Medicare open enrollment starts tomorrow. Between now and December 7, your mailbox, your TV, and probably your phone are going to fill up with cheerful people telling you about $0-premium plans with dental, vision, gym memberships, and grocery cards.
Most of those ads are for Medicare Advantage. And for a lot of people, especially healthy people, Advantage can look like the obvious choice. It’s cheaper up front. It bundles everything together. It feels simple.
What almost nobody tells you is that if you pick Advantage when you first sign up for Medicare and stay in it past your first year, you may have quietly given up your ability to ever get back to the other side. And you probably won’t find that out until the moment you need it most.
I want to walk through how this works, because I think every person approaching 65, and every adult child helping a parent through this, should understand it before they sign anything.
The two roads
When you turn 65, you basically choose between two paths.
Road one is Original Medicare plus a Medigap supplement. Original Medicare lets you see essentially any doctor or hospital in the country that takes Medicare, which is nearly all of them. On its own, though, it leaves you paying 20% of most outpatient costs with no annual cap. That’s why people buy a Medigap policy: it fills in those gaps so a serious illness doesn’t bankrupt you. Add a separate drug plan and you’re set.
Road two is Medicare Advantage. These are private plans that replace Original Medicare. They usually have lower premiums and an out-of-pocket maximum, but they come with networks and prior authorization. Your plan decides which doctors, hospitals, and specialty centers you can use at in-network prices, and it can require approval before covering a treatment.
When you’re 65 and feeling fine, the network question feels abstract. You check that your primary care doctor is in it, and you move on.
The one-year escape hatch
Here’s the part that matters. When you first become eligible for Medicare, you get a six-month window during which any Medigap insurer has to sell you a policy. There are no health questions, no matter what conditions you have.
If you choose Medicare Advantage instead, federal law gives you one do-over. It’s called a trial right. For the first 12 months after your Advantage coverage starts, you can drop the plan, go back to Original Medicare, and buy a Medigap policy on a guaranteed basis, again with no health questions.
After those 12 months, the hatch closes.
What happens when you need it
Now fast-forward. You’re 72. You’ve been in your Advantage plan for seven years and it’s been fine, because you’ve been healthy. Then you get a diagnosis: a cancer, a heart condition, something that calls for a specific kind of care at a specific place. Maybe it’s a comprehensive cancer center two hours away. Maybe it’s the surgeon who does the most of this exact procedure in your region.
And that place isn’t in your plan’s network. Or your plan keeps denying the prior authorization.
So you think: fine, I’ll switch back to Original Medicare, where I can go anywhere.
You can do that. During open enrollment, Medicare itself won’t turn you away. But Original Medicare alone means paying that 20% with no ceiling, on cancer treatment, on surgery, on months of follow-up care. You need the Medigap supplement to make it workable.
And in most states, the Medigap company is now allowed to ask you about your health. They can ask about your diagnosis, your medications, your recent hospital stays. Then they can charge you more, or simply say no.
The moment you finally understand why you’d want Original Medicare is the exact moment you’re least able to get it.
“Wait, didn’t the ACA fix this?”
That was my first reaction too. The Affordable Care Act was supposed to end the era of insurers refusing people over preexisting conditions. For individual plans and employer plans, it did.
But the ACA’s preexisting-condition protections were never extended to Medigap. Supplement policies operate under their own set of federal rules. Those rules only guarantee you a policy during a handful of specific windows:
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your initial six months
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your one-year Advantage trial
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a few situations like your plan leaving your area or shutting down
Outside of those windows, federal law lets Medigap insurers ask about your health and decide based on it.
So we have a system where a 50-year-old with cancer can’t be turned down for health insurance. A 72-year-old with cancer can be turned down for the coverage that makes Original Medicare affordable. Age 65 is where the protection quietly runs out.
Does your state help?
Sometimes. A small number of states go further than federal law. New York and Connecticut require insurers to sell Medigap year-round regardless of health. A few other states, including Massachusetts and Maine, have their own versions of extra access.
You may also hear about the Medigap “birthday rule,” which about 15 states now have. It sounds like a fix, but read the fine print. It lets people who already have a Medigap policy switch to another one each year around their birthday. If you’re coming from Medicare Advantage, you don’t have a Medigap policy to switch from, so it generally won’t help you.
If you live anywhere else, assume the door locks after year one unless you confirm otherwise.
What I’d tell a friend turning 65
Make the decision with your 75-year-old self in mind. Think about the person who might someday need a specific hospital, not just the healthy person filling out the form. If you can afford Original Medicare plus Medigap, understand that it’s the only path that’s reliably hard to lose.
If you choose Advantage, put your trial deadline on the calendar. Mark month ten and month eleven, not month twelve. That’s your last easy chance to change your mind, and you’ll want time to shop and apply.
If you’re already past year one and healthy, consider your options now. You can apply for Medigap at any time; you just might face health questions. If you’re thinking of switching back, apply for the Medigap policy first and wait for approval before you leave your Advantage plan. Never drop your coverage on the hope that you’ll be accepted.
Look up the specialty centers you’d actually want. Before you pick an Advantage plan, check whether the major cancer and cardiac centers near you are in its network. Your family doctor isn’t the only one to check.
Get free, unbiased help. Every state has a State Health Insurance Assistance Program (SHIP), with counselors who don’t sell anything and know your state’s specific rules. You can find yours at shiphelp.org. Insurance agents can be helpful, but many are paid more to sell Advantage plans.
This should be fixed
None of this is a secret, exactly. It’s in the rules. But it’s buried, and the people making the choice at 65 almost never understand what they’re giving up. Along with the premium savings, they’re trading away a future option.
There’s a straightforward fix. We could extend the same preexisting-condition protections everyone else gets to Medigap. At minimum, every state could offer the kind of year-round access New York and Connecticut already have. Until that happens, the best protection is knowing about the door before it closes.
If you know someone turning 65 this year, or someone signing up a parent, please send this to them before December 7.