Congenital subaortic stenosis

This code identifies a congenital heart defect characterized by a narrowing of the left ventricular outflow tract, specifically below the aortic valve. This obstruction impedes blood flow from the left ventricle into the aorta, increasing the workload on the heart. The severity can range from mild to severe, impacting cardiac function.

Apply this code when documentation clearly indicates a diagnosis of subaortic stenosis present at birth. This diagnosis is typically confirmed through echocardiography or other cardiac imaging studies. Use this code for initial diagnoses, follow-up care, and when managing complications directly related to the congenital subaortic stenosis.

• Differentiate from acquired subaortic stenosis, which would be coded differently.
• Do not confuse with aortic valve stenosis (Q23.0) or supravalvular aortic stenosis (Q25.3).
• Always review imaging reports and cardiologist notes for precise anatomical location and congenital origin.