Admin March 6, 2013 Post a Comment mutual of omaha 2013 illinois mediare supplement rates, mutual of omaha 2013 medicare supplement rate increase illinois Mutual of Omaha – 2013 Illinois Medicare Supplement Plan Rate Increases Mutual of Omaha has released their 2013 Illinois medicare supplement rate increases on both new and current members effective April 1, 2013. Plans A and Plan F: 9% increase Plan G: 5% increase