About Five Oaks Medical Group. Five Oaks Medical Group is a group practice with 1 location. Currently, Five Oaks Medical Group's 24 physicians cover 27 specialty areas of medicine. Five Oaks Medical Group Office Locations. Five Oaks Medical Group. 2100 W Iowa Ave Chickasha, OK 73018 (405) 224-2100. Monday : 8:00 AM - 5:00 PM:.