ICD-10 Code I23.5 – Rupture of papillary muscle as current complication following acute myocardial infarction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I23.5 – Rupture of papillary muscle as current complication following acute myocardial infarction
What it is
This code identifies papillary muscle rupture that occurs as an active complication after an acute myocardial infarction. It reflects a serious mechanical problem of the mitral valve apparatus caused by recent heart muscle damage.
Clinical signs
Clinical features may include sudden worsening shortness of breath, new or worsening heart failure, and a new harsh murmur. Check documentation for echocardiographic or surgical confirmation; clinical features vary.
When to use this code
Use I23.5 when the provider documents papillary muscle rupture as a current complication of a recent acute myocardial infarction. It is appropriate when the rupture is part of the active post-MI course and not a remote history. Do not infer this from general valve disease alone.
Do not use for
Do not use this code for papillary muscle dysfunction without rupture, or for mitral regurgitation from another cause. If the record does not link the rupture to a current acute MI, check documentation.
Coding tip
Link the complication explicitly to the acute myocardial infarction in the record before assigning I23.5.