CCATT course is two weeks long, at Brooks City Base in San Antonio, TX. Mostly classroom, with a couple of hours in the back of a plane. Mostly going over how to do what you do in a hospital in the air. Two days of altitude physiology to learn what happens to the body at altitude, as well as a chamber ride so you know how your body responds to hypoxemia.
Most imporatant part of the class was equipment familiarization, learning how to use the equipment the team gets, as well as how to package and prepare patients for transport.
As far as medical training, it isn't there.