BACK TO PROVIDERS Jason Hatjioannou, M.D. Medical Doctor Internal Medicine Board certified by the American Board of Internal Medicine, Dr. Jason Hatjioannou has been providing healthcare since June of 1984. After attending the University of South Florida, he received his medical degree from American University of the Caribbean. The Detroit, Michigan, native has been with JCIM since August of 1999. Education American University of the Caribbean Johnson City Internal Medicine 301 Med Tech ParkwayJohnson City, TN 37604 Monday – Friday, 8:00am – 4:30pm Schedule an appointment: (423) 794-5520