Medical Group - Mt. Scott We are pleased to introduce our newest location: Adventist Health Medical Group - Mt. Scott.  Welcome to patients of Dr. Katherine Fisher and Peggy Rivers, ANP!  We look forward to serving you.  Adventist Health - Care you can have faith in. Medical Group - Mt. Scott 9200 SE 91st St., Suite 300 Portland, Oregon 97086 Fax: 503-236-3501 For Appointments call 503-236-3443 Hours 8 a.m. to 5 p.m., Monday-Thursday 8 a.m. to 4 p.m., Friday Specialty Internal Medicine Physicians Katherine L. Fisher, DO Peggy Rivers, ANP   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.