Medical Group - Gladstone Medical Group - Gladstone 1105 Portland Ave, Suite 2 Gladstone, Oregon 97027 For Appointments call 503-655-2404 Hours 8 a.m. to 5 p.m., Monday-Thursday 8 a.m. to 4 p.m., Friday Specialty Family Medicine Physicians Gerald M. King, DO   View Adventist Health Medical Group in a larger map Health Plans Accepted Most major health plans are accepted. Please call to verify if a particular insurance plan is accepted.