ICD-10 Code I34.8 – Other nonrheumatic mitral valve disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I34.8 – Other nonrheumatic mitral valve disorders
What it is
This code identifies mitral valve disorders that are not caused by rheumatic heart disease and do not fit a more specific mitral valve diagnosis. Use it for documented nonrheumatic mitral valve abnormalities when the record does not name a different code.
Clinical signs
Clinical features vary; refer to documentation. Patients may have a murmur, echocardiographic mitral valve abnormality, or symptoms related to mitral valve dysfunction such as dyspnea or palpitations.
When to use this code
Use I34.8 when the provider documents an other specified nonrheumatic mitral valve disorder and no more specific mitral valve code applies. It can support coding when imaging or cardiology notes confirm a structural mitral valve problem, but the exact subtype is not named. Check documentation if the etiology is unclear.
Do not use for
Do not use this code for rheumatic mitral valve disease or for clearly named mitral conditions that have their own ICD-10 code, such as prolapse or stenosis. If the record specifies a different disorder, code that diagnosis instead.
Coding tip
Verify that the chart says nonrheumatic and “other” or unspecified before assigning I34.8.