Rupture of chordae tendineae, not elsewhere classified

This code signifies a tear or breakage of the chordae tendineae, the fibrous cords that anchor the heart valves (most commonly the mitral valve) to the papillary muscles. This rupture can lead to severe valvular regurgitation, particularly mitral regurgitation, due to the valve's inability to close properly.

Use this code when documentation explicitly states a rupture of the chordae tendineae that is not attributed to a recent acute myocardial infarction. This condition is often identified during echocardiography or cardiac catheterization, and the physician's notes should confirm the diagnosis and absence of an MI as the cause.

• Carefully review documentation to ensure the rupture is not a complication of a recent acute myocardial infarction; if it is, use I23.4.
• This code is typically a principal diagnosis when the rupture is the primary reason for admission or encounter.
• Look for associated conditions like mitral regurgitation (I34.0) to code concurrently, as the rupture often causes or exacerbates valvular insufficiency.