Contact Us CHI Memorial Arthritis and Rheumatology Associates CHI Memorial Missionary Ridge Medical Tower 725 Glenwood Drive, Suite E-588 Chattanooga, TN 37404 (423) 362-7990 Office hours: Monday - Thursday: 7:30 a.m. - 4:30 p.m. Friday: 8:00 a.m. - 12:00 p.m.