37226 includes imaging. If a true diagnostic lower extremity angiogram was performed prior to the stent placement, then you need to add modifier 59 to 75710 or 75716. Catheterizations for the stent is also included in 37226. Catheterizations for diagnostic studies in vessels other than the treated extremity can be coded with -59 modifier. I note however that you are probably coding catheterizations incorrectly - or your doctor is doing a lot of separate accesses. In the first one, your codes indicate that 3 separate accesses were performed - 36140, 36247, and 37226 (since catheterization is included). The second one has several also. I suggest that you review the rules for coding catheterizations as it would be unusual to have both 36140 and another catheterization code.