Contact Us Our address is: The Endocrine Group 5401 N Portland Suite 310 Oklahoma City Ok 73112 (405) 951-4160 Fax (405) 951-4162 We are located on the 3rd floor of the south Deaconess Medical Office Building. Our office is open 8:00 a.m. to 4:30 p.m. Monday through Friday. Our telephone hours are 9:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:00 p.m. Monday through Friday.