You can cancel Medicare, but the process and consequences depend on which part you have and why you want to leave

Medicare cancellation is not the same as declining it in the first place. If you are already enrolled, you can drop Part A, Part B, or both — but you will lose coverage when ready, and rejoining later may cost you more. If you have Part D (prescription drug) or a Medicare Advantage plan, those have their own cancellation rules and important date. The steps you take depend on which coverage you want to end and whether you have other insurance lined up.

Most people who want to cancel Medicare are either moving to employer coverage, retiring abroad, or switching to a different plan type. Each situation has different rules about when you can cancel and what penalties explore if you rejoin later. Understanding your specific reason matters, because the wrong move can leave you uninsured or facing surcharges for months.

Key Takeaways

  • You can cancel Part A and Part B by contacting Social Security, but you lose coverage the month after you request it.
  • Cancelling Part B triggers a lifetime surcharge (Income-Related Monthly Adjustment Amount, or IRMAA) if you rejoin later without may have access to for a Special Enrollment Period.
  • Medicare Advantage and Part D plans have annual open enrollment windows (October 15 to December 7) when you can switch or drop coverage without penalty.
  • If you have employer coverage or are moving abroad, you may may have access to for a Special Enrollment Period that lets you cancel without surcharges.
  • You must act before the end of the month to cancel coverage effective the following month.

Cancelling Part A and Part B through Social Security

To cancel Original Medicare (Part A and Part B), you contact Social Security directly — not Medicare. You can call Social Security at 1-800-772-1213, visit your local Social Security office, or mail a signed request. Social Security will ask which parts you want to cancel and when you want the cancellation to take effect. The cancellation becomes effective on the first day of the month after you request it, so if you call on March 15, your coverage ends April 1.

You will need to provide your Medicare number (on your red, white, and blue Medicare card) and confirm your identity. Social Security will send you a written confirmation of the cancellation. Keep this letter, because you will need it if you rejoin Medicare later and want to prove you cancelled voluntarily — that matters for whether you owe surcharges.

Once cancelled, you have no Part A or Part B coverage. If you go to a hospital or see a doctor, you will be billed in full. This is why most people only cancel if they have other insurance in place, such as employer coverage or a spouse's plan.

Understanding Part B surcharges if you cancel and rejoin

If you cancel Part B and rejoin later without a valid reason, Medicare charges you a permanent surcharge called the Part B Late Enrollment Penalty. The surcharge is 10 percent of the standard Part B premium for each full year you were not enrolled after you first became may be able to access. If you were supposed to join at 65 and did not join until 72, that is seven years of penalties — and the surcharge stays on your bill for life.

However, you can avoid this surcharge if you have a Special Enrollment Period — a window of time when you can cancel or rejoin without penalty. You may have access to for a Special Enrollment Period if you lose employer coverage, move out of the country, or have other specific life changes. If you cancel because you are moving to employer coverage, you have eight months from the date you lose that coverage to rejoin Medicare without owing surcharges. You must be able to prove you had that employer coverage, so keep your insurance cards and termination letters.

Part A does not have the same surcharge, but if you cancel and rejoin, you may have a waiting period or lose credit for the months you were not enrolled. The rules are complex, so if you think you might rejoin later, ask Social Security about your specific situation before you cancel.

Cancelling Medicare Advantage or Part D plans

If you have a Medicare Advantage plan (Part C) or Part D prescription drug coverage, you do not cancel through Social Security. Instead, you contact your insurance company directly or use the Medicare website. These plans have an Annual Enrollment Period from October 15 to December 7 each year, when you can drop your plan or switch to a different one without penalty.

Outside the Annual Enrollment Period, you can only cancel if you have a may have access to event — you move out of the plan's service area, lose other coverage, or have another life change that Medicare recognizes. If you try to cancel outside these windows without a may have access to event, your request will be denied.

If you have a Medicare Advantage plan and want to switch back to Original Medicare (Part A and Part B), you can do that during Annual Enrollment. Your Advantage plan ends on December 31, and Original Medicare coverage begins January 1. You can also join a Part D plan at the same time if you want prescription drug coverage. This switch does not trigger surcharges, because you are moving between Medicare plan types, not leaving Medicare entirely.

Cancelling Medicare because you have employer coverage

If you are still working and have employer health insurance, you may not need Medicare. You can cancel Part B while keeping Part A, or cancel both. However, you must be careful about the timing and the paperwork, because the rules about surcharges depend on whether your employer coverage counts as "creditable coverage" under Medicare rules.

Before you cancel, contact your employer's benefits office and ask whether your coverage is creditable. If it is, you have eight months after you lose that coverage to rejoin Part B without owing surcharges. If it is not creditable, you may owe surcharges even if you rejoin within eight months. Your employer should be able to tell you, or you can ask Medicare by calling 1-800-MEDICARE.

When you do cancel, get a letter from your employer stating the dates you had coverage. This letter is your proof of the Special Enrollment Period. Keep it with your tax returns and insurance records, because you will need it if you rejoin Medicare later and Medicare questions whether you owe surcharges.

Cancelling Medicare if you move outside the United States

If you move abroad permanently or for an extended stay, you can cancel Medicare. Part A and Part B do not cover care outside the U.S., except in limited situations (Canada, Mexico, and some cases involving U.S. ships). If you are moving abroad and will not need U.S. coverage, cancelling makes sense.

To cancel for this reason, contact Social Security and explain that you are moving outside the U.S. This qualifies you for a Special Enrollment Period, which means you can rejoin without surcharges if you move back. You will need to provide proof of your move — a lease, utility bill, or residency document from your new country. Keep this proof, because you will need it to show Medicare that your cancellation was due to relocation, not just a gap in coverage.

If you think you might return to the U.S. within a few years, consider keeping Part A even if you cancel Part B. Part A has no monthly premium if you have 40 quarters of work history, so it costs nothing to keep active. If you return and rejoin Part B, having Part A already in place simplifies the process.

What happens after you cancel: coverage gaps and re-enrollment

Once your cancellation takes effect, you have no Medicare coverage for that part. If you need medical care, you will be billed at full rates. Some people bridge this gap with private insurance, employer coverage, or a spouse's plan. Others go uninsured temporarily if they expect to rejoin soon.

If you rejoin Medicare later, the effective date depends on when you submit your request. If you rejoin during the Annual Enrollment Period (January 1 to March 31), your coverage starts July 1. If you rejoin outside this window and do not have a may have access to reason, you may have to wait until the next Annual Enrollment Period. This is why timing matters: if you cancel in March and want to rejoin in May, you may not be able to until the following January.

When you rejoin, you will owe any surcharges that explore, and your premiums will be recalculated based on your income at the time of re-enrollment. If your income has changed, your premiums may be higher or lower than before.

Common mistakes to avoid when cancelling Medicare

The biggest mistake is cancelling without having other coverage in place. If you cancel Part B and then lose your employer insurance before you rejoin, you will owe surcharges for the gap. Always confirm your new coverage is active before your Medicare cancellation takes effect.

Another mistake is not getting written confirmation of the cancellation. If Social Security loses your request or processes it incorrectly, you could end up with unwanted coverage and bills. Always ask for a confirmation letter and keep it.

A third mistake is cancelling Part B but forgetting about Part D. If you have a Part D plan and cancel Part B, your Part D plan usually ends too. If you rejoin Part B later without rejoining Part D at the same time, you will owe a surcharge on Part D premiums for each month you were without coverage. During your re-enrollment, make sure to add Part D back if you want it.

Finally, do not assume you can rejoin anytime. Outside the Annual Enrollment Period and without a may have access to event, you may have to wait months to rejoin. If you think there is any chance you will want Medicare again, ask about your options before you cancel.

Frequently Asked Questions

Can I cancel just Part B and keep Part A?

Yes. You can cancel Part B alone and keep Part A, or cancel both. Part A has no monthly premium if you have 40 quarters of work history, so many people keep it even if they cancel Part B. When you cancel, tell Social Security which parts you want to end.

What if I cancel Medicare and then change my mind?

You can rejoin during the Annual Enrollment Period (January 1 to March 31) with coverage starting July 1. If you do not have a may have access to event and miss this window, you may have to wait until the next year. If you had a may have access to event (like losing employer coverage), you have a Special Enrollment Period to rejoin without waiting.

Do I owe surcharges if I cancel Medicare Advantage?

No. Cancelling a Medicare Advantage plan during Annual Enrollment (October 15 to December 7) does not trigger surcharges. If you switch back to Original Medicare at the same time, there are no penalties. Surcharges only explore if you cancel Original Medicare Part B and rejoin later without a may have access to reason.

What if my employer says my coverage is not creditable?

If your employer coverage is not creditable, you should not cancel Part B. If you do and then lose the employer coverage, you will owe surcharges when you rejoin Medicare. If you are unsure, call Medicare at 1-800-MEDICARE and ask them to review your employer's coverage before you cancel.

Can I cancel Medicare if I am on Medicaid?

You can cancel Medicare, but Medicaid does not replace it. If you cancel and lose Medicaid coverage later, you will have no insurance. Most people keep Medicare even if they have Medicaid, because Medicare is primary and covers things Medicaid does not. Talk to your Medicaid caseworker before you cancel.