ICD-10 Code I05.9 – Rheumatic mitral valve disease, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I05.9 – Rheumatic mitral valve disease, unspecified
What it is
I05.9 identifies rheumatic disease of the mitral valve when the record does not specify the exact valve lesion. Use it for chronic valve damage linked to prior rheumatic fever.
Clinical signs
Findings may include a heart murmur, dyspnea, palpitations, fatigue, or signs of mitral valve dysfunction. Clinical features vary; refer to documentation.
When to use this code
Use this code when the clinician documents rheumatic mitral valve disease but does not name stenosis, insufficiency, or another specific lesion. It also fits when the chart confirms rheumatic origin but the subtype is unclear. Check documentation if the record suggests a more specific rheumatic mitral diagnosis.
Do not use for
Do not use I05.9 when the record specifies rheumatic mitral stenosis, rheumatic mitral insufficiency, or a nonrheumatic mitral valve disorder. If the documentation is incomplete, check documentation.
Coding tip
Code the most specific rheumatic mitral valve diagnosis available; if the subtype is stated, do not default to unspecified.