Chronic total occlusion of coronary artery

This code signifies a complete and persistent blockage of a coronary artery, meaning blood flow is entirely obstructed. This chronic condition typically develops over time due to atherosclerosis and can lead to myocardial ischemia or infarction.

Apply this code when documentation explicitly states a "chronic total occlusion" of a coronary artery. This diagnosis is often supported by angiographic findings, cardiac catheterization reports, or detailed physician notes indicating the long-standing nature and complete obstruction.

• Differentiate from acute or subacute occlusions; this code is specifically for chronic cases.
• Ensure documentation specifies "total" occlusion; partial blockages would be coded differently.
• Consider sequencing with other coronary artery disease codes, especially if an acute event is also present.