You are not required to take Medicare at 65 if you are still working and covered by your employer's health plan

No, you do not have to enroll in Medicare the moment you turn 65. If you are still working and your employer offers health coverage, you can delay Medicare without penalty — but only under specific conditions. The key is whether your employer has 20 or more employees. If it does, your employer's plan is considered primary, and you can legally turn down Medicare.

If your employer has fewer than 20 employees, Medicare becomes primary when you turn 65, even if you are still working. In that case, you should enroll in Medicare to avoid gaps in coverage and potential late-enrollment penalties later.

The rules are different if you are self-employed, retired, or not covered by an employer plan. In those situations, you should enroll in Medicare during your initial enrollment period — the seven-month window that starts three months before the month you turn 65 and ends three months after.

Key Takeaways

  • If your employer has 20 or more employees and offers you health coverage, you can delay Medicare without penalty while you work.
  • If your employer has fewer than 20 employees, you should enroll in Medicare at 65 because it becomes your primary insurance.
  • Missing your initial enrollment period without may have access to for an exception can result in permanent premium increases on Medicare Part B and Part D.
  • You must notify Social Security when you leave your job or lose employer coverage so you can enroll in Medicare without penalty.
  • Your initial enrollment period is seven months long: three months before the month you turn 65, the month itself, and three months after.

What happens if you delay Medicare while still working

When you delay Medicare because you have employer coverage, you are protected from late-enrollment penalties as long as you meet the conditions. This protection is called creditable coverage — it means your employer plan covers at least as much as Medicare does.

You do not need to do anything special to claim this protection. However, you should keep records showing that you had employer coverage and the dates it was active. When you eventually enroll in Medicare, you will tell Social Security about your employer plan, and they will verify the coverage dates.

The moment you lose your job or your employer coverage ends, you have eight months to enroll in Medicare without penalty. This eight-month window is called your special enrollment period. If you miss it, you will face a permanent 10 percent increase on your Part B premium for each year you could have been enrolled but were not.

When you must enroll in Medicare even while working

If your employer has fewer than 20 employees, you cannot delay Medicare. You must enroll during your initial enrollment period, which is the seven-month window centered on your 65th birthday. Enrolling on time protects you from penalties and ensures you have coverage when your employer plan ends.

Some small employers offer retiree health plans that continue after you leave work. Even if yours does, Medicare becomes primary at 65 when the employer has fewer than 20 employees. Your retiree plan can still cover costs that Medicare does not, but Medicare must be your main insurance.

If you work past 65 for a small employer and do not enroll in Medicare, you will have no primary coverage once you leave that job. This gap can be expensive and difficult to fix later, especially if you develop health problems during the gap.

How to tell Social Security about your employer coverage

You do not have to notify anyone when you delay Medicare. However, when you eventually leave your job or lose coverage, you must contact Social Security within eight months to start your special enrollment period. You can do this online at ssa.gov, by phone at 1-800-772-1213, or in person at your local Social Security office.

Have these documents ready when you contact them: your Social Security number, proof of the date your employer coverage ended (such as a termination letter or final pay stub), and your employer's name and the number of employees. Social Security will use this information to verify that you had creditable coverage and to enroll you without penalty.

If you wait longer than eight months after losing coverage, you will still be able to enroll in Medicare, but you will owe the late-enrollment penalty. The penalty is permanent — it stays on your Part B and Part D premiums for as long as you have Medicare.

What to do if you are self-employed or retired before 65

If you are self-employed, your business does not count as employer coverage for Medicare purposes. You should enroll during your initial enrollment period, which begins three months before you turn 65. Missing this window means a permanent 10 percent increase on your Part B premium.

If you retired before 65 and lost your employer coverage, you have eight months from the date coverage ended to enroll in Medicare without penalty. This is your special enrollment period. If your former employer offers retiree coverage, that counts as creditable coverage, and you can delay Medicare as long as the retiree plan is active — but you must enroll within eight months of losing that coverage.

If you are not yet 65 and have no health coverage, you may be able to purchase a plan through the Health Insurance Marketplace while you wait for Medicare. You can find plans at healthcare.gov or through your state's marketplace.

Understanding Part B and Part D enrollment penalties

The Part B penalty applies if you do not enroll during your initial enrollment period and do not have creditable coverage. It is 10 percent of the standard Part B premium for each full year you could have been enrolled but were not. If you delay for three years, your penalty is 30 percent — and it is permanent.

The Part D penalty (for prescription drug coverage) works the same way. If you go 63 days or more without creditable drug coverage after your initial enrollment period ends, you will owe a penalty when you finally enroll. The penalty is about 1 percent of the national average Part D premium for each month you were without coverage.

These penalties are calculated based on when you should have enrolled, not when you actually do. The only way to avoid them is to enroll on time or to have creditable coverage that qualifies you for a special enrollment period.

Special situations: Medicare and working past 65

If you are still working at 65 and covered by your employer's plan, you have choices. With a large employer (20+ employees), you can skip Medicare entirely and stay on the employer plan. With a small employer (fewer than 20), you must enroll in Medicare but can keep the employer plan as secondary coverage.

Some people enroll in Medicare Part A only (hospital insurance) and delay Part B (medical insurance) while they work. This is allowed if you have employer coverage, but it complicates things later. When you finally enroll in Part B, you may owe a late-enrollment penalty unless you have documentation of creditable coverage. It is usually simpler to enroll in both parts at once.

If you are working past 65 and unsure whether your employer has 20 or more employees, ask your human resources or benefits department. They can tell you the company size and whether your coverage qualifies as creditable coverage under Medicare rules.

Frequently Asked Questions

What if I turn 65 while still working but plan to retire in a few months?

You should still enroll in Medicare during your initial enrollment period, which is seven months long. If you wait until after you retire, you may miss the window and face penalties. Enrolling early does not cost you anything if you are still covered by your employer plan — Medicare will straightforward be secondary until your employer coverage ends.

Can I enroll in Medicare Part A but not Part B?

Yes, you can enroll in Part A only if you have employer coverage. However, when you eventually enroll in Part B, you may owe a late-enrollment penalty unless you have proof of creditable coverage. It is usually better to enroll in both parts during your initial enrollment period to avoid complications later.

What counts as creditable coverage?

Creditable coverage is health insurance that is at least as good as Medicare. Employer plans, retiree plans, COBRA coverage, and some union plans count. Individual plans you buy yourself usually do not. Your employer or plan administrator can tell you whether your coverage is creditable under Medicare rules.

Do I lose my employer coverage when I turn 65?

No. Your employer coverage continues as long as you work and meet the plan's requirements. Turning 65 does not automatically end your coverage. However, some employers offer retiree plans that begin when you retire, separate from the active employee plan.

What if my employer says I have to take Medicare at 65?

Your employer cannot force you to enroll in Medicare if you have active employer coverage and the company has 20 or more employees. If the company has fewer than 20 employees, you should enroll in Medicare, but your employer coverage can continue as secondary. If you believe your employer is violating these rules, contact your state's insurance commissioner or the Centers for Medicare and Medicaid Services.