You do not need any modifier, the codes don't bundle.
Hope that helps,
F Tessa Bartels, CPC, CEMC
I also agree, when a Colonoscopy and an EGD are done on the same day, no modifier is required because they do not bundle. However, If there were two procedures done on the either the colonoscopy or EGD on the same day, you would need the -59: for example, 45380-59, 45385.