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The annual Medicare open enrollment period for the roughly 64 million Americans enrolled in the program begins Saturday. The usual barrage of advertising heralded the arrival of this nearly two-month stretch, which runs every year from Oct. 15 through Dec. 7. Any coverage changes made during this period will go into effect Jan. 1, 2023.

During the annual open enrollment period participants enrolled in traditional Medicare can switch to a Medicare Advantage plan, and Advantage members can switch to a different plan or back to original Medicare.

Surveys show that only about three in 10 people switch plans during the open enrollment period. But just assuming you should stick with your current plan could prove costly, since benefits can and do change every year, particularly for people enrolled in a Medicare Advantage plan.

When you receive the annual “notice of change” for your plan in the mail in the fall, you should pay attention, says Lori Gross, lead financial advisor at Outlook Financial Center.

“One thing I remind my clientele is to make sure their doctor is still on [their plan], and that all their drugs are still covered,” she says. Medicare’s Plan Finder tool lets you compare options and their respective costs. “The pharmaceutical industry changes every year, and pricing changes. They need to verify that everything’s still covered,” Gross says.