Rheumatic mitral stenosis

This code represents a narrowing of the mitral valve orifice caused by rheumatic fever. This stenosis obstructs blood flow from the left atrium to the left ventricle, leading to increased pressure in the left atrium and pulmonary circulation. It is a chronic sequela of acute rheumatic fever.

Use this code when documentation explicitly states "rheumatic mitral stenosis" or indicates mitral valve narrowing with a clear history or evidence of rheumatic heart disease. Supporting documentation includes echocardiogram reports detailing mitral valve area and pressure gradients, and physician notes confirming the rheumatic etiology.

• Do not use this code for non-rheumatic causes of mitral stenosis; differentiate based on documented etiology.
• Always look for documentation of any associated mitral regurgitation (I05.1) or other rheumatic heart conditions for potential co-coding.
• Ensure the documentation clearly links the mitral stenosis to a rheumatic origin; otherwise, a non-rheumatic mitral stenosis code (e.g., I34.2) may be more appropriate.