If you can afford it out of pocket, I would go do it and ask to be reimbursed. If it’s the same one you used before and they accepted it. I always do it on my own. I get reimbursed or I don’t. I accept that risk
Sounds to me you go to a clinic what has several different doctors that do physicals? What Ive found is there is only ever one doctor on duty at a time. In either case, if that's what you were asking, simply call the clinic and see what their policies are.
There is no regulations that state you have to use a random doctor .