Patient Portals | Ascension Locations Ascension Medical Group St. John Primary Care Owasso Primary Care/Clinic Address 12455 East 100th Street North #350 Owasso, OK 74055 Phone 918-274-5510 Hours Mon-Fri: 8 a.m.-5 p.m. Appointments 918-274-5510 Schedule Appointment Online Patient Portals Ascension St. John Patient Portals.