Next time, tell them the doctor can wait for a table. While the doctor is waiting, he can fill out a 'brief' questionnaire consisting of 15 pages asking how his food was prepared historically and document how he chews his nourishment. Afterwards, inform him that the questionnaire will not be used, he owes $200 for a 10 minute appointment (regardless if ate), and that your professional culinary opinion is the only one that matters.