888-305-2741 for SIU Medicine (SIUSIU3) 888-305-2740 for SIU Center for Family Medicine (SIUSIU5) Financial assistance programs are also available for those who qualify. Payment Address and Inquiries. Patient Business Services (Billing) 201 East Madison Street PO Box 19651 Springfield, IL 62794-9651. Patient Business Services (Billing) 217-545-4966.