Do what you gotta do, as I've noticed over the years that some doctors think that they can "walk on water." Well they can't and I'll tell them so if I feel the need. They also think that since they went to medical school their time is "very valuable." And what mine isn't? If a doctor is running late for whatever stupid reason, their patients should be told this up front as soon as they check in with the receptionist. When I was working we had a "starting time" and we were there at that time or there's a good chance we would be "down the road."