Emergency Medicine - St. Mary Medical Center - Long Beach is an emergency room that offers many services, including emergency medicine, a STEMI heart attack center, and a level II trauma center. Visit Emergency Medicine - St. Mary Medical Center - Long Beach located at 1050 Linden Ave, Long Beach, CA. This Long Beach emergency room is one of the best in California. As part of the Dignity Health network, Emergency Medicine - St. Mary Medical Center - Long Beach is dedicated to delivering high quality, compassionate care and access to Long Beach and nearby communities.