Emergency Services, Inc. (ESI) is a physician owned Emergency Medicine Services group formed in 1972 to deliver emergency Physician services to Mount Carmel West Hospital. The Mount Carmel East Hospital campus opened a few years later and is now the busiest adult Emergency Department in the state. The American College of Emergency Physicians recognized ESI in 1998 as one of the oldest continuing emergency Physician groups in the nation. The initial group consisted of a handful of Physicians and one secretary. Now, ESI has grown to include over 50 Physicians and over 30 Extenders. The current practice sites are Mount Carmel West Hospital, Mount Carmel East Hospital, Diley Ridge Medical Center, and Mount Carmel Grove City Hospital.