ICD-10 Code I34.9 – Nonrheumatic mitral valve disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I34.9 – Nonrheumatic mitral valve disorder, unspecified
What it is
I34.9 identifies a nonrheumatic mitral valve disorder when the exact problem is not specified. Use it for mitral valve disease not caused by rheumatic fever and without a more precise diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Common references include a mitral valve abnormality noted on exam or imaging, such as regurgitation, prolapse, or other structural change, when the record does not name a specific subtype.
When to use this code
Use this code when the provider documents a nonrheumatic mitral valve disorder but does not specify whether it is prolapse, insufficiency, stenosis, or another defined condition. It also fits when the record confirms mitral valve disease and no more detailed term is available. Check documentation before choosing this unspecified code.
Do not use for
Do not use I34.9 if the chart identifies a more specific nonrheumatic mitral valve condition. Also avoid it for rheumatic mitral valve disease or when the documentation only mentions a murmur without a diagnosed valve disorder.
Coding tip
If the note is vague, query for the exact mitral valve diagnosis before defaulting to I34.9.