ICD-10 Code I34.81 – Nonrheumatic mitral (valve) annulus calcification (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I34.81 – Nonrheumatic mitral (valve) annulus calcification
What it is
Nonrheumatic mitral annulus calcification is calcium buildup in the fibrous ring supporting the mitral valve. It is not caused by rheumatic heart disease and may be an incidental imaging finding.
Clinical signs
Clinical features vary; refer to documentation. It may be seen on echocardiography or other cardiac imaging, sometimes with a systolic murmur or associated mitral valve dysfunction.
When to use this code
Use I34.81 when the provider documents nonrheumatic calcification of the mitral annulus or mitral valve annulus. Code it when the condition is confirmed on imaging or listed as an active diagnosis in the record. If the note only says “mitral valve calcification” without annular specificity, check documentation.
Do not use for
Do not use this code for rheumatic mitral valve disease or for calcification involving a different cardiac structure. If the record is nonspecific or the diagnosis is uncertain, check documentation.
Coding tip
Confirm that “annulus” or “annular” is documented before assigning I34.81.