ER online reservations are available at more than 100 hospitals, including facilities run by Tenet Healthcare Corp. (THC). Reservations and other concierge services, including mobile apps that provide wait times, are intended to make emergency room experiences more palatable. "We value it as a service," Rick Black, a Tenet spokesman, said in an interview. They provide the online ER check-ins at 42 hospitals. It's free for patients at all but a few of those facilities. Reservations, already available in some doctors' offices, are part of an increasing effort by hospitals to shore up revenue by enhancing patient satisfaction.