Nonrheumatic mitral (valve) annulus calcification

This code represents the hardening and stiffening of the fibrous ring that supports the mitral valve in the heart, not caused by rheumatic fever. This calcification can impair the mitral valve's function, potentially leading to mitral regurgitation or stenosis.

Apply this code when documentation explicitly states "nonrheumatic mitral annulus calcification" or "mitral valve annulus calcification" without evidence of rheumatic origin. This diagnosis is typically made via echocardiography or other imaging studies.

• Differentiate from rheumatic mitral valve conditions, which have distinct ICD-10-CM codes.
• Do not assign if the calcification is a secondary finding to another specified mitral valve disorder, unless it is clinically significant and independently documented.
• Ensure the documentation specifies "nonrheumatic" or lacks any indication of rheumatic etiology.