ICD-10 Code I05.0 – Rheumatic mitral stenosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I05.0 – Rheumatic mitral stenosis
What it is
I05.0 identifies narrowing of the mitral valve caused by rheumatic heart disease. Use it when documentation specifically links mitral stenosis to a rheumatic cause.
Clinical signs
Typical findings include reduced blood flow across the mitral valve, exertional shortness of breath, and signs of left atrial enlargement. Clinical features vary; refer to documentation.
When to use this code
Use I05.0 when the provider documents rheumatic mitral stenosis, rheumatic mitral valve narrowing, or a rheumatic valvular lesion affecting the mitral valve. It may appear in chronic valve disease, follow-up cardiology notes, or echocardiogram-based assessments. Check documentation if the cause is not clearly stated.
Do not use for
Do not use this code for nonrheumatic mitral stenosis or isolated mitral regurgitation. If the record does not confirm a rheumatic origin, check documentation.
Coding tip
Code the rheumatic cause only when it is explicitly documented, because mitral stenosis alone does not prove I05.0.