The only answer that counts is the one from your insurance company - contact them in a form that leaves a written trail of their answer, as it could get expensive if they tell you that you "misunderstood".
With my policy, I pay the same deductibles as if not on medicare, with the employer policy paying on the 20% until what's left over is what I would have paid pre-medicare. I don't know if I would be reimbursed for out of country, as I have no experience with that.
I thought you were some sort of wealthy power broker being able to afford all those international treatments .... I guess that illusion has been dispelled