Question: A patient shows up at our office complaining of nausea. A gastroenterologist at our branch office across town saw her seven months ago. Do I code her as a new patient? Arizona Subscriber Answer: In this case, the patient is established, even though the encounters took place at separate locations and involved separate physicians. Here's why: Because the physicians are of the same specialty and bill under the same group number, the three-year rule applies. Had the doctors been of different specialties -- or if they billed under different provider numbers -- the second physician may have been able to report the patient as new, as long as the doctor hadn't seen that patient within the previous 36 months.