AdventHealth Medical Group Primary Care at Shawnee Mission. 7450 Kessler Street, Suite 300 Shawnee Mission 66204 KS. Providers at this Location. Lynda Brumley, MD. AdventHealth Medical Group Primary Care at Shawnee Mission. Primary Care, Internal Medicine, Geriatric Medicine. Matthew Buss, ABFM, MD.About‧Find a Doctor‧Resources.