When you are incarcerated, you should stop paying premiums for your Medicare Advantage Plan or stand-alone Part D prescription drug plan. When you are in jail or prison, you are no longer eligible for these plans and your coverage must end. When you are released, you have a Special Enrollment Period (SEP) to join a Part D prescription drug plan or a Medicare Advantage Plan. Your SEP begins the month before you are released and ends two months after you are no longer in custody. You should choose a stand-alone Part D or Medicare Advantage Plan that works best for your drug and health care needs. You must inform the Part D plan or Medicare Advantage Plan you choose of your address in the community, so they can confirm you are eligible to enroll in that plan.