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When coding and billing for coronary interventions, it is important to know that Medicare only recognizes three major coronary arteries These are the left anterior descending artery, the right coronary artery, and the circumflex artery. Branch vessels are considered an integral part of these three major arteries Interventions in these vessels are reported with the appropriate coronary artery modifiers: LAD (left anterior descending), RCA (right coronary artery), and LC (left circumflex)http://talluritechnologies.com/