Working Past 65

Medicare and Employer Coverage: What to Know Before You Turn 65

If you are still working when you turn 65, you may not need to rush into every part of Medicare. But this is not something to guess on. Your employer size, your current coverage, your spouse’s coverage, and your HSA all matter.

Original Author: Michelle Heberling

Date Published: June 11, 2026

Last Reviewed: June 11, 2026

Sources: Medicare.gov, CMS.gov, SSA.gov

Quick Answer

If you are still working at 65 and covered by active employer group health insurance, you may be able to delay Medicare Part B without a penalty. But the rules depend heavily on the size of the employer and whether the coverage is based on current employment.

Why This Matters

Turning 65 used to feel like the automatic Medicare moment.

But a lot of people are still working. Some are covered through their own employer. Some are covered through a spouse. Some have an HSA. Some are helping aging parents while trying to figure out their own retirement.

The problem is that Medicare does not treat every kind of coverage the same.

Important: Employer coverage, COBRA, retiree coverage, Marketplace coverage, and VA coverage can all work differently with Medicare. Do not assume they protect you from penalties.

The Employer Coverage Pathway

Before you decide whether to enroll in Medicare or delay Part B, walk through this:

Turning 65?

Still Working?

Employer Coverage?

20+ Employees?

Review Before Deciding

When You May Be Able to Delay Part B

You may be able to delay Medicare Part B if you are covered by a group health plan based on current employment. This could be through your job or your spouse’s job.

This is different from retiree coverage or COBRA. The phrase that matters is current employment.

The 20-employee rule

If the employer has 20 or more employees, the employer plan is usually primary and Medicare is secondary for people who are 65 or older and still actively working.

If the employer has fewer than 20 employees, Medicare may be primary. That means delaying Medicare could create problems.

Why Employer Size Matters

Employer size affects who pays first.

If Medicare is supposed to be primary and you are not enrolled, your employer plan may not pay the way you expect.

This is why you should never rely only on what a coworker did. Their situation may look similar and still be completely different.

Should You Take Part A at 65?

Many people qualify for premium-free Part A and enroll when they turn 65.

But there is one big catch: if you are contributing to a Health Savings Account, enrolling in any part of Medicare generally means you can no longer contribute to the HSA.

This is one of the most commonly missed planning points for people working past 65.

HSA warning: If you want to keep contributing to an HSA after 65, check the Medicare rules before enrolling in Part A or Part B.

What About Part D Drug Coverage?

If your employer drug coverage is considered creditable, you may be able to delay Medicare Part D without a penalty.

Creditable means the coverage is expected to pay, on average, at least as much as standard Medicare prescription drug coverage.

Your employer should provide a notice each year telling you whether your prescription coverage is creditable. Keep that notice.

Questions to Ask HR Before You Decide

Is this coverage based on current employment?
How many employees does the company have?
Will the employer plan pay primary or secondary after I turn 65?
Is the prescription drug coverage creditable?
Can I keep contributing to my HSA?
What happens when I retire or leave the job?
Will my spouse be affected if I change coverage?

When You Leave the Job

Once active employment or employer coverage ends, the timing changes.

You may have a Special Enrollment Period to enroll in Part B without a late enrollment penalty. But you do not want to wait until the last minute.

This is where people can get confused if COBRA or retiree coverage is offered. Those are not the same as active employer coverage.

Common Mistakes

Assuming all employer coverage lets you delay Medicare
Forgetting to ask whether the company has 20 or more employees
Taking Part A while still contributing to an HSA
Assuming COBRA extends the Part B enrollment window
Not keeping proof of creditable drug coverage
Waiting until retirement month to figure everything out

Michelle’s Take

This is one of those Medicare topics where the answer is not “yes” or “no.” It depends.

That does not mean it has to be overwhelming. It just means you need to ask the right questions before you make the decision.

If you are still working at 65, your goal is not to sign up for everything automatically. Your goal is to avoid penalties, avoid duplicate coverage, and avoid accidentally messing up your HSA.

Still working and turning 65?

Let’s review your employer coverage, HSA, and Medicare timing before you decide what to enroll in and what to delay.

Schedule a Medicare Review

Sources

Source information reviewed as of June 11, 2026. Medicare rules can change, so always confirm your situation with Medicare, Social Security, your employer benefits administrator, SHIP, or a licensed Medicare professional.

This information is for education only and is not legal, tax, financial, insurance, or medical advice. Medicare rules vary by situation. Michelle Heberling is not connected with or endorsed by the U.S. government or the federal Medicare program.