You can choose a Marketplace plan instead of Medicare, but only in specific situations, and the decision has real consequences for your costs and coverage later.

If you are 65 or older, you are generally not allowed to buy Marketplace coverage instead of Medicare Part A and Part B. The Affordable Care Act Marketplace is designed for people under 65. If you turn 65, you must enroll in Medicare Part A and Part B during your Initial Enrollment Period — usually the seven months centered on your 65th birthday — or you will face permanent penalties on your premiums.

However, there are narrow exceptions. If you have active employer coverage through your job or your spouse's job, you can delay Medicare and stay on the employer plan instead. Some people in this situation also keep a Marketplace plan as a secondary option, though this is uncommon and requires careful coordination with your employer's benefits team. If you are not yet 65 and not yet may be able to access for Medicare, you can use the Marketplace without restriction.

Key Takeaways

  • Once you turn 65, you cannot use the Marketplace as your main coverage instead of Medicare Part A and Part B without facing permanent premium penalties.
  • If you have active employer coverage at 65, you may delay Medicare and stay on that plan, but you should confirm this with your employer's HR or benefits department before your 65th birthday.
  • Delaying Medicare because of employer coverage requires that you enroll in Medicare within eight months of losing that coverage, or you will owe back premiums and penalties.
  • If you are under 65 and not yet may be able to access for Medicare, you can use Marketplace coverage without any conflict with Medicare rules.
  • Choosing Marketplace coverage over Medicare when you are not may be able to access for the employer exception will result in a permanent 10 percent increase to your Part B premium for each year you delay.

When employer coverage lets you skip Medicare at 65

If you or your spouse are still working and have health insurance through that job, you may have the right to delay Medicare and stay on the employer plan instead. This is called creditable coverage, and it is the main legal reason to turn down Medicare at 65.

The employer plan must meet certain standards — it must cover hospital care, doctor visits, and prescription drugs at a level comparable to Medicare. Most large employer plans do. If you have this coverage, you do not have to enroll in Medicare at 65, and you will not face penalties for delaying.

However, you must enroll in Medicare within eight months after your employment ends or your coverage stops. If you miss this window, you will owe back premiums for the months you were uninsured, plus a permanent 10 percent penalty on your Part B premium for each year you delayed. Your employer's benefits team can tell you whether your plan qualifies as creditable coverage and what your enrollment important date will be.

What happens if you try to use Marketplace coverage instead of Medicare

If you are 65 or older and do not have active employer coverage, the Marketplace will not let you buy a plan. The enrollment system checks your age and Medicare status. If you are 65 and not enrolled in Medicare Part A or Part B, you will be directed to enroll in Medicare instead.

If you somehow obtain Marketplace coverage while you should be on Medicare, that coverage will not be valid. Claims will be denied, and you will still owe the permanent Medicare penalty. The penalty is 10 percent of the standard Part B premium for each full year you were may be able to access but did not enroll. This penalty stays with you for life, even after you eventually enroll.

For example, if you delayed Medicare for three years after turning 65 without a valid reason, your Part B premium will be 30 percent higher than the standard rate, permanently. This penalty does not go away if you enroll later.

How Marketplace subsidies work differently than Medicare

If you are under 65 and using Marketplace coverage, you may receive a premium tax credit or cost-sharing reduction based on your household income. These subsidies are calculated differently than Medicare's income-based help.

Medicare uses a different formula for Part D (prescription drug) subsidies and does not offer premium help for Part B itself. If you are under 65 and your income is low, the Marketplace may offer you more financial help than Medicare would. This is one reason some people under 65 prefer Marketplace coverage — but once you turn 65, you must switch to Medicare regardless of the subsidy difference.

If you are currently on a Marketplace plan and will turn 65 soon, contact your Marketplace plan to ask about your transition options. Some plans have special processes to help you move to Medicare without a gap in coverage.

Coordinating Marketplace coverage with Medicare if you have employer insurance

In rare cases, someone with active employer coverage at 65 might keep both a Marketplace plan and Medicare. This is not common, and it requires careful planning with your employer's benefits team and the Marketplace.

If you are in this situation, you would enroll in Medicare Part A and Part B (to avoid penalties) but use your employer plan as primary coverage. A Marketplace plan would act as a backup. This coordination is complex and can create billing confusion, so speak with your employer's HR department and your Marketplace plan before attempting it.

Most people with employer coverage at 65 straightforward stay on the employer plan and delay Medicare entirely, which is simpler and does not require managing multiple plans.

What to do if you are under 65 and considering your options

If you are under 65 and not yet may be able to access for Medicare, you have full freedom to use Marketplace coverage. You do not need to worry about Medicare penalties or enrollment important date. You can enroll during the annual open enrollment period (usually November 1 to January 15) or if you have a may have access to life event such as losing employer coverage, moving, or a change in household income.

If you are approaching 65, start planning at least three months before your birthday. Contact your employer's benefits team to confirm whether your coverage is creditable and what your options are. If you do not have employer coverage, contact Medicare directly at 1-800-MEDICARE or visit Medicare.gov to understand your enrollment requirements and any penalties you might face.

Do not assume that keeping your current Marketplace plan will work once you turn 65. It will not, and delaying action can be costly.

Frequently Asked Questions

What if I am 65 but still working and do not want Medicare?

You can delay Medicare only if your employer coverage is creditable — meaning it meets Medicare's standards for hospital, doctor, and drug coverage. Your employer's benefits team can confirm this. If your coverage does not may have access to, you must enroll in Medicare or face permanent penalties. Confirm your status before your 65th birthday.

Will I owe back premiums if I delay Medicare because of employer coverage?

No, as long as your employer coverage is creditable and you enroll in Medicare within eight months of losing that coverage. If you miss the eight-month window, you will owe back premiums and a permanent 10 percent penalty on Part B for each year you delayed.

Can I use Marketplace coverage as a backup to my employer plan at 65?

Technically yes, but it is rarely done and creates billing complexity. If you want to do this, work with your employer's benefits team and your Marketplace plan to coordinate coverage. Most people with employer insurance at 65 straightforward stay on that plan and delay Medicare instead.

What happens to my Marketplace subsidies when I turn 65?

Your Marketplace plan will end, and you will transition to Medicare. You will no longer receive Marketplace subsidies. Medicare has its own income-based help programs, but they work differently. Contact Medicare at 1-800-MEDICARE to learn what help you may receive.

If I delay Medicare and then enroll late, how much will the penalty cost?

The penalty is 10 percent of the standard Part B premium for each full year you delayed. This amount changes yearly. For example, if the standard premium is $200 and you delayed for two years, your premium would be $240 permanently. The penalty does not expire.