A modifier shouldn't be needed on the 93543 or the 93545.
I have a question about your second case, though. Was the 7/20 intervention a planned intervention? Did the doctor plan on bringing the patient back for a staged intervention of the -LC? If so, you can't bill for the coronary angiography separately. You could only bill out the 92980.LC on that day then.
If the coronary angiography was purely diagnostic then your codes would be fine and no extra modifier should be needed on the 93508-26 or 93545.
Hope this helps. Jessica
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