Virtually all Americans transition to Medicare at age 65. Some continue to also have coverage under the plan they had prior to 65 (e.g., employer-sponsored coverage, or Medicaid), while others purchase new supplemental plans to go along with their new Medicare coverage. But one way or another, Medicare is part of the health coverage that nearly all Americans have once they reach 65.
But since our health coverage system is much more of a patchwork quilt prior to age 65, people transition to Medicare from a variety of other types of coverage. Most are coming from employer-sponsored plans. Some are coming from self-purchased individual/family plans. (We’ve explained more about how that transition works.) And ever since Medicaid was expanded under the Affordable Care Act (ACA) in 2014, some have been coming from expanded Medicaid.
Millions with expanded Medicaid will transition to Medicare
As of the end of 2024, there were about 20.7 million people covered under expanded Medicaid, accounting for more than a quarter of all Medicaid enrollees nationwide.
Under ACA rules, there are no asset limitations for Medicaid eligibility for pregnant women, children, or adults who are eligible due to Medicaid expansion. Instead, eligibility is just based on an ACA-specific version of modified adjusted gross income (MAGI), along with immigration status.
But Medicaid expansion and the MAGI-based eligibility rules only apply to adults under the age of 65. After that, expanded Medicaid is no longer available. To be clear, Medicaid remains available after age 65 and many older adults rely on it — for example, the majority of nursing home residents in the United States have Medicaid coverage in addition to their Medicare coverage (Medicaid covers nursing home costs, whereas Medicare does not).
But once you turn 65, eligibility for Medicaid is based on both income and assets. There’s some variation from one state to another (select your state on this map to see more details), but in general, the income limits are lower than those that apply to the Medicaid expansion population, and the asset limits are quite restrictive.
This can lead to some sticker shock for people who were eligible for income-based expanded Medicaid before turning 65. They may have to transition to Medicare and simultaneously lose their eligibility for Medicaid due to the more restrictive eligibility rules once they turn 65.
What costs should you expect if you’re moving from expanded Medicaid to Medicare?
If you’ve been enrolled in expanded Medicaid, it’s likely that you haven’t had to pay any monthly premiums (some states have charged premiums in the past and some are seeking approval to charge premiums for some enrollees, but most are not). But that may change when you turn 65 and transition to Medicare.
For 99% of Medicare beneficiaries, Medicare Part A (hospital coverage) is premium-free, but Medicare Part B (outpatient and physician coverage) costs $202.90/month in 2026 for most enrollees. This is true even for many of the people who qualified for premium-free expanded Medicaid prior to age 65.
However, full Medicaid coverage (in addition to Medicare) is available to people age 65+ who have very limited income and assets. And there are Medicare Savings Programs (MSPs) that will cover the cost of the Part B premiums (and in some cases, Medicare out-of-pocket costs as well), for people who are eligible. Depending on the MSP, the income limits can be quite a bit higher than the income limit for expanded Medicaid eligibility.
But the catch is the asset limits. There are several states that don’t use asset limits for their MSPs. But in most states, to be eligible for MSP assistance in 2025, your assets can’t exceed $9,660 if you’re single, or $14,470 if you’re a couple. Some assets aren’t taken into consideration, including your primary residence, one car, household belongings, and a burial plot, along with up to $1,500 in burial expenses.
Other assets are counted though, including savings accounts and retirement accounts. These assets were not taken into consideration when eligibility for expanded Medicaid was determined in the years before you turned 65. So if you have a modest retirement account balance and a low income, you may have been eligible for expanded Medicaid prior to age 65, but might find that you’re ineligible for any sort of financial assistance with your health coverage once you transition to Medicare.
Moving from expanded Medicaid to Medicare Advantage
Depending on your circumstances, you might choose to enroll in a Medicare Advantage plan that provides prescription, dental, and vision coverage – and caps enrollees’ annual out-of-pocket costs for Parts A and B, which traditional Medicare does not do. Many of these plans are available with no additional premiums, which means you’d pay just the $202.90/month for your Part B coverage (that’s for 2026; the amount changes each year).
And some Medicare Advantage plans even have a “give back” benefit that pays some of that Part B premium for you.
Transitioning from expanded Medicaid to Medigap
The more expensive way to cover the gaps in traditional Medicare is to buy a Medigap policy. The premiums for these policies vary by state and by the specific plan that’s purchased. Nationwide, average Medigap premiums in 2023 ranged from $92/month for Medigap Plan K to $298/month for Plan C, but there’s considerable variation from state to state and from one insurer to another. The Medigap premium is charged in addition to premiums for Medicare Parts B and D (prescription drugs).
The payoff is maintaining unlimited access to all healthcare providers, nationwide, who accept Medicare – which almost all providers do — as well as potentially lower out-of-pocket costs when you need medical care. You also won’t need to worry about prior authorization, as that’s very rarely used with Original Medicare (Medigap plans pay out-of-pocket costs for services covered by Original Medicare, so they don’t apply prior authorization rules).
Here’s more about choosing between Medigap and Medicare Advantage.
Medicare can pull you out of the coverage gap
Although the transition from expanded Medicaid to Medicare can be financially challenging, eligibility for Medicare will likely come as a welcome relief if you’ve been in the coverage gap that still exists in nine states that have refused to expand Medicaid.
Being in the coverage gap means you have an income below the federal poverty level. Once you transition to Medicare – so as long as your assets don’t disqualify you – you’ll be eligible for the most robust MSP, which covers Original Medicare’s premiums, deductibles, and coinsurance.
Even if your assets do make you ineligible for an MSP, you could still enroll in Original Medicare or a zero-premium Medicare Advantage plan and pay just $202.90/month in premiums in 2026.
And although it’s not an ideal solution, you do have the option to reject Part B and just enroll in Part A, which is premium-free as long as you or your spouse has worked at least 10 years in the U.S. and paid Medicare taxes. But it’s important to understand the consequences of rejecting/delaying Part B. If you don’t enroll and you’re not covered by an employer’s plan, you’ll face a late-enrollment penalty once you do eventually enroll in Part B. And you’ll only be able to sign up during the general enrollment period that runs from January through March each year.
Although the asset tests in most states might still put an MSP or full Medicaid coverage out of reach once you transition to Medicare, the option to have health coverage for just the cost of Part B (under $203/month in 2026) is far better than the alternatives that exist for most people under age 65 in the coverage gap.
In most states, unsubsidized premiums for ACA-compliant coverage are three times a high for a 64-year-old versus a 21-year-old, and people in the coverage gap are not eligible for any financial assistance with their coverage. (Low-income Americans in states with coverage gaps should be aware of the minimum income requirement for ACA marketplace subsidies and try to earn an income of at least 100% of the federal poverty level in order to avoid the coverage gap.)
For those in the coverage gap, the transition to Medicare can be a significant improvement in their overall access to affordable health coverage and care, whereas the opposite may be true for some people who are enrolled in expanded Medicaid before becoming eligible for Medicare.
What steps do I need to take to move from expanded Medicaid to Medicare?
If you’re enrolled in expanded Medicaid and you’ll soon be 65, you’ll want to familiarize yourself with the health coverage and assistance programs that might be available to you.
Understand that although your assets have not been taken into consideration to determine your eligibility for expanded Medicaid, that will likely change when you turn 65. As of 2025, every state except Arizona and California had an asset limit for full Medicaid eligibility if you’re 65 or older (California will have an asset limit starting in 2026, although it’s much higher than the asset limits in most other states).
But even if you don’t qualify for full Medicaid, if you qualify for an MSP – particularly the Qualified Medicare Beneficiary program along with Extra Help for prescription drugs – you may find that you still qualify for premium-free coverage and very limited out-of-pocket costs.
You’ll want to reach out to your state’s Medicaid office before turning 65, to be sure you understand the specifics of 65+ Medicaid and MSP eligibility.
You can also reach out to the Medicare SHIP (State Health Insurance Assistance Program) in your state, to see what resources and assistance are available to you.
You might also want to find a Medicare broker who can help you understand the available Medigap, Part D, and Medicare Advantage plans. Your limited income might make you a good candidate for a low-cost or zero-premium Medicare Advantage plan, leaving you with just the cost of Medicare Part B.
But on the other hand, if you have substantial assets and prefer the flexibility and robust coverage provided by Original Medicare plus a Medigap plan, you might find that the higher premiums are worth it (to get much wider access to providers, lower out-of-pocket costs, and virtually no prior authorization requirements) and you’re able to tap into your savings to cover the monthly cost.
Here’s more about choosing between Medigap and Medicare Advantage — there’s no single solution that works for everyone, so take your time and compare the options available to you.
Is there a Medicare special enrollment period due to loss of Medicaid?
Yes. If you lose Medicaid after you’re already eligible for Medicare (but not yet enrolled), you’ll have a six-month special enrollment period during which you can sign up for Medicare Part B (and Medicare Part A if you have to pay a premium for it).
To clarify, you can sign up for Part A anytime after you’re initially eligible, as long as you don’t owe a premium for Part A, which is true for almost everyone. But if you do have to pay a premium for Part A, the special enrollment period also gives access to Part A.
People who use this special enrollment period have an opportunity to have their Medicare coverage begin retroactively back to the day after their Medicaid ended, although Medicare premiums would also have to be paid back to that date.
Louise Norris is an individual health insurance broker who has been writing about health insurance and health reform since 2006. She has written dozens of opinions and educational pieces about the Affordable Care Act for healthinsurance.org. Her state health marketplace updates are regularly cited by media who cover health reform and by other health insurance experts.
