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Your transition from ACA-compliant coverage won't be automatic, but 'shifting gears' to new coverage doesn’t have to be traumatic.
What information do I need to enroll in Medicare online?
You don't have to sign up for Medicare online, but if you're trying to save time, completing an online application may be the best way to go.
Is Original Medicare coverage enough?
If you shun private coverage, can you get by on Original Medicare without purchasing supplemental coverage (Medigap and Part D prescription coverage) or using a Medicare Advantage plan?
When is the best time to enroll in Medicare?
Q: When is the best time to enroll in Medicare? A: The best time to enroll is during the open enrollment window around your 65th birthday – preferably in the three months before the month you turn 65, so that you'll have Medicare coverage by the time you turn 65.
How do I enroll in Medicare?
Learn how and when to enroll in Original Medicare, Medicare Advantage, Medigap, and Part D coverage. Get plan information and a free quote today.
Important Medicare enrollment dates
Enrollment dates for Medicare are critical. Missing an enrollment date could cost you higher premiums down the line — or it could cost you coverage entirely.
For some people enrolled in individual market health coverage through a health insurance exchange, Medicare is just around the corner. And while people have been transitioning from individual coverage to Medicare for decades, the process changed a bit once Obamacare was enacted.
If you’re already receiving Social Security or Railroad Retirement benefits, the government will automatically enroll you in Medicare Part A the month you turn 65, with your Medicare card arriving in the mail about three months before you turn 65.
If you’re not yet receiving Social Security or Railroad Retirement benefits, you’ll have a seven-month window during which you can enroll in Medicare, which you’ll do through the Social Security Administration. Your Medicare card will be sent to you after you enroll.
Your enrollment window starts three months before the month you turn 65, includes the month you turn 65, and then continues for another three months. (Note that you’ll need to enroll during the months prior to your birth month in order to have coverage that takes effect the month you turn 65. If you enroll during your birth month or one of the three following months, your effective date for Part B will be delayed; your effective date for Part A will only be delayed if you have to pay a premium for Part A. As of 2023, the delay for Part B will no longer be applicable, as coverage will simply take effect the month following enrollment.)
Prior to 2014, coverage in the individual market generally terminated automatically when an enrollee reached age 65. Age was a limiting factor for enrollment – people 65 and over typically could not obtain coverage in the individual market, nor could they keep it once they reached 65, even if they were not eligible for Medicare.
That has changed under the Affordable Care Act, so you’ll need to actively cancel your exchange coverage in order to transition to Medicare.
And under regulations that CMS finalized in 2018, insurers that offer individual market coverage along with Medicare Advantage coverage cannot automatically transition their individual market enrollees to their Medicare Advantage plan. Consumers can opt into this feature, but seamless automatic enrollment is only allowed when a person is already enrolled in the insurer’s Medicaid managed care plan and is going to be transitioned to a special needs plan for dual-eligible (Medicaid and Medicaid) enrollees.
You are not required to cancel your exchange plan when you enroll in Medicare, but if you’re getting premium subsidies, they’ll end when you become eligible for premium-free Medicare (with some flexibility in terms of the exact date for this, as described below). And if you keep your individual market exchange plan and don’t sign up for Medicare when you first become eligible, you’ll have to pay higher Medicare Part B premiums for the rest of your life, once you do enroll in Medicare, due to the late enrollment penalty.
When you have coverage in the exchange — for the full year or only part of the year — your total premium subsidy amount for the year is based on your total income for that year relative to the poverty level (which determines the amount you’re expected to pay for the benchmark plan), and the cost of the benchmark plan in your area. This is explained in more detail here, and illustrated on Form 8962, which is the tax form that you use to reconcile your premium subsidy on your tax return after the year is over. So although your premium subsidy ends when you switch to Medicare, this does not affect the subsidy amount that you can receive for each of the months prior to that transition.
Because Medicare has a fairly long initial enrollment window, with varying effective dates depending on when you enroll, the exact date that your premium subsidy terminates will depend on when you enroll in Medicare. The details for this are clarified in a “Marketplace to Medicare” guide that CMS published in July 2020.
(Note that on page 9 of IRS Publication 974, Example 1, about “Ellen,” shows a scenario that differs from the CMS guide. After discussing this with the IRS Chief Counsel’s office, we feel fairly certain that the CMS guide, which was published much more recently, is correct. Example 1 about “Ellen” in IRS Publication 974 does not account for the fact that Ellen’s Part A coverage would be retroactive to the month in which she turned 65.
Premium subsidies would technically end at that point, but the provision applying to retroactive government coverage — described at the bottom of page 9 in IRS Publication 974 — would prevent Ellen from losing her premium subsidy until the end of the month in which she applies for coverage (or the month that the coverage is approved, which could potentially be a later month). In other words, Ellen wouldn’t lose her premium subsidy for the month she enrolled or the months before that. And this matches what’s in the recently published guidance from CMS, in the example about “Paul” on page 41.
But we caution you to discuss this issue with an accountant if you’re receiving premium subsidies in the marketplace and are planning to enroll in Medicare in the latter portion of your initial enrollment period. Be warned that the guidance from the marketplace on this issue does not entirely line up with the guidance in IRS Publication 974.)
The short story is that if you enroll in Medicare during the first four months of your initial enrollment window, your transition to Medicare will be seamless, with subsidy eligibility continuing through the last day of the month prior to the month that your Medicare coverage begins. If you enroll in Medicare during the final three months of your initial enrollment period, your premium subsidy will likely end before your Part B coverage begins, although your Part A coverage should be backdated to the month you turned 65. And if you don’t enroll in Medicare at all during your initial enrollment window, your premium subsidies will end a few months after you turn 65. Here are the details:
If you’re not already receiving retirement benefits, you’ll need to enroll in Medicare.
Note that while you’re allowed to keep your exchange plan – at full price – after you become eligible for Medicare, it’s illegal under the Social Security Act for anyone to sell you an exchange plan after you’re already eligible for premium-free Medicare Part A.
However, you can purchase a plan in the exchange in lieu of Medicare if you would otherwise be required to pay premiums for Medicare Part A due to a work history that’s insufficient to qualify for premium-free Part A benefits. And if you’re already enrolled in a plan through the exchange and would have to pay a premium for Medicare Part A, you can opt instead to continue to receive a premium subsidy in the exchange, assuming you continue to meet the subsidy eligibility requirements.
In virtually all cases, keeping your exchange plan along with Medicare would be a waste of money. The plans would provide duplicate coverage, and individual market exchange plans are not set up to coordinate with Medicare the way employer-sponsored plans are.
So your exchange plan would not function as secondary coverage. Instead, it simply would not be required to provide coverage at all if you also had Medicare coverage (small business plans sold through the SHOP exchanges do coordinate benefits with Medicare, since they’re employer-sponsored plans rather than individual market plans).
What you’ll need instead is a Medicare Advantage plan or a Medigap plan and Part D plan to supplement your Medicare coverage. Here’s a resource to help you figure out what would work best in your situation.
If you’re enrolled in a plan through HealthCare.gov, you can follow these directions for canceling your exchange plan so you can transition to Medicare. Note that you can remove only yourself from the policy (without canceling the whole policy) if you have other family members who need to stay on the exchange plan.
If you’re in a state with a state-run exchange, you’ll need to follow the steps outlined by your exchange. Regardless of what state you’re in, if in doubt, ask for help. Contact the exchange call center or your broker if you have one. Document the call and keep a record of your cancellation request.
Canceling your exchange coverage to switch to Medicare should be relatively simple, but we have seen cases where cancellation requests weren’t transmitted to the carrier in a timely manner. For that reason, it may be wise to switch from bank draft to paper billing prior to submitting your cancellation request.
That way, if something goes wrong when the cancellation request is being processed, you won’t end up with premiums being auto-drafted from your bank account after your coverage was supposed to be terminated.
The standard advice is to avoid any gaps in coverage. So if your Medicare will start August 1, you would schedule your exchange plan to terminate July 31. But while that’s undoubtedly the safest course of action, some people feel comfortable taking a gamble during their last month or two before Medicare kicks in, and they cancel their coverage early.
Be cautious about this approach if you have pre-existing conditions, however. If you’re going to enroll in Medicare A and B, you’re probably going to want a Medigap plan to supplement your coverage. Medigap plans are guaranteed issue during your initial six-month enrollment period, but they can impose a pre-existing condition waiting period if you’ve had a gap in prior coverage of more than 63 days.
Once you’ve taken steps to enroll in Medicare and schedule the cancellation of your exchange plan, take some time to familiarize yourself with the various coverage options that can improve upon the basic coverage provided by Medicare. And then enjoy your Medicare – you’ve earned it!
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 exchange updates are regularly cited by media who cover health reform and by other health insurance experts.