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I am trying to learn how to code these. I need help. What is the difference between the two? And anything else you can tell me that is helpful. Cta of heart - aorta etc.
A CT is without contrast with quantitive eval of coronary calcium (75571)
A CTA is not just the heart but the coronary arteries and bypass grafts (if present) and with contrast, including 3D image postprocessing (75574)