ICD-10 Code I51.2 – Rupture of papillary muscle, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I51.2 – Rupture of papillary muscle, not elsewhere classified
What it is
I51.2 identifies rupture of a papillary muscle, a rare structural heart injury that disrupts mitral valve function. It usually reflects an acute mechanical complication of underlying cardiac disease or trauma.
Clinical signs
Clinical features vary; refer to documentation. Common findings include abrupt shortness of breath, pulmonary edema, new or worsening heart failure, and a new murmur consistent with acute mitral regurgitation.
When to use this code
Use I51.2 when the record clearly documents papillary muscle rupture as the diagnosed condition. This code fits inpatient, emergency, or cardiology documentation when the rupture is the focus of care or a confirmed complication. If the note only suggests suspected rupture, code the documented uncertainty instead.
Do not use for
Do not use this code for general valve disease, papillary muscle dysfunction, or mitral regurgitation without rupture. Check documentation if the record describes another cardiac structural defect.
Coding tip
Assign I51.2 only when rupture is explicitly stated; do not infer it from symptoms or echocardiogram findings alone.