Medical Group - Diabetes Center Diabetes Center 10101 SE Main St., Suite 2014 Portland, Oregon 97216 Fax: 503-261-5924 For Appointments call 503-261-6003 Specialty Diabetes Care Providers Leonard R. Bertheau, 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.