Banner Boswell Medical Center (Sun City, Ariz.). In 2015, Banner Boswell Medical Center was named a Truven 100 Top Hospital and an iVantage HealthStrong Top Hospital. The 501-bed hospital located approximately 25 miles northwest of Phoenix was also recognized by Healthgrades with a Patient Safety Excellence Award and a Stroke Care Excellence Award in 2015. U.S. News & World Report ranked Banner Boswell Medical Center among the top 15 hospitals in the Phoenix metropolitan area an Arizona in its 2014-15 rankings.