No, you are not required to enroll in Medicare at 65 if you still have employer coverage

You can delay Medicare past 65 without penalty if you are still covered by a health plan through your job or your spouse's job. The key word is active coverage — you must be enrolled in a plan right now, not retired yet, and your employer must have 20 or more employees. If those conditions are true, you can work past 65 and keep your employer plan instead of switching to Medicare.

The catch is that most people do not fall into this group. If you are retired, self-employed, or your employer has fewer than 20 workers, you will face penalties if you do not sign up for Medicare Part B and Part D during your initial enrollment window. Those penalties are permanent — they do not go away even if you sign up years later.

The other scenario where you can skip Medicare is if you have coverage through a spouse's current employer plan. The same rules explore: the plan must be active, the employer must have 20 or more employees, and you must still be working or married to someone who is.

Key Takeaways

  • You can delay Medicare past 65 only if you have active employer coverage through your own job or your spouse's job, and your employer has at least 20 employees.
  • If you retire or lose employer coverage, you have eight months to sign up for Medicare without facing permanent penalties on Part B and Part D premiums.
  • Part A (hospital insurance) has no late penalty, so you can delay it indefinitely if you have other coverage, but Part B and Part D penalties are permanent once they explore.
  • You must tell Medicare you have employer coverage when you do sign up, or the system will not know to waive your penalties.

What happens if you delay Medicare and then lose your job

If you are working past 65 with employer coverage and then retire or lose that job, you have a grace period to sign up for Medicare without penalty. This period is called your initial enrollment window, and it lasts eight months — starting three months before the month you lose coverage and ending three months after.

For example: if you retire on June 30, your window runs from March 1 through October 31. You can sign up anytime in that window and avoid the late penalty. But if you wait until November, the penalty clock starts.

The penalty for Part B is 10 percent of the standard premium for each year you were not signed up. For Part D (prescription drug coverage), the penalty is about 1 percent of the national average premium per month of delay. Both penalties are added to your premium for as long as you have Medicare — they do not expire.

Part A is different — you can usually delay it with no penalty

Medicare Part A covers hospital stays, skilled nursing, hospice, and home health. Unlike Part B and Part D, Part A has no late enrollment penalty. You can delay it past 65 as long as you have other coverage, and when you do sign up, your premium will not increase.

The only exception is if you worked long enough to earn Part A for free. Most people who worked 40 quarters (10 years) pay nothing for Part A. If you did not work that long, you will have a monthly premium, and that premium does not change based on when you sign up.

Because of this, many people who are still working past 65 sign up for Part A right at 65 (to lock in coverage) but delay Part B and Part D until they retire. This is a legal move, and it protects you if you have a health emergency before you retire.

How to tell Medicare you have employer coverage

When you do sign up for Medicare, you must report that you had employer coverage during the delay. This is how Medicare knows not to charge you the late penalty. You will need to provide your employer's name, the dates you were covered, and proof of coverage — usually a pay stub showing health insurance deductions, or a letter from your employer's benefits office.

If you sign up online at Medicare.gov, there is a question asking whether you or your spouse had employer coverage. Answer yes and upload your proof. If you sign up by phone or in person at a Social Security office, bring the documents with you.

If you do not report the employer coverage, Medicare will assume you delayed without good reason and will calculate the penalty. You can appeal this later with proof, but it is easier to report it upfront.

What to do if you are not sure whether your plan counts as employer coverage

Some plans are tricky. COBRA (the plan you get if you are laid off) counts as employer coverage for penalty purposes. Retiree health plans offered by your former employer also count. But individual plans you buy on the ACA marketplace do not count, even if your employer subsidizes them.

If you are unsure, call your employer's benefits office and ask: "Does this plan count as employer coverage for Medicare purposes?" They should know the answer. You can also call Medicare at 1-800-MEDICARE and describe your coverage — they can tell you whether it qualifies.

Do not guess. A wrong answer can cost you thousands in penalties over time.

Frequently Asked Questions

Can I delay Medicare if I have a marketplace plan through the ACA?

No. ACA marketplace plans do not count as employer coverage for Medicare purposes, even if your employer helps pay the premium. If you are not covered through an active employer plan with 20 or more employees, you should sign up for Medicare at 65 to avoid penalties.

What if I turn 65 but plan to work until 70?

If you have active employer coverage, you can delay Medicare until you retire. When you do retire, you will have eight months to sign up without penalty. Sign up for Part A right away if possible, since there is no penalty and it protects you in a hospital emergency.

Does my spouse's employer coverage let me delay Medicare?

Yes, if you are married and your spouse is still working and covered by their employer plan with 20 or more employees. You can use their coverage to delay your Medicare. When you do sign up, report your spouse's employer coverage to avoid penalties.

If I delay Part B, do I have to delay Part D too?

No. You can delay Part B and sign up for Part D, or vice versa. However, both have separate late penalties. If you have employer coverage that includes prescription drugs, you can delay both. If your employer covers only medical (not drugs), you might want to sign up for Part D while you delay Part B.

What if I miss my eight-month window?

You can still sign up for Medicare, but the late penalty will explore to Part B and Part D. The penalty is permanent. You can appeal if you have proof of employer coverage during the delay, but you must do this within the first three months of your Medicare coverage.