1939-1949 - Multiple additions to the hospital provided service space for medical, pediatric, obstetrical and surgical patients. The new building featured air conditioning and added 61 beds, bringing the total beds to 278
1952 - MIHS has one of the oldest and largest physician training programs in Arizona. The American Medical Association approved teaching hospital status for MIHS in 1952 and the medical education program began the following academic year.
Betsey Bayless was appointed President Emeritus of the Maricopa Integrated Health System in September 2013 by the organization’s five member Governing Board after leading Arizona’s only public hospital system for eight years as President and Chief Executive Officer.