How do i contact mmg billing customer service? For Billing & Customer Service Inquiries 1-888-MMG-BILL (1-888-664-2455) To Report a Claim (24 Hour Claims Service) During normal business hours, contact your local agent.How can i contact the memorial medical group for more information? For more information about the physicians of the Memorial Medical Group, call 580.510.7070 or use the following form to send us an email. Information sent via email is not secure or confidential.What do i need to create an mmg account? You MUST have an email address to create an account. Note: if you work for an agency, you must use the email address the Agency Account Administrator used to assign your cases. You will create your own password for your MMG account. It is important you remember your password.