Final answer:
Open office hours typically mean that patients are seen on a first-come, first-served basis, without needing an appointment during the specified hours.
Step-by-step explanation:
When a physician offers open office hours, the best description of when patients are seen by the physician is that patients are seen on a first-come, first-served basis. This approach allows patients to arrive during the scheduled open hours without needing an appointment and be seen in the order that they arrive. Patients are not seen by appointment during these times, do not need to come outside regular business hours, and are not typically seen in the order of their medical conditions unless there is an urgent need.