Welcome Boater. I've also had surgeries unrelated to my back pain and at a hospital in a different town from where my pain doc is. In each case, I had informed the doc in advance of my CP and provided a list of meds I was on. The hospital managed my post-operative pain very well even though it required "enough fentanyl to drop an elephant" according to one of the nurses.
(She was amazed that I was still coherent!)