The Right Choice Agency
Turning 65

Do I Need Medicare Part B If I'm Still Working?

Licensed Medicare Agent at The Right Choice Agency3 min read

This question matters more than most people realize.

Because the answer can affect:

  • Penalties
  • Enrollment timing
  • Coordination of benefits
  • Future flexibility

Let's simplify it.

The Short Answer

It depends.

Specifically, it depends on:

  • Whether you are actively working
  • The size of your employer
  • Whether your coverage is considered creditable
  • How your employer plan coordinates with Medicare

Employer Size Matters

In many situations:

  • If your employer has 20 or more employees, your employer plan may pay first.
  • If fewer than 20 employees, Medicare may become primary.

Rules can vary depending on circumstances, so verification is important.

What Happens If You Delay Part B Incorrectly?

If you delay Part B without qualifying employer coverage:

  • You may incur a late enrollment penalty.
  • You may have to wait for the General Enrollment Period.
  • Coverage could be delayed.

That's why guessing isn't ideal.

When Delaying May Make Sense

Delaying Part B may make sense if:

  • You are actively working
  • Your employer coverage qualifies
  • You confirm your coordination of benefits structure

Documentation matters.

What to Check (Quick Checklist)

Before making a decision, confirm:

  • Are you actively working (not on COBRA)?
  • How many employees does your employer have?
  • Is your coverage considered creditable for Medicare?
  • Do you want Medicare as primary or secondary?

Common Misunderstandings

"I can always enroll later with no penalty." Not always true - penalty risk depends on your specific coverage situation.

"My HR said I'm fine." HR provides guidance, but Medicare enrollment decisions affect you long-term. Verify specifics.

"It's safer to delay." Only if your coverage qualifies and the coordination of benefits structure is confirmed.

The Real Risk

The risk isn't enrolling.

The risk is assuming.

  • Assuming HR covered it.
  • Assuming you're automatically safe.
  • Assuming you can fix it later.

Sometimes you can. Sometimes you can't.

Final Thought

If you're turning 65 and still working, the right move isn't to rush.

It's to verify.

We can walk through your employer coverage, confirm what applies, and help you make an informed decision.

If delaying is appropriate, we'll tell you.

If enrolling now makes sense, we'll explain why.



Benefits vary by plan, county, and eligibility. Always verify with the plan's Summary of Benefits before enrolling.

Part Bemployer coverageenrollmentworking past 65

Frequently Asked Questions

Do I have to enroll in Part B at 65 if I am still working?

Not always. If you are actively working and have qualifying employer coverage, you may be able to delay Part B without penalty. The decision depends on factors like employer size, whether your coverage is creditable, and how your employer plan coordinates with Medicare. Verifying your specific situation matters more than following a general rule.

Does employer size affect whether I need Part B?

Yes. In many situations, if your employer has 20 or more employees, the employer plan may pay first and Medicare may be secondary. If the employer has fewer than 20 employees, Medicare may become primary, which can affect whether delaying Part B is appropriate. Confirm with your benefits administrator and a licensed agent.

What happens if I delay Part B without qualifying coverage?

You may face a late enrollment penalty that stays with you for as long as you have Part B. You may also have to wait for the General Enrollment Period to enroll, which can delay your coverage start date. The penalty risk depends on your specific coverage situation, so guessing is not ideal.

How much time do I have to enroll in Part B after I stop working?

When active employer coverage ends, you generally have an 8-month Special Enrollment Period to enroll in Part B without penalty. The clock typically starts when you stop working or when active coverage ends, whichever comes first. COBRA coverage does not extend this window.

What should I check before deciding to delay Part B?

Confirm a few things first. . . whether you are actively working (not on COBRA or retiree-only coverage), how many employees your employer has, whether your coverage is creditable for Medicare, and how Medicare would coordinate as primary or secondary. HR can help, but the long-term consequences of an enrollment decision are yours, so verifying with a licensed Medicare agent is worthwhile.
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