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Medicare’s open enrollment period runs from October 15 to December 7, but 7 in 10 Medicare beneficiaries say they don’t compare Medicare plans during this period, according to a 2021 analysis by KFF, a health policy nonprofit.

That’s not great, since Medicare Advantage plans — which operate much like the private insurance you may have had through an employer — change from year to year.

One of your doctors may have fallen out of network, or your prescription drug prices may have gone up. And people with Original Medicare should compare their Part D prescription drug coverage.

Here’s how to approach switching Medicare plans:

Take advantage of enrollment periods

If you have a Medicare plan, Medicare open enrollment is your opportunity to change coverage. You can switch from Original Medicare to Medicare Advantage, or vice versa, or enroll in or change Medicare Part D prescription drug plans.

If you have Medicare Advantage, you can also use Medicare Advantage open enrollment from January 1 to March 31 each year to switch plans or go back to Original Medicare and sign up for a Medicare Part D drug plan.

Review prescription drug plans

If you’re on any prescription medications, it’s important to understand how your current plan will cover them in 2023 and whether another plan might be more affordable.

“It can be as simple as putting your drugs into Medicare.gov,” said Scott Maibor, a Medicare advisor based in Boston. The website will display all the drug plans available to you and their costs.

Part D prescription drug plans can change each year. You may find that one of your prescriptions will cost more in 2023, or that your plan will stop covering it. Or you may have started a new medication and you can find a plan that charges you less for it.

And don’t forget to browse your drug plan’s preferred pharmacies. It’s not just a matter of cost. Their location and convenience may also be important to you.

Think hard before giving up your Medigap plan

You’re first eligible for a Medicare Supplement Insurance, or Medigap, plan once you’re 65 or older and you sign up for Medicare Part B.

The six-month Medigap open enrollment period happens only once, and during it you can buy any policy you want, regardless of your health. After that, you may not be able to get a Medigap plan — or it might cost more.

Medigap pays many of the out-of-pocket costs of Original Medicare. If you have a serious or chronic health condition, that can lead to significant cost savings.

Some people switch to Medicare Advantage plans (which are basically HMOs that combine Medicare Parts A, B and usually D) during open enrollment, not realizing they might not be able to switch back to a Medigap plan later if they want to return to original Medicare.

“Our clients are sitting at home, they’re seeing these commercials on television talking about the free gym membership, zero premiums, and they go ahead and make changes on their own,” said Emily Gang, owner of The Medicare Coach. “They realize early in the year that they made a mistake and can’t go back.”

Complete the process

To sign up for a new plan, you’ll need your Medicare number and the date your Part A and/or Part B coverage started. (Look on your Medicare card.)

You may be able to enroll online, but you might also have to make a call or two:

• If you’re moving from one Medicare Advantage plan to another, you’ll be disenrolled from your previous plan automatically once your new coverage kicks in.
• If you’re switching from Medicare Advantage to Original Medicare, call 1-800-MEDICARE to make the change or call your plan provider to disenroll. Don’t forget to sign up for prescription drug coverage (Part D) to avoid paying a penalty.
• If you’re switching from Original Medicare to Medicare Advantage, your new plan will transfer your benefits from Medicare.
• If you’re staying with your current plan, do nothing. Your coverage will renew automatically.

 —AP/NerdWallet