More than half of people on Medicare pick a Medicare Advantage plan. But what happens if you choose one now and want to switch to a Medigap plan later? The answer surprises a lot of people.
About 54% of people on Medicare are in a Medicare Advantage plan. It’s a popular, often low-cost choice. The trouble comes if you later want to switch from Medicare Advantage to Medigap, the supplement that works with Original Medicare. That move can be harder, and more expensive, than people expect. Here’s why, plus the states where you can switch with no health questions asked.
The catch: switching later can mean medical underwriting
When you first sign up for Medicare at 65, you get a valuable one-time right. For six months, starting the first month you’re 65 and enrolled in Part B, you can buy any Medigap policy with no medical underwriting. That means no health questions, no higher price, and no chance of being turned down. (The familiar “three months before and after” window is the period to sign up for Medicare itself, which is separate from this Medigap window.)
Here’s the catch. If you choose Medicare Advantage at 65 and later want to move to Medigap, most states let the insurer ask about your health. You can be charged more, or turned down entirely.
And here’s why that stings: people rarely switch when they’re healthy. They switch after a diagnosis, when their plan doesn’t cover the care or the doctor they need. That’s the worst possible moment to face underwriting.
One safety net: if you try Medicare Advantage when you first join at 65 and change your mind within 12 months, you have a trial right to switch to Medigap with guaranteed issue. After that first year, the window closes.
Your costs shift from “premium-heavy” to “usage-heavy”
Choosing between Medicare Advantage and Original Medicare plus Medigap isn’t only about the plans. It’s about how you pay.
With Original Medicare and a Medigap plan, your costs are premium-heavy. You pay the Part B premium, a Medigap premium, and a Part D drug premium, but your out-of-pocket costs are steady and predictable.
With Medicare Advantage, the premium is often low, or even $0 beyond Part B, but you pay as you use care, through deductibles, copays, and coinsurance. There’s a yearly safety net: in 2026, the federal cap on in-network medical costs is $9,250. But drugs have a separate cap of $2,100, so your total exposure on some plans can reach about $11,350 in a bad year. For someone on a fixed income, that difference matters.
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Medicare Advantage runs on a network
Most Medicare Advantage plans are HMOs or PPOs, so your care runs through a network. In an HMO, you generally must stay in network except for emergencies. A PPO lets you go outside, but for a higher cost. Many plans also require prior authorization, meaning the insurer has to approve a test or procedure before you get it.
Here’s a number that puts it in perspective: when enrollees appeal a denied Medicare Advantage request, more than 80% of those denials are overturned, according to KFF. That’s a lot of friction that Medigap members don’t deal with.
With Original Medicare and a Medigap plan, you can see almost any doctor in the country who accepts Medicare, which is the vast majority of them. That matters if you travel, split the year between two states, or develop a condition that needs a specialist outside a network.
Your plan can change every year
Medicare Advantage plans are yearly contracts. Each year, the insurer can change the doctors and hospitals in the network, the drugs it covers, and the copays and deductibles. The plan you loved at 65 is not locked in for life.
That isn’t always bad, sometimes coverage improves, but it means you have to review your plan every fall during the annual enrollment period, October 15 to December 7, and switch if it no longer fits. Original Medicare with Medigap is far more consistent, though you do want to watch for premium increases over time.
The risks add up over time
On their own, each of these is manageable. Together, they compound. At 65 you have the widest choice and no health barriers. By 75, your health may have changed, a favorite doctor may have left the network, or you may have moved to an area where your plan’s benefits don’t reach. And if you want to switch then, underwriting may be waiting. Medicare is sometimes a one-year decision, but often it shapes your options for life.
The good news: states that let you switch without underwriting
Some states go beyond the federal rules and protect your right to switch:
- New York and Connecticut require insurers to sell Medigap year-round, with no health questions, regardless of your current plan or health.
- Massachusetts has a guaranteed-issue window each year, February 1 to March 31.
- Maine guarantees access to Medigap Plan A during one designated month each year.
There are also “birthday rule” states, where, around your birthday, you can switch to a Medigap plan with equal or lesser coverage without underwriting. These now include California, Idaho, Illinois, Kentucky, Louisiana, Maryland, Nevada, Oklahoma, and Oregon, with newer additions such as Delaware, Indiana, Utah, Virginia, and Wyoming. The list keeps growing and the rules vary by state, so check your own state’s current rules before you count on it.
When Medicare Advantage is the right call
None of this means Medicare Advantage is the wrong choice. Both camps are legitimate. A Medicare Advantage plan can be a great fit if you want a low monthly premium, you’re comfortable using a network and don’t need national flexibility, and you’re willing to review your coverage every fall. Many of these plans also include extras that Original Medicare and Medigap don’t, like dental, vision, hearing, transportation, meal delivery, and over-the-counter allowances.
The bottom line
The point isn’t that one camp is right. It’s that if you choose Medicare Advantage, you should go in with your eyes open about the switching risk later. Picking the right path, and timing any switch, depends on your health, your doctors, your travel, your budget, and your state’s rules. That’s a lot to weigh, and the cost of guessing wrong can run into the thousands. This is exactly the kind of decision where unbiased, expert help, from someone who can compare every plan in your area at no cost to you, is worth the time.
This is educational information, not personal advice. Medicare rules and dollar figures change every year, and state Medigap rights vary, so confirm your situation at Medicare.gov, with your State Health Insurance Assistance Program (SHIP), or with a licensed advisor before you decide.
Chapter Advisory, LLC (“Chapter”) is a private health insurance agency. In California, Chapter does business as Chapter Insurance Services (Lic. No. 6003691). Chapter is not affiliated with or endorsed by any government entity. While Chapter has a database of every Medicare plan option nationwide and can help you to search among all options, it has contracts with many but not all plans. As a result, Chapter does not offer every plan available in your area. Currently, Chapter represents 50 organizations which offer 18,601 products nationwide. You can contact a licensed Chapter agent to find out the number of products available in your specific area. Please contact Medicare.gov, 1-800-Medicare, or your local State Health Insurance Program (SHIP) to get information on all of your options. Enrollment in a plan may be limited to certain times of the year unless you qualify for a Special Enrollment Period or you are in your Medicare Initial Enrollment Period.
Average potential savings are based on realized premium, co-pay, and out of pocket savings estimates self-reported by consumers that worked with Chapter Advisory LLC to enroll in a Medicare Supplement, Medicare Advantage, and/or Part D Prescription Drug Plan. The average is limited to consumers that chose to self-report. Savings information is subject to periodic updates and corrections. There is no guarantee of savings and any savings may vary by policy type, state, or other factors.
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