the marketplaces are not for people on medicare. and changing medigap plans is not an easy matter. after the initial open enrollment period insurers can deny you. visit the medicare. gov medicare helpful contacts page or call 1-800-medicare (1-800-633-4227) for personalized help comparing supplemental plans. i also had cancer 4 yrs ago and was able to get a supplement through united healthcare. they have different insurances but still accept you if you have had cancer.
i have united healthcare as a supplement for medicare. . i pay $163 a month and wonder if there is a cheaper plan that i can get that is just as good.