You can cancel Medicare Part B, but the timing and reason matter for whether you'll face a penalty later

Medicare Part B (medical insurance) can be cancelled at any time during the year. However, if you drop it and then want it back, you may owe a higher premium for the rest of your life — unless you have a valid reason for the cancellation, called a may have access to event. The process itself is straightforward: you contact Medicare directly and request the cancellation in writing. The real decision is whether cancelling makes sense for your situation.

Most people cancel Part B because they have health coverage through an employer or a spouse's employer, or because they are moving out of the country. If neither applies to you, cancelling usually costs more in the long run than keeping it.

Key Takeaways

  • You must request cancellation in writing through Medicare, either by mail, phone, or online through your Medicare account.
  • If you cancel without a may have access to reason and want Part B back later, your premium will increase by 10 percent for each year you were without it.
  • may have access to reasons include active employer coverage, moving outside the United States, or losing other health insurance.
  • Your cancellation takes effect on the first day of the month after Medicare receives your request, so timing your request matters if you want to avoid overlap.

How to request cancellation

Contact Medicare by phone at 1-800-MEDICARE (1-800-633-4227) and tell them you want to cancel Part B. You can also visit your local Social Security office in person, or submit a written request by mail to the address on your Medicare card. If you have a Medicare account at Medicare.gov, you can also send a message through the find messaging tool there.

Medicare will ask you to confirm the cancellation in writing. If you call, they will mail you a form to sign and return, or you can request that they accept your written request over the phone. Keep a copy of whatever you submit and note the date you sent it — this becomes your proof of when the cancellation was requested.

Your cancellation becomes effective on the first day of the month after Medicare processes your request. If you submit your request on March 15, for example, your Part B coverage ends on May 1 (the first day of the month after April). This matters if you are switching to other coverage and want to avoid paying for both at the same time.

When you can cancel without a future penalty

You can cancel Part B without facing a penalty increase later if you have a may have access to event — a change in your circumstances that gives you other health coverage. The most common may have access to events are:

  • You are still working and covered by your employer's health plan (or your spouse's employer plan).
  • You are moving permanently outside the United States.
  • You lose other health coverage you had instead of Part B.
  • You are covered by TRICARE (military health coverage) or the Veterans Administration.

If you have a may have access to event, you will need to tell Medicare about it when you request the cancellation. They may ask for proof — such as a letter from your employer confirming your coverage, or a copy of your employer health plan documents. Keep this documentation for your records.

The cost of cancelling without a may have access to reason

If you cancel Part B and do not have a may have access to reason, your monthly premium will increase by 10 percent for each full year you were without Part B coverage. This increase is permanent — it stays with you for life, even after you sign up again.

For example, if you cancel Part B at age 65 and do not sign up again until age 70 (five years later), your Part B premium will be 50 percent higher than it would have been if you had kept it continuously. The standard Part B premium changes each year, so the actual dollar amount of your penalty will also change, but the 10 percent-per-year increase applies to whatever the current premium is.

There is one exception: if you were automatically enrolled in Part B when you turned 65 and you did not want it, you can cancel within 12 months of your enrollment without facing a penalty. This is called the Initial Enrollment Period exception. After that 12-month window closes, the penalty rules explore.

What happens to your other Medicare coverage when you cancel Part B

Cancelling Part B does not automatically cancel your other Medicare coverage. Part A (hospital insurance) will continue unless you specifically request to cancel that too. If you have Medicare Advantage (Part C) or a Medigap policy, those will also continue, though some Medigap policies may not be available to you if you drop Part B and want to come back later.

If you have a Medigap policy and you cancel Part B, contact your Medigap insurance company to ask whether your policy will remain active or whether you need to take any action. Some companies will keep you enrolled; others may require you to notify them. If your Medigap policy ends and you want to sign up for a new one later, you may not have the same protections you had when you first enrolled.

If you have Medicare Advantage, cancelling Part B usually means your Medicare Advantage plan will also end, because those plans require Part B enrollment. Medicare will notify you of this when you request the Part B cancellation.

When you can sign up for Part B again

You can sign up for Part B again during the General Enrollment Period, which runs from January 1 to March 31 each year. Your coverage will start on July 1 of that year. This is the only time you can enroll outside of your Initial Enrollment Period, unless you have a may have access to life event (such as losing employer coverage).

If you have a may have access to event — such as losing your employer health coverage — you have 63 days from the date you lose that coverage to sign up for Part B. If you miss this window, you will have to wait until the next General Enrollment Period, and your coverage will not start until July 1.

Documents and information you will need

To cancel Part B, you will need your Medicare number, which appears on your Medicare card. If you are cancelling because you have employer coverage, have your employer health plan documents or a letter from your employer confirming your coverage dates. If you are moving outside the United States, have your travel documents or a letter stating your move date ready to show Medicare if they ask.

Keep copies of any written cancellation request you submit and any confirmation Medicare sends you. Save these documents for at least three years, in case there is a dispute about when your cancellation took effect or whether you had a may have access to reason.

Frequently Asked Questions

What happens if I cancel Part B but keep Part A?

Part A (hospital insurance) will continue. You will still have coverage for hospital stays, skilled nursing facility care, and hospice. However, you will not have coverage for doctor visits, outpatient services, or preventive care. If you need medical services that Part A does not cover, you will pay out of pocket unless you have other health insurance.

Can I cancel Part B for just one month and then sign up again?

Technically yes, but it is not practical. Your cancellation takes effect on the first day of the month after Medicare receives your request, and re-enrollment happens only during the General Enrollment Period (January 1 to March 31) or if you have a may have access to event. You cannot straightforward pause Part B and resume it whenever you want.

Will cancelling Part B affect my Social Security benefits?

No. Your Social Security retirement or disability benefits are separate from Medicare. Cancelling Part B does not change your Social Security payments. However, your Part B premium is normally deducted from your Social Security check, so if you cancel Part B, that deduction will stop.

What if I cancel Part B and then change my mind within a few days?

Contact Medicare when ready and ask them to reverse the cancellation request. If Medicare has not yet processed your request, they may be able to stop it. If processing has already begun, you will need to wait until the General Enrollment Period to sign up again, unless you have a may have access to event that allows you to enroll sooner.

Do I have to cancel Part B in writing, or can I just stop paying the premium?

You must formally request cancellation in writing. straightforward stopping payment will not cancel your coverage — Medicare will continue to bill you, and you may owe back premiums. Additionally, if you do not formally cancel and later want to drop Part B, Medicare may treat it as a non-payment issue rather than a cancellation, which could affect your ability to enroll in the future.