Yes, you can cancel Medicare Part B, but the timing and reason matter

You can drop Medicare Part B at any time during the year, though the process differs depending on whether you're still working, have other coverage, or are straightforward choosing to leave the program. The cancellation takes effect on the first day of the month after you request it — so if you call in March, your coverage ends April 1st. However, canceling Part B without a valid reason can trigger a permanent penalty on your premiums if you rejoin later, so understanding when it makes sense to drop it is important before you act.

The most common reasons people cancel Part B are: they have employer health insurance through a current job, they have coverage through a spouse's employer, they're moving out of the country, or they want to rely solely on a Medicare Advantage plan (Part C). If none of these explore to you, dropping Part B usually costs you money in the long run.

Key Takeaways

  • You can cancel Part B by calling Social Security at 1-800-772-1213 or by visiting your local Social Security office in person with your Medicare card.
  • Cancellation takes effect the first day of the month after you request it, and you stop paying the monthly premium when ready.
  • If you drop Part B without employer coverage or other may have access to reasons, you'll owe a penalty of 10 percent per year for every 12 months you were without it when you rejoin.
  • If you have employer coverage and drop Part B, you can rejoin during your employer's open enrollment period without penalty, as long as you enroll within eight months of losing that job coverage.
  • Dropping Part B does not affect Part A (hospital coverage) or your prescription drug plan, though it may affect your Medigap coverage options.

When you can cancel Part B without a penalty

You avoid the permanent penalty if you have a may have access to reason to drop Part B. The main may have access to reasons are: you're still working and covered by your employer's health plan, you're covered by a spouse's employer plan, you're covered by TRICARE (military health coverage), or you're moving permanently outside the United States.

If you have employer coverage and drop Part B, you have a window to rejoin without penalty. You must enroll within eight months after your employer coverage ends or your employment ends, whichever comes first. Social Security calls this the Special Enrollment Period. If you miss this window, the penalty applies.

You also avoid penalty if you drop Part B to switch to a Medicare Advantage plan (Part C). Since Medicare Advantage includes hospital and medical coverage, you don't need Part B running at the same time. However, if you later drop the Advantage plan and want to return to Original Medicare with Part B, you'll need to rejoin Part B during the Annual Enrollment Period (October 15 to December 7 each year) or face a penalty.

The permanent penalty for dropping Part B without a reason

If you cancel Part B and don't have a may have access to reason — meaning you're not working, don't have employer coverage, and aren't moving abroad — you'll owe a Late Enrollment Penalty when you rejoin. The penalty is 10 percent of the standard Part B premium for every 12 months you were without coverage.

The penalty is permanent. It stays on your account for as long as you're enrolled in Part B, even if you later get employer coverage or move. For example, if you drop Part B at age 65 and rejoin at age 72 (seven years later), you'd owe a 70 percent penalty on top of your regular premium. At 2024 rates, the standard Part B premium is around $164.90 per month; a 70 percent penalty would add roughly $115 per month to that cost for life.

The only exception is if you were still covered by employer insurance when you turned 65 and didn't enroll in Part B at that time. In that case, you can enroll within eight months of losing the employer coverage without penalty. But if you actively cancel Part B after enrolling, the penalty clock starts ticking.

How to cancel Part B

You have two main options: call Social Security or visit in person. To cancel by phone, call 1-800-772-1213 (TTY 1-800-325-0778 for deaf and hard of hearing). Have your Medicare card and Social Security number ready. Tell them you want to cancel Part B and explain your reason — they'll ask whether you have other coverage or are moving abroad. The call usually takes 10 to 15 minutes.

To cancel in person, visit your local Social Security office. Bring your Medicare card, Social Security card, and a photo ID. You can find your nearest office at ssa.gov/locator. In-person cancellation creates a paper record, which can be useful if there's ever a dispute about when your coverage ended.

You can also submit a written request by mail. Write a letter stating you want to cancel Part B, include your name, date of birth, Social Security number, and Medicare number, and mail it to your local Social Security office. Include a copy of your Medicare card if possible. Mail takes longer — allow two to three weeks — but it creates a dated record of your request.

After you cancel, you'll receive a confirmation letter from Social Security within two weeks. Keep this letter. It shows the effective date of cancellation and will be important if you need to prove you dropped coverage intentionally.

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

Dropping Part B does not automatically cancel Part A (hospital insurance) or your prescription drug plan (Part D). Part A and Part B are separate, so you can keep Part A active while canceling Part B. This is useful if you have employer coverage for doctor visits but want to keep hospital coverage.

If you have a Medigap policy (supplemental insurance), canceling Part B may affect it. Some Medigap plans require you to be enrolled in both Part A and Part B to keep the policy active. Check your Medigap plan documents or call your insurance company before you cancel Part B to see whether your policy will remain in force. If it lapses, you may not be able to get it back at the same rate later.

If you have a Medicare Advantage plan (Part C), you can drop Part B without affecting it, since Advantage plans include medical coverage. However, if you later drop the Advantage plan and want to return to Original Medicare, you'll need to enroll in Part B again during the Annual Enrollment Period.

Rejoining Part B after you cancel

If you cancel Part B and later want to rejoin, the timing of your request matters. During the Annual Enrollment Period (October 15 to December 7 each year), you can enroll in Part B with no questions asked. Your new coverage starts January 1st of the following year.

If you miss the Annual Enrollment Period and don't have a may have access to reason to enroll outside it, you'll have to wait until the next October. You'll also owe the Late Enrollment Penalty unless you had employer coverage or another may have access to reason when you dropped Part B.

If you have a may have access to reason — such as losing employer coverage — you may be able to enroll during a Special Enrollment Period, which is a window outside the regular enrollment season. You typically have two months from the date you lose employer coverage to enroll in Part B without penalty. Contact Social Security to confirm your specific situation.

Common mistakes to avoid

The biggest mistake is canceling Part B without understanding the penalty. Many people drop it thinking they can rejoin anytime without cost, then face a shock when they try to sign back up years later. If you're unsure whether you have a may have access to reason, call Social Security and ask before you cancel.

Another common error is canceling Part B but forgetting to check what happens to your Medigap or Advantage plan. Some people cancel Part B, lose their supplemental coverage as a result, and then can't get it back at an affordable rate. Always contact your other insurance provider before you cancel.

A third mistake is canceling during the wrong month. If you call in mid-March and ask to cancel, your coverage ends April 1st — you still pay the March premium. If you want coverage to end sooner, you need to call earlier in the month. Plan your cancellation for the first week of the month before the month you want to stop paying.

Frequently Asked Questions

What if I cancel Part B but then change my mind the next month?

If you cancel and then want to rejoin within the same calendar year, you can enroll during the Annual Enrollment Period (October 15 to December 7). If you're outside that window and don't have a may have access to reason, you'll have to wait until the next October. If you had employer coverage when you canceled, you have eight months from losing that coverage to rejoin without penalty.

Can I cancel Part B if I'm on Medicare Advantage?

Yes. Medicare Advantage plans include medical coverage, so you don't need Part B. You can drop Part B without affecting your Advantage plan. However, if you later switch back to Original Medicare, you'll need to enroll in Part B again during the Annual Enrollment Period or face a penalty.

Does canceling Part B affect my Social Security benefits?

No. Part B is health insurance; Social Security retirement benefits are separate. Canceling Part B does not change your Social Security payments or your may be able to access for them.

What if I'm moving to another country?

If you're moving permanently outside the United States, you can cancel Part B without penalty. You'll need to notify Social Security and provide proof of your move, such as a lease or residency document from the new country. Your coverage ends the month after you request cancellation.

Will I owe back premiums if I cancel Part B mid-month?

No. Your cancellation takes effect the first day of the following month, and you stop paying premiums after that. You pay the full premium for the month in which you request cancellation, even if you call on the last day of the month.