What Happens If I Miss Medicare Enrollment?

Missing a Medicare enrollment period can have several consequences.

Depending on your situation, you could experience:

This is why Medicare enrollment should be planned before your existing insurance ends.

Medicare Part B Late Enrollment Penalty

If you do not enroll in Part B when first eligible and you do not qualify for a Special Enrollment Period, your monthly Part B premium may increase.

Generally, the penalty is:

10% for each full 12-month period you could have had Part B but did not enroll.

In most cases, the penalty remains for as long as you have Part B.

For example:

If someone delayed Part B for two full years without qualifying employer coverage or another applicable exception, the person could generally face a 20% Part B late enrollment penalty.

This is not simply a one-time fine.





Medicare Part D Late Enrollment Penalty

A Part D penalty may apply if, after becoming eligible for Medicare drug coverage, you go 63 consecutive days or more without:

The penalty generally equals 1% of the national base beneficiary premium for each full uncovered month.

The national base beneficiary premium can change annually, meaning the dollar value of the penalty may also change.

The penalty generally continues for as long as you have Medicare drug coverage.


Part A Late Enrollment Penalty

Most beneficiaries qualify for premium-free Part A and therefore do not encounter a Part A late enrollment penalty.

However, people who must purchase Part A can face a late enrollment penalty if they fail to enroll when required and do not qualify for an exception.

The rules for premium Part A differ from the Part B rules, so people who do not qualify for premium-free Part A should obtain individualized guidance.


What Is the Medicare General Enrollment Period?

If you missed your Initial Enrollment Period and do not qualify for a Special Enrollment Period, you may be able to enroll in Medicare Part B during the:

General Enrollment Period

which runs each year from:

January 1 through March 31

Coverage generally begins the month after you enroll.A late enrollment penalty may still apply.

Could Missing Medicare Enrollment Affect Medigap?

Yes.

Medicare Part B enrollment can also affect your Medigap rights.

Your federal six-month Medigap Open Enrollment Period generally begins when you are:

During that period, federal protections prevent Medigap insurers from denying you a policy because of your health history.

After the period ends, depending on your state and circumstances:

Certain guaranteed-issue protections and state-specific rules can apply.


Medicare Enrollment: Common Mistakes to Avoid

Mistake #1: "Medicare automatically starts when I turn 65."

Not always.

If you are not already receiving Social Security benefits, you may need to actively enroll.

Mistake #2: "I'm still working, so I don't need Medicare."

Maybe—but not necessarily.

Your employer size and type of coverage matter.

Mistake #3: "I have COBRA, so I can wait to enroll in Part B."

COBRA generally does not extend your Medicare Part B Special Enrollment Period based on current employment.

Mistake #4: "I have prescription insurance, so I don't need Part D."

The important question is whether your existing drug coverage is creditable.

Mistake #5: "I'll start Medicare when I start Social Security."

Medicare enrollment and Social Security retirement benefits are separate decisions.

You can enroll in Medicare without claiming Social Security.

Mistake #6: "I can always buy a Medicare Supplement later."

Possibly, but it may not be guaranteed.

Your one-time federal Medigap Open Enrollment Period deserves careful consideration.

Mistake #7: "I'll sign up for Part A because it's free and keep contributing to my HSA."

Be careful.

Enrollment in Medicare generally prevents additional HSA contributions, and delayed premium-free Part A can become retroactive.





A Simple Medicare Decision Tree

If you are approaching age 65, start with these questions:

Are you receiving Social Security already?

Yes: You may be automatically enrolled in Part A and Part B.

No: Determine whether you need to actively apply.


Are you or your spouse still actively working?

No: You will generally want to evaluate Medicare enrollment during your Initial Enrollment Period.

Yes: Continue.


Is your health insurance based on that current employment?

No: Do not assume you can delay Medicare.

Yes: Continue.


Does the employer have 20 or more employees?

Generally yes: The employer plan may pay first, and delaying Part B may be possible.

Generally fewer than 20: Medicare generally pays first, making timely Medicare enrollment particularly important.


Do you contribute to an HSA?

If yes, coordinate Medicare Part A enrollment carefully because HSA contributions generally cannot continue after Medicare begins.


Is your employer prescription coverage creditable?

Get written confirmation and keep your Notice of Creditable Coverage.


When employer coverage ends:

Coordinate Part B, prescription coverage, and your Medicare coverage choice before the employer plan terminates whenever possible.


Frequently Asked Questions

Is Medicare free?

No.

Although many beneficiaries qualify for premium-free Part A, Medicare can still involve:

Do I have to enroll in Medicare at 65?

Many people should, but some people with qualifying current-employer coverage may be able to delay all or part of Medicare.

Your decision should be based on your specific coverage—not simply your age or employment status.

Can I have Medicare and employer insurance at the same time?

Yes.

Which coverage pays first depends on your individual circumstances, including employer size and whether coverage is based on current employment.

Can I enroll in Medicare without retiring?

Yes.

Medicare does not require you to retire.

Can I enroll in Medicare without taking Social Security?

Yes.

You can apply for Medicare without beginning Social Security retirement benefits.

Does Medicare cover everything?

No.

Medicare has coverage limitations, exclusions, deductibles, coinsurance, and other cost-sharing.

Original Medicare generally does not cover certain services such as routine dental care, routine eye exams for glasses, hearing aids, long-term custodial care, and most healthcare received outside the United States, although specific exceptions and other coverage options may apply.