Most people can only switch their Part D plan during Medicare's Open Enrollment period, which runs from October 15 to December 7.
Outside of this period, it is unlikely that you will be able to switch plans.
However, you may qualify for a special enrollment period to change your Part D plan in certain situations at other times during the year.
Additionally, you can switch into a five-star Part D or Medicare Advantage plan once any time of the year, except for the first week in December.
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In most cases, you can only make changes to your Medicare Part D prescription drug coverage during Fall Open Enrollment (October 15 through December 7). Your new coverage begins January 1 of the following year.
Changing Part D plans - Medicare Interactive
No, you can't switch Medicare Part D plans anytime, but you can make changes during Part D and Medicare Advantage open enrollments. During the open enrollment period, you can sign up for a Part D plan or switch from one Part D plan to another during the open enrollment period, and you may qualify for a special enrollment period to change your Part D plan in certain situations at other times during the year. You can also switch into a five-star Part D or Medicare Advantage plan once any time of the year, except for the first week in December.
Can I Change Medicare Part D Plans At Any Time? - AARP
Find out when you can sign up for or change your Medicare coverage. This includes your Medicare Advantage Plan ( Part C) or Medicare drug coverage ( Part D ). Special circumstances (Special…
Sign up/change plans | Medicare
Application Guidance. This page provides important information on the application process for Medicare prescription drug plans (PDPs, MA-PDs, Cost, EGWP, Direct, and PACE). Please use the Medicare Advantage link in…
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