Medicare Supplement Plans Wisconsin - Wisconsin Medicare Plans. Wisconsin Medicare Supplement Plans Find An Affordable Medicare Supplement Plan Medicare supplement plans in Wisconsin are not the same as most of the states that use the lettered plans for Medigap plans. For help navigating the Medicare in Wisconsin and to get the details you need to know, give us a call 920-545-4884, we are a local Independent Medicare Supplement agency and we know Medicare in Wisconsin. Please keep reading for more information on Wisconsin Medicare Supplemental Insurance.