describes reduced blood flow from the left atrium to the left ventricle due to a structurally narrowed valve.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include exertional dyspnea, fatigue, palpitations, or signs of left atrial enlargement. Diagnosis is usually confirmed by imaging, especially echocardiography.
When to use this code
Use I34.2 when the provider documents nonrheumatic mitral stenosis, mitral valve narrowing, or mitral stenosis not linked to rheumatic disease. Apply it when the record clearly distinguishes the condition from rheumatic mitral valve disease. Check documentation if the cause is unclear.
Do not use for
Do not use this code for rheumatic mitral stenosis or for mitral regurgitation. If the note only states “mitral valve disease” without specifying stenosis, you need more detail.
Coding tip
Code the documented valve disorder exactly as stated and verify that rheumatic disease is not the cause.