Usually no.
If you are eligible for premium-free Medicare Part A, keeping an ACA Marketplace plan instead of Medicare is usually a bad move. You can lose Marketplace premium help, end up paying full price for the Marketplace plan, and create Medicare late-enrollment problems if you wait too long.
There is one main exception: if you have to pay a premium for Part A, you may be able to choose Marketplace coverage instead. But that is not how it works for most people turning 65.
Can You Keep a Marketplace Plan Instead of Medicare at 65?
Technically, you may be able to stay enrolled in a Marketplace plan for a period of time. But for most people, the practical answer is no, not as your main long-term plan once Medicare starts or once you are eligible for premium-free Part A.
Medicare says people with Marketplace coverage should usually sign up for Medicare when they are first eligible. Medicare also says that if you qualify for premium-free Part A, you are not eligible for help paying your Marketplace premiums.
Official pages:
That is the rule people miss. They think, “I like my Marketplace plan, so I will just keep it.” The problem is that Medicare and the Marketplace do not work like two equal options for most people once Medicare eligibility begins.
Why This Gets Expensive Fast
There are three common problems.
1. You can lose Marketplace subsidies
HealthCare.gov says that once you are eligible for Medicare Part A, or once your Medicare Part A or Medicare Advantage coverage starts, you cannot keep getting Marketplace savings on premiums or out-of-pocket costs.
CMS also warns that some people may have to pay back all or part of the advance premium tax credit they received for months when they should not have been getting it.
2. You may be paying full price for overlap
If you keep Marketplace coverage after Medicare starts, you may be paying for overlapping coverage that is no longer the right fit. CMS says some consumers choose to stay on a full-price Marketplace plan after Medicare begins, but dual enrollment is generally not recommended.
3. You can create a Medicare penalty problem
If you delay Medicare because you assumed your Marketplace plan counted the same as employer coverage, that can backfire.
Medicare is clear that Marketplace coverage is not the same as current employer coverage for delaying Part B. If you miss your Medicare Initial Enrollment Period, you may have to wait to enroll and you may owe late enrollment penalties.
If you want the bigger penalty background, read What Happens If You Do Not Sign Up for Medicare at 65?.
The Rule Most People Need to Know
For most people turning 65, the real dividing line is whether they qualify for premium-free Part A.
Most people do.
CMS says people usually qualify for premium-free Part A based on their own work record or a spouse’s work record. If that is your situation, Marketplace coverage is usually not the lane you should stay in.
The usual path is:
- enroll in Medicare on time
- end Marketplace coverage for the person starting Medicare
- keep Marketplace coverage only for household members who still need it
HealthCare.gov says Marketplace coverage does not end automatically when Medicare starts. You have to update the Marketplace application and end coverage for the person moving onto Medicare.
When Marketplace Instead of Medicare May Still Be an Option
There is one main exception.
Medicare says you may choose Marketplace coverage instead of Medicare if you have to pay a premium for Part A.
That is a smaller group of people. It can apply when someone does not qualify for premium-free Part A because they do not have enough Medicare work history on their own record or through a spouse.
Even then, the decision is not simple. Before choosing Marketplace over premium Part A, you need to compare:
- the monthly Part A premium
- the Part B premium
- the Marketplace premium without assumptions
- provider access
- drug coverage
- future penalty risk if you delay Medicare
If you are in that exception group, do not make the decision from memory or based on what a friend did. This is one of the situations where the details really matter.
Does a Marketplace Plan Protect You From Medicare Penalties?
Usually no.
Marketplace coverage is individual coverage. It is not the same as active employer group coverage from your own current job or your spouse’s current job.
That means it usually does not protect you the way current employer coverage can protect someone who delays Part B after 65.
If you are still working and comparing employer coverage versus Medicare, use these instead:
- Do You Need Medicare at 65 If You’re Still Working? Missouri Rules
- Can You Stay on Your Spouse’s Health Insurance Instead of Medicare at 65?
- What Is Creditable Coverage for Medicare?
Marketplace coverage belongs in the same caution bucket as other non-active-employer coverage people misunderstand, such as COBRA and some retiree plans.
If you are weighing COBRA too, read Medicare and COBRA: The Expensive Mistake Thousands of Retirees Make.
What If You Like Your Marketplace Doctors and Benefits Better?
That is understandable, but it does not change the Medicare rules.
A Marketplace plan can feel more familiar because you already know the network, the copays, and the prescription setup. But if you are eligible for premium-free Part A, the question is not just whether you like the plan. The question is whether staying on it creates:
- lost subsidy eligibility
- higher total premiums
- delayed Medicare enrollment risk
- a mess when you finally need to switch
That is why I would not frame this as, “Can I keep the plan I like?”
I would frame it as, “What does Medicare require me to do at 65, and what is the cleanest way to avoid overpaying or missing a deadline?”
How to Switch From Marketplace to Medicare Without Creating a Gap
This is the cleanest sequence for most people:
- confirm when your Medicare Initial Enrollment Period starts
- enroll in Medicare before the Marketplace plan handoff becomes urgent
- report the Medicare start date to the Marketplace
- end Marketplace coverage for the family member starting Medicare
- make sure any spouse or dependents who still need Marketplace coverage stay on the application correctly
HealthCare.gov says you can report a Medicare start date on your Marketplace application up to 3 months before Medicare starts.
If you need the sign-up timing itself, start with:
What If Only One Person in the Household Is Starting Medicare?
This is common.
One spouse turns 65 and moves to Medicare. The younger spouse or dependent children may still need Marketplace coverage.
HealthCare.gov says you should update the Marketplace application instead of assuming the whole household should be canceled. End Marketplace coverage only for the person starting Medicare, then confirm the remaining household members still have the right plan and subsidy setup.
That step gets missed more often than it should.
What I Tell Kansas City Area Clients
For people in Kansas City, Blue Springs, Lee’s Summit, and Overland Park, this usually comes up when someone is self-employed, between jobs, retiring before a spouse, or buying their own coverage before 65.
The mistake is assuming all non-employer coverage works the same.
It does not.
Marketplace coverage, COBRA, retiree coverage, spouse coverage, and active employer coverage all interact with Medicare differently. If you are not sure which bucket you are in, use the Medicare readiness checklist. It helps sort out work status, employer size, HSA issues, spouse coverage, and enrollment timing in one place.
The Practical Bottom Line
If you are eligible for premium-free Medicare Part A, keeping a Marketplace plan instead of Medicare at 65 is usually the wrong move.
You may be able to keep the Marketplace plan for a while, but usually without subsidies, without penalty protection, and without a good reason to keep paying for it.
The better move is usually to enroll in Medicare on time, end Marketplace coverage correctly, and then compare the Medicare path that fits you best.
If you are still deciding between Original Medicare plus a supplement or a Medicare Advantage plan after leaving the Marketplace, these two guides are the next place I would start:
- How Much Does a Medicare Supplement (Medigap) Plan Cost in 2026?
- Medicare Advantage vs Medigap in the Kansas City Area: Which Is Right for You?
Frequently Asked Questions
Can I keep my ACA Marketplace plan instead of Medicare when I turn 65?
Usually no. If you are eligible for premium-free Medicare Part A, keeping Marketplace coverage instead of Medicare can cause you to lose subsidy eligibility and create late-enrollment risk.
Can I have a Marketplace plan and Medicare at the same time?
You may remain enrolled in both for a time, but it is generally not recommended. If you are eligible for or enrolled in Medicare, Marketplace savings usually stop, and you may be paying full price for overlapping coverage.
Do I lose Marketplace subsidies when I become eligible for Medicare?
Usually yes if you are eligible for premium-free Part A. Medicare and HealthCare.gov both say people in that situation cannot keep Marketplace premium help.
What if I have to pay a premium for Medicare Part A?
That is the main exception. If you are not eligible for premium-free Part A, you may be able to choose Marketplace coverage instead, but you need to compare costs and future enrollment consequences carefully.
Does Marketplace coverage count like employer coverage for delaying Medicare Part B?
Usually no. Marketplace coverage is not the same as active employer coverage from current work, so it generally does not protect you from Part B late-enrollment problems.