ICD-10 Code I05 – Rheumatic mitral valve diseases (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I05 – Rheumatic mitral valve diseases
What it is
I05 identifies rheumatic disease affecting the mitral valve. Use it when documentation shows a rheumatic cause of mitral valve damage, not a nonrheumatic valve disorder.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a heart murmur, signs of mitral stenosis or regurgitation, and evidence of prior rheumatic heart disease.
When to use this code
Use I05 when the provider documents rheumatic mitral valve disease, including rheumatic mitral stenosis, insufficiency, or mixed disease. It also fits when the record links mitral valve dysfunction to rheumatic fever or rheumatic heart disease.
If the note only says “mitral valve disease” without rheumatic origin, check documentation before coding. Confirm the rheumatic etiology in the assessment, problem list, or cardiology report.
Do not use for
Do not use I05 for nonrheumatic mitral valve disorders or unspecified valve disease without rheumatic documentation. Check documentation if the cause is degenerative, congenital, or unclear.
Coding tip
Code the rheumatic cause only when it is clearly documented; otherwise, query or select the more specific nonrheumatic diagnosis.