The Wisconsin Medical Society is the largest association of medical doctors in the state with more than 12,000 members dedicated to the best interests of their patients. CONTACT INFO: Wisconsin Medical Society 330 E. Lakeside Street PO Box 1109 Madison, WI 53701-1109 Main Phone: 866.442.3800 (toll-free) Main Fax: 608.442.3802 Click here to contact us. Department Direct Lines: Membership: 800.762.8975 Insurance: 866.442.3810 Seminars: 866.442.3820 Government Relations: 866.442.3800