I would talk to him/his staff and see what accommodations can be made and talk to your insurance, see if they will still pay (that your doctor does not deal with the insurance company anymore does not mean that your insurance will not deal with the doctor! You may just have to do the paperwork yourself is all). I think you have to talk to him. I do not think he knows off the top of his head that "you" have that insurance and, as you point out, the practice may have quit taking it, not him, personally. Doctors' are notoriously unfamiliar with insurance issues, they have staff that are in charge of that, they have to work hard at keeping up with being a doctor.