Can I Delay Medicare If I Am Still Working at 65?

Turning 65 usually means becoming eligible for Medicare, but it does not necessarily mean you must enroll in every part of Medicare immediately.

More Americans are continuing to work past 65. Some enjoy their careers, some need the income, and others simply look at retirement and say, “Not quite yet.” If you still have employer health insurance, you may be able to delay Medicare Part B without paying a late enrollment penalty.

The dangerous word in that sentence is may.

Whether you can safely delay Medicare depends on several details, including the size of your employer, whose employment provides the coverage, whether the drug coverage is creditable, and whether you contribute to a Health Savings Account.

Medicare rules are not particularly forgiving. A mistaken assumption can lead to unpaid medical bills, coverage gaps, and penalties that may continue for as long as you have Medicare.

Here is what working adults approaching 65 need to know.

Do I Have to Enroll in Medicare at 65?

You generally become eligible for Medicare at 65. Your first opportunity to enroll is called your Initial Enrollment Period.

This seven-month period includes:

• The three months before the month you turn 65
• The month you turn 65
• The three months after your birthday month

For example, if your birthday is in June, your Initial Enrollment Period generally runs from March through September. Medicare explains the timing and coverage start dates on its official Medicare enrollment page.

However, people who have qualifying health coverage through their own current employment—or their spouse’s current employment—may be able to delay Medicare Part B.

The key phrase is current employment.

Coverage through COBRA, a retiree health plan, or a former employer is not treated the same way.

When Can I Safely Delay Medicare Part B?

You can generally delay Medicare Part B without a late enrollment penalty when all of the following are true:

1. You or your spouse is actively working.
2. You are covered by a group health plan connected to that current employment.
3. The employer coverage qualifies under Medicare’s coordination-of-benefits rules.

Social Security states that a person covered by a group health plan through their own or a spouse’s current employment may qualify for a Special Enrollment Period and may not need to enroll in Part B at 65.

This does not automatically mean delaying Part B is your best financial choice. It simply means you may have the legal right to delay it without being penalized.

Before making the decision, compare:

• Your employer-plan premium
• Deductibles and copayments
• Prescription costs
• Provider networks
• Coverage for your spouse or dependents
• The cost of Medicare plus supplemental coverage

Sometimes the employer plan is the better bargain. Sometimes Medicare offers better coverage for less money. Never assume one is cheaper merely because it comes through an employer.

You can privately compare Medicare options online and review what may be available before changing your current coverage.

Employer Size Can Make a Major Difference

One of the most important questions is:

How many employees does the company have?

Employers With 20 or More Employees

When an employer has 20 or more employees, the employer group health plan is generally the primary payer for a worker or spouse who is 65 or older and covered because of current employment.

Medicare is generally secondary if the person also enrolls in Medicare.

In this situation, you may often delay Part B without a penalty while the employment and qualifying group coverage continue.

Employers With Fewer Than 20 Employees

When an employer has fewer than 20 employees, Medicare is generally the primary payer for a person who is 65 or older, while the employer plan may pay second.

This can create a serious problem if you delay Medicare.

The employer insurance card may still be in your wallet, and the employer may still deduct premiums from your paycheck, but the plan may calculate benefits as though Medicare paid first. If you did not enroll in Medicare, you could be responsible for costs Medicare would have paid.

Medicare’s coordination rules determine which coverage pays first and which pays second. The answer depends on the type of coverage, employment status, employer size, and sometimes the reason for Medicare eligibility.

Ask the employer’s benefits administrator these questions in writing:

• Is this coverage based on current active employment?
• Is the employer plan primary or secondary after I turn 65?
• How many employees are counted under Medicare’s rules?
• Am I required to enroll in Medicare Part A or Part B?
• Will the plan pay claims normally if I do not enroll in Medicare?

Do not settle for, “We think you should be fine.” Medicare penalties and hospital bills are not paid with good intentions.

Can I Delay Medicare Part A?

Many people qualify for premium-free Medicare Part A because they or their spouse paid Medicare taxes for the required amount of time.

Because premium-free Part A provides hospital coverage without a monthly premium, some people enroll in Part A at 65 while delaying Part B.

Medicare says that people who qualify for premium-free Part A may choose to enroll at 65 or later while continuing to work.

However, there is an important exception for people contributing to a Health Savings Account.

The HSA Trap: Medicare and Health Savings Accounts

Once you are enrolled in any part of Medicare, you generally can no longer contribute to an HSA.

You can still use money already in the account for qualified medical expenses. The restriction applies to making new contributions.

The IRS states that your HSA contribution limit becomes zero beginning with the first month you are enrolled in Medicare. This rule also applies to months covered by retroactive Medicare enrollment.

Here is where people get caught:

When someone enrolls in premium-free Part A after age 65, Part A coverage may be made retroactive for as many as six months, but not earlier than the person’s first month of Medicare eligibility.

That retroactive coverage can make recent HSA contributions ineligible.

Someone planning to enroll in Medicare after working past 65 should generally stop HSA contributions far enough in advance to account for possible retroactive Part A coverage. Because tax circumstances differ, coordinate the timing with Social Security, the employer benefits department, and a qualified tax professional.

The basic rule is simple:

Medicare enrollment and HSA contributions do not mix.

What Happens When I Retire or Lose Employer Coverage?

Once the employment ends—or the group coverage based on that employment ends—you generally receive an eight-month Special Enrollment Period to enroll in Medicare Part B.

The eight-month period begins when the employment ends or the employer coverage ends, whichever happens first. You may also enroll in Part B while you are still covered and actively working.

Although you may technically have eight months, waiting that long can cause a coverage gap. Employer coverage may end at the end of the month, while Medicare may not begin until a later date if the enrollment is not coordinated properly.

A better approach is to begin preparing approximately two or three months before retirement.

Confirm:

• The final date of employer coverage
• The requested Medicare Part B start date
• Whether Part A has already started
• How prescription coverage will continue
• Whether you want Medicare Advantage or Original Medicare
• Whether you need a Medicare Supplement and Part D plan

Preparation reduces fear because it removes the last-minute guessing.

COBRA Does Not Protect You From the Part B Penalty

This is one of the most expensive Medicare misunderstandings.

COBRA allows certain workers and family members to temporarily continue employer health coverage after employment ends. However, COBRA is not coverage based on current employment.

Your eight-month Part B Special Enrollment Period generally begins when employment or active employer coverage ends—not when COBRA ends.

Medicare warns that choosing COBRA does not extend the Part B enrollment deadline. If you miss the eight-month period, you may face a coverage gap and a lifetime Part B late enrollment penalty.

COBRA may also expect Medicare to pay first after you become eligible. That could leave you with unpaid claims if you delay Medicare.

Before accepting COBRA at 65 or older, ask how the plan coordinates with Medicare. Do not assume that paying a COBRA premium makes Medicare optional.

Retiree Coverage Is Not Active-Employment Coverage

Retiree insurance can be valuable, but it normally does not give you the same right to delay Part B as insurance based on current employment.

Medicare generally pays first when someone has Medicare and retiree insurance, while the retiree plan pays second.

Some retiree plans require enrollment in Medicare Parts A and B. Others coordinate with Medicare or provide access to a Medicare Advantage or supplemental plan.

Read the plan booklet and speak directly with the retiree benefits administrator before delaying Medicare.

What Is the Part B Late Enrollment Penalty?

When someone delays Part B without qualifying employer coverage, the penalty is generally 10% of the standard Part B premium for each full 12-month period the person could have had Part B but did not enroll.

In most cases, the penalty continues for as long as the person has Part B.

For example, a two-year delay could produce a 20% penalty added to the monthly Part B premium. Medicare’s 2026 example shows a person subject to a 20% penalty paying the standard $202.90 Part B premium plus a $40.58 monthly penalty.

The penalty is unpleasant, but the greater danger may be the coverage gap.

Someone who misses both the Initial Enrollment Period and a qualifying Special Enrollment Period may have to enroll during the General Enrollment Period, which runs from January 1 through March 31. Coverage generally begins the month after enrollment.

Do Not Forget Medicare Part D

Medicare Part D has separate rules for prescription drug coverage.

You may be able to delay Part D if your employer or union prescription coverage is considered creditable coverage. Creditable means the coverage is expected to pay, on average, at least as much as standard Medicare drug coverage.

The employer or plan should provide a creditable-coverage notice each year. Save every notice.

After losing creditable prescription coverage, you generally should not go 63 consecutive days or more without Part D or other creditable drug coverage. Otherwise, you may owe a Part D late enrollment penalty.

The Part D penalty is generally calculated as 1% of the national base beneficiary premium for every full month you went without creditable coverage.

Ask the employer for written confirmation that the drug coverage is creditable. Do not guess based on how generous the plan appears.

How Do I Enroll in Part B After Working Past 65?

When you are ready to leave employer coverage, you can apply for Part B through Social Security.

The traditional process uses two forms:

• CMS-40B: Application for Enrollment in Medicare Part B
• CMS-L564: Request for Employment Information

The CMS-L564 form helps prove that you were covered through current employment and qualify for a Special Enrollment Period. Medicare identifies both forms as part of the enrollment process for people who are still working, recently retired, or recently lost job-based coverage.

Social Security also allows many people to apply for Part B online when employer coverage is ending.

Keep copies of all forms, employer letters, creditable-coverage notices, and submission confirmations.

A Practical Medicare-at-65 Checklist

Before deciding to delay Medicare, complete these steps:

1. Ask whether the employer has 20 or more employees.
2. Confirm that coverage is based on current employment.
3. Ask which plan pays first after age 65.
4. Get written confirmation that prescription coverage is creditable.
5. Compare employer costs with Medicare coverage.
6. Consider the needs of a spouse or dependent.
7. Review HSA contributions before enrolling in Medicare.
8. Save all employer coverage documentation.
9. Begin planning several months before retirement.
10. Do not treat COBRA or retiree coverage as active-employment coverage.

People living in New York, Florida, or North Carolina can also review state-specific Medicare information and available enrollment resources.

The Bottom Line

Yes, you may be able to delay Medicare if you are still working at 65—but working alone is not enough.

You generally need qualifying group health coverage based on your or your spouse’s current employment. Employer size, coordination rules, prescription coverage, COBRA, retiree benefits, and HSA contributions can all affect the decision.

The safest approach is to verify everything before your 65th birthday. Speak with the employer’s benefits administrator, request the answers in writing, and compare your employer insurance with Medicare before making a change.

There is no prize for enrolling in Medicare too early, but there is also no prize for delaying it incorrectly.

Medicare decisions should not be rushed or based on a coworker’s experience. Your circumstances may be different, even if you work for the same company.

At MedicareSelfEnroll.com, you can research and compare Medicare options privately, at your own pace, without pressure. Preparation gives you a larger margin for error—and much greater peace of mind.

This article is for educational purposes and is not legal, tax, or individualized insurance advice. Medicare rules and plan availability may change. Confirm your situation with Social Security, Medicare, your employer benefits administrator, and a qualified professional before delaying enrollment.