Nonrheumatic mitral (valve) stenosis

This code represents a narrowing of the mitral valve opening that is not caused by rheumatic fever. This stenosis impedes blood flow from the left atrium to the left ventricle, leading to increased pressure in the left atrium and pulmonary circulation. It can be congenital or acquired due to degenerative changes, calcification, or other non-rheumatic etiologies.

Apply this code when documentation explicitly states "nonrheumatic mitral stenosis" or describes mitral valve narrowing attributed to causes other than rheumatic disease. This includes conditions like mitral annular calcification causing obstruction, congenital mitral stenosis, or degenerative mitral valve disease leading to significant narrowing.

• Differentiate carefully from rheumatic mitral stenosis (I05.0) based on documented etiology.
• Look for specific physician documentation ruling out a rheumatic origin.
• Code any associated heart failure or other complications separately.