ICD-10 Code I51.1 – Rupture of chordae tendineae, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I51.1 – Rupture of chordae tendineae, not elsewhere classified
What it is
This code identifies rupture of the chordae tendineae, the fibrous cords that support heart valve leaflets. It indicates a structural tear not classified elsewhere and often affects valve function.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a new or changed cardiac murmur, signs of valvular regurgitation, or symptoms of acute heart failure when the rupture is significant.
When to use this code
Use I51.1 when the record specifically documents rupture of the chordae tendineae and does not assign the condition to a more specific diagnosis. It may appear after imaging, surgical findings, or cardiology assessment. Code only when the documentation supports the structural rupture.
Do not use for
Do not use this code for generic valvular disease, papillary muscle rupture, or chordal abnormalities without documented rupture. Check documentation if the record names a different valve lesion or a more specific etiology.
Coding tip
Verify the exact anatomic structure and whether the rupture is documented as the primary diagnosis before assigning I51.1.