Banner Lassen Medical CenterThe Banner Lassen Medical Center is a 25-bed community hospital in Susanville, California, United States.WWW swsahs.nsw.gov.au/healths...HistoryThe hospital originally opened in 1883 as Lassen County Hospital. Lutheran Health System assumed management in 1994 and purchased the hospital from St. Mary's Hospital in 1999. Lutheran Health System later merged with Samaritan Health and became Banner Health. The current facility north of town opened in May 2003.