Obstructive hypertrophic cardiomyopathy

This code represents a genetic heart condition characterized by abnormal thickening of the heart muscle (myocardium), particularly the septum, which obstructs blood flow from the left ventricle to the aorta. This thickening can lead to symptoms such as shortness of breath, chest pain, and syncope due to impaired cardiac output and increased left ventricular outflow tract (LVOT) pressure gradient.

Use this code for patients diagnosed with hypertrophic cardiomyopathy where there is documented evidence of dynamic or fixed obstruction to the left ventricular outflow tract. This diagnosis is typically confirmed by echocardiography demonstrating septal hypertrophy and a significant LVOT pressure gradient, often accompanied by systolic anterior motion (SAM) of the mitral valve.

• Differentiate from non-obstructive hypertrophic cardiomyopathy (I42.2), which lacks the LVOT obstruction.
• Ensure documentation clearly specifies "obstructive" to support this specific code.
• Consider additional codes for associated conditions like heart failure (I50.-) or arrhythmias (I47.-, I48.-) if documented.