Medicare open enrollment is happening now. Here's what to know.

Ready, set, go.

The 2025 annual Medicare enrollment period runs from Oct. 15 to Dec. 7. During this time, those who are enrolled can make changes to their coverage, which goes into effect on Jan. 1.

It’s a big deal this year because some significant changes will kick in starting in 2025. Last month, you received your Annual Notice of Change (ANOC) letter laying out upcoming shifts in Medicare Part D prescription drug coverage and costs that will be effective in January. If you’re enrolled in Medicare Advantage, your letter spelled out the upcoming changes to your plan.

My educated guess is that you set it aside, or even tossed it.

Find it.

“It’s particularly important to review your plan this year because of the changes that we're seeing both in terms of plan availability and premiums,” Juliette Cubanski, deputy director of the program on Medicare policy at KFF, told Yahoo Finance.

“I know it can be difficult,” Cubanski said. “There are a lot of plans out there, and especially if you take a lot of medications, doing that sort of comparison can seem pretty overwhelming.”

You may think that the plans are pretty much the same, so you’ll stick with what you’ve got. But push yourself to do this exercise.

“We’re seeing some changes not just in terms of premiums, but in terms of cost-sharing, deductibles, and aspects of coverage that could affect both what people pay, but also their ability to access the medications that they need,” she said.

What’s changing in Medicare drug costs and coverage in 2025

1. A new drug cost cap.

In 2025, everyone enrolled in Part D prescription drug plans will have their annual out-of-pocket drug costs capped at $2,000 for co-pays or coinsurance for the prescription drugs their plan covers — a provision in the 2022 Inflation Reduction Act. That’s down from $3,500 this year.

In 2025, Part D plans can have a deductible of up to $590. Then you pay co-payments for your medications until your total out-of-pocket costs reach $2,000.

AARP estimates that 3.2 million Medicare enrollees will reach the $2,000 cap in 2025. By 2029, this number will increase to 4.1 million, or about 10%, of enrollees. It will not apply to Part B prescriptions administered by doctors or any medications not covered by your Part D plan.

According to the analysis, people who reach the cap will save an average of $1,500 in 2025, and an average of 420,000 enrollees will save $3,000 or more between 2025 and 2029.

That’s fantastic in theory.

“This is going to lead to some really significant savings for people who've really been struggling with prescription drug prices,” Leigh Purvis, AARP’s prescription drug policy expert, previously told Yahoo Finance.