Multiple realities
(covers information from several alternate timelines)
(covers information from several alternate timelines)
An attending physician was the doctor responsible for a specific patient's care.
In 2258 of the alternate reality, Leonard McCoy was James T. Kirk's attending physician when the cadet was suffering from the side effects of the Melvaran mud flea vaccine, a fact which gave him say in how and where Kirk was treated, as per the Starfleet medical code. (Star Trek)
In 2377, Kadan was the attending physician for all 64 patients whose medical records Kathryn Janeway looked up. (VOY: "Workforce")