ICD-10 Code I23.4 – Rupture of chordae tendineae as current complication following acute myocardial infarction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I23.4 – Rupture of chordae tendineae as current complication following acute myocardial infarction
What it is
This code identifies a rupture of the mitral or tricuspid chordae tendineae that occurs as a current complication after an acute myocardial infarction. Use it when documentation links the structural valve support injury to the recent infarct.
Clinical signs
Clinical features vary; refer to documentation. You may see new or worsening murmur, acute valvular regurgitation, heart failure symptoms, or hemodynamic instability after MI, with imaging or surgical findings confirming chordal rupture.
When to use this code
Use this code when the record clearly states chordae tendineae rupture is a current post-MI complication. It is appropriate for inpatient and follow-up documentation when the condition remains active and is being evaluated, monitored, or treated.
Code from the medical record, not assumption. If the note only mentions prior MI without a current complication, or the valve injury is from another cause, check documentation before assigning I23.4.
Do not use for
Do not use this code for isolated valvular disease, non-traumatic chordal rupture unrelated to infarction, or history of MI without a current complication. Check documentation if the cause or timing is unclear.
Coding tip
Link I23.4 only when the provider documents the rupture as a current complication of acute MI.