Patient Portal Grand River Medical Group Dubuque, IA. Grandrivermedicalgroup.com DA: 30 PA: 34 MOZ Rank: 71. To unlock your account call Grand River Medical Group Patient Portal Support Line at (563) 589-4080, Option 1, from 8:00 AM to 5:00 PM Monday - Friday excluding Holidays. A staff member will assist you with unlocking your account..