You cancel Medicare Part B by sending a signed termination request (usually using form CMS‑1763) to Social Security and having them process the disenrollment, which generally ends coverage the month after your request.

Quick Scoop

Canceling Medicare Part B is possible, but it takes more than just ignoring a bill. Social Security has to process a formal request, and canceling now can make it harder or more expensive to get Part B back later.

Step‑by‑Step: How to Cancel Medicare Part B

1. Decide if canceling really makes sense

Before doing paperwork, think through:

  • Are you switching to other “creditable” coverage (like large employer insurance)?
  • Could you afford higher premiums later if you re‑enroll and owe late penalties?
  • Do you understand that Part B covers most routine doctor visits, tests, and outpatient care?

If you’re unsure, it’s wise to speak with:

  • Your HR/benefits department (if still working)
  • A licensed Medicare broker or SHIP counselor in your state

These people can help you avoid gaps in coverage that might be expensive to fix later.

2. Contact Social Security (you can’t cancel online)

You can’t simply click a button on Medicare.gov to drop Part B. To start:

  • Call Social Security: 1‑800‑772‑1213 (TTY 1‑800‑325‑0778) and say you want to terminate Medicare Part B.
  • Or contact/visit your local Social Security office and ask how to drop Part B.

In many cases, Social Security will:

  • Schedule a short interview (by phone or in person)
  • Explain the consequences, including late penalties and re‑enrollment limits
  • Help you complete the needed form (CMS‑1763)

This interview step exists to be sure you really understand what you’re giving up before they finalize the cancellation.

3. Fill out the CMS‑1763 termination form

The key document is:

  • Form CMS‑1763: Request for Termination of Premium Hospital and/or Supplementary Medical Insurance.

Important points:

  • The form asks which coverage you’re terminating (Part B, or also premium Part A if you have it).
  • You must sign and date it; unsigned forms won’t be processed.
  • Often, Social Security provides or completes this form with you during the interview rather than making you find it yourself.

Once completed, Social Security typically asks you to:

  • Mail or fax the signed CMS‑1763 to the address/fax they provide.

4. Send back (or update) your Medicare card

If you are:

  • Keeping Part A but dropping Part B: you’ll usually be asked to send back your current red‑white‑and‑blue Medicare card.
  • Medicare will then send you a new card showing Part A only.

Before mailing the card, note your Medicare number so you have it handy for any future care or questions.

5. When your Part B actually ends

Your Part B doesn’t stop the day you mail the form. Typically:

  • Coverage ends at the end of the month after the month you file the request.
  • Example: File your cancellation on March 10 → Part B ends April 30.

You are responsible for Part B premiums for every month you still have coverage, up to that official end date.

If you change your mind before that end date:

  • Contact Social Security immediately; they may be able to stop the termination if it hasn’t fully processed yet.

What About Penalties, Re‑Enrollment, and Risks?

No penalty to cancel now, but…

  • There is no direct “cancellation penalty” just for dropping Part B.
  • However, if you later decide to re‑enroll, you may face a late enrollment penalty if you did not have creditable coverage in between.

The late enrollment penalty:

  • Is typically 10% extra added to your Part B premium for each full 12‑month period you were eligible but not enrolled and without creditable coverage.
  • Usually lasts as long as you have Part B.

This is why many people keep Part B unless they have strong, stable coverage elsewhere (for example, large employer insurance).

When can you re‑enroll later?

If you cancel and want back in:

  • You typically have to wait for the General Enrollment Period (January 1 – March 31) to re‑enroll in Part B unless you qualify for a Special Enrollment Period (like losing employer coverage).
  • Your coverage may not start until July 1 of that year if you re‑enroll during General Enrollment.

This gap can leave you paying out‑of‑pocket for doctor visits and outpatient care for months, which is why the decision to drop Part B is treated as a big one.

Special Situations & Forum Talk Flavor

Recent forum discussions show people considering canceling Part B when:

  • They’re still working and covered by a large employer plan.
  • They rarely go to the doctor and feel they “never use it.”
  • The monthly premium (over $170 in recent years for many) feels like too much on a fixed income.

Common themes from those real‑world stories:

  • Some regret dropping Part B after one big medical event wipes out their savings.
  • Others are happy they coordinated the switch with employer coverage and avoided gaps.
  • Many underestimate how tricky timing and penalties can be without talking to an expert first.

“I thought I’d save money by canceling B, but trying to get back in later was way more stressful and expensive than I expected.”

If your situation is complicated (retiree coverage, COBRA, TRICARE, union plans, etc.), talking through your options with a Medicare specialist or SHIP counselor is strongly recommended.

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