Can I Change Medigap Policies? 
You can change Medigap plans any time you wish , as long as you can pass medical underwriting . When you are initially eligible for Medicare , and your Part A and Part B begins , you have 6 months to sign up for a Medigap plan without evidence of insurability . You can change as many times as you want during that 6 month period . After that time evidence of insurability is required in most states . 