AHA Coding Clinic® for ICD-9 - 2007 Issue 4; VOLUMES 1 AND 2 NEW/REVISED CODES

Chronic Total Occlusion of Coronary Artery

Effective October 1, 2007, code 414.2, Chronic total occlusion of coronary artery, has been created to capture this diagnosis. A chronic total occlusion involves complete blockage of a coronary artery that has been present for an extended period of time (e.g., months or years). The chronic total occlusion develops when plaque accumulates in the artery, leading to a substantial reduction in blood flow and the development of bypass collateral blood flow. Although well-developed collaterals do not completely compensate for diminished blood flow, collaterals help to preserve the viability of the myocardium and prevent resting ischemia. Patients with...

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