Marietta Rheumatology Associatese. Mariettarheumatology.com Patient Portal; our Location. Address Marietta Rheumatology Associates 670 North Ave Suite 100 Marietta, GA 30060 Phone/Email Main (770) 590-8328 Fax (770) 590-8231 Email: [email protected] Office Hours Monday through Thursday 8am- 4pm Friday (Closed) Map..