If there is a problem with the plan that affects me, Medicare takes an action call a (Sanction). You can switch to another plan other than your Medicare Advantage Plan as well as your Medicare Prescription Drug Plan. As to when you can switch, this is only determined by Medicare. This is done base on case by case situations.
If your plans contract ends and is terminated, you can switch to another plan 2 months before and one entire month after the end of your contract.
If any of your plans Medicare contracts are not renewed, as Medicare Advantage Plans, Cost Plans, or Prescription Drug Plans you can join a different Medicare Prescription Drug Plan or Medicare Advantage Plan December 8 through the last day in February.