By KATE ASHFORD of NerdWallet

Only 3 in 10 Medicare beneficiaries shop around during open enrollment, according to a 2022 analysis from KFF, a health policy nonprofit __ and only 1 in 10 Medicare Advantage enrollees voluntarily switch plans. But a 2020 analysis of Medicare Advantage plan choices by the National Bureau of Economic Research found that more than half of beneficiaries overspent by more than $1,000 due to the plan they selected.

Here are some practices to avoid as you shop for Medicare Advantage this fall.

1. THINKING MEDICARE ADVANTAGE IS MEDICARE

If you're considering Medicare Advantage, understand that it's not the same thing as government-provided Medicare. It offers the same benefits, but Medicare Advantage is run by private health insurance companies and it operates differently.

"You are essentially taking the Medicare coverage that you've been provided by the government and turning that in," says Melinda Caughill, co-founder and CEO of 65 Incorporated, which offers Medicare guidance.

You can switch back to Original Medicare during each year's open enrollment period, but you may not be able to qualify for an affordable Medicare Supplement Insurance, or Medigap, plan once you're past the one-time Medigap open enrollment period. (Medigap helps with certain out-of-pocket costs not covered by Original Medicare.)

2. ASSUMING YOUR DOCTORS ARE IN NETWORK

Medicare Advantage plans operate within networks of medical providers, and you usually must see in-network doctors for covered care.

"A lot of people don't realize that __ especially those $0-premium plans __ they tend to have fairly confined networks," says Emily Gang, CEO of the Medicare Coach, a site that provides Medicare guidance. "You want to double-check that your doctor is actually an approved provider in that network."

Ask your providers what insurance they'll be accepting in 2024, suggests Sarah Murdoch, director of client services for the Medicare Rights Center, a nonprofit consumer advocacy organization. It's easier than trying to check each plan's network individually.

3. NOT CHECKING YOUR DRUG COVERAGE

Like network providers, drug coverage can also change each year. Your drug plan might cover one of your medications differently in 2024, leaving you with more out-of-pocket costs than you expected.

"If you take even one brand name medication, your need to compare plans is incredibly high," Caughill says. No brand names on your list? Shop around if you take five or more medications in general.

4. BUYING FOR THE DENTAL BENEFITS

Medicare Advantage plans usually include benefits that aren't part of Original Medicare, such as dental, vision or hearing coverage. These extras may be appealing, but don't let them steer your plan choice.

"First of all, it's health insurance __ so how is it going to cover your health care providers and your medications?" says Katy Votava, who holds a doctorate in health economics and nursing and is president and founder of Goodcare, a consulting firm focused on the economics of Medicare. "If you pick (your plan) for a benefit that isn't health insurance, you're often picking wrong. And the dental benefit is pretty limited in all these plans __ it's a couple of cleanings and some bite wings."

5. LOOKING AT THE PREMIUM ONLY

The majority of Medicare Advantage enrollees are in plans with no premium, meaning you pay nothing each month for the plan. "People see that $0 premium and they're like, 'Oh, it's free,'" Gang says.