Medicare Supplements or Medigap plans are guaranteed issue during your open enrollment period.  This begins the first month you have Medicare Part B and are 65 or older and it lasts six months.  What this means is during this six-month period, you cannot be turned down or be given a waiting period for any pre-existing conditions. Pre-existing condition is a health condition that existed before the start of a policy (i.e., diabetes, heart disease, cancer, etc.).  
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If you are trying to get out of a Medicare Advantage Plan and enroll back into Original Medicare you can only do that during the annual AEP which is October 15th through December 7th. 

​Health care is one of the biggest expenses most seniors have during retirement, so it’s important to understand the costs associated with health care. Budgeting for health care should be one of your top priorities and every senior should have a solid understanding of Medicare costs and benefits. Seniors should factor in Medicare costs when planning for retirement, and choose the Medicare plan that makes the most financial sense for you.