How to determine global period with 2 procedures/2 different global periods

AHVC

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In reviewing claims where 2 vascular procedures 37468 (global period - 0) and 37766-51 (global period - 90 days) were billed I am trying to determine the global period. There are references made that the primary procedure which in this case would be 37468 because it has the higher RVU in a non-facility setting would drive the determination on global period. Of course, I cannot find anything in writing.

Can anyone point me in the direction of where I would find guidance on how the global period is determined or would it have to be on a case by case determination based on why the patient was being seen - in other words was it related to the 1st procedure or the 2nd...which would be hard because they are both proceduers based on the same diagnosis.
 
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