For 2019 coverage, open enrollment will run from October 15, 2018, to December 7, 2018. During the annual enrollment period (AEP) you can make changes to various aspects of your coverage. You can switch from Original Medicare to MedicareAdvantage, or vice versa.
Choosing a Part D Drug Plan:
To get Medicare drug coverage, you must sign up for one of the private drug plans approved by Medicare. You have many to choose from — all with different costs and benefits — wherever you live.
In most cases, the plan you choose will be the one you have to stay in for the entire calendar year (or the rest of the year if you’re new to Medicare and joining a plan partway through the year). So it’s wise to compare plans carefully to find the one that best meets your needs. Even if you’re already in Part D, making a careful comparison between the plan you have now and alternatives available to you for next year is the only way to ensure that you continue to receive the best deal for you.