You may change your Medicare plan during the open enrollment period (10/15–12/7). If you’ve disenrolled from Medicare Part B, you may reenroll during the Medicare Advantage open enrollment period (1/1–3/31) and the Medicare open enrollment period (10/15–12/7).

Over time, your needs may change and require you to swap Medicare plans. Each year you have up to three opportunities to switch your Medicare coverage and reenroll in original Medicare, which includes Part A and Part B.

Read on to learn more about how to reenroll in Medicare Part B and what it covers.

Enrollment periods for Medicare

  • Medicare Advantage open enrollment — January 1 through March 31. During this period, you can switch from one Medicare Advantage plan to another or go back to original Medicare.
  • Medicare open enrollment period — October 15 through December 7. During this time, you can switch from a Medicare Advantage (Part C) plan back to original Medicare. You can also change Part C plans or add, remove, or change a Medicare Part D (prescription drug) plan.
  • Special enrollment period — 8 months following a qualifying event. If you qualify, you may be granted this 8-month window to reenroll in original Medicare or change your Medicare coverage after a significant life event, such as a divorce or move.
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If you’ve disenrolled from or cancelled your Medicare Part B coverage, you may have to pay a costly late enrollment penalty to reenroll. This is especially true if you have a gap in coverage.

If you’re looking to reenroll in Medicare Part B, follow these steps:

  1. Go to the Social Security Administration website.
  2. Complete the application.
  3. Mail all required documents to the Social Security office. Include all required official or certified documents to allow for a seamless process.

If you are reenrolling in Part B and you already have Part A, you may not be able to enroll online. In that case, the Social Security Administration recommends performing one of the following steps:

  • Apply on the Social Security Administration website, completing and submitting all required forms, along with evidence of your workplace health plan.
  • Fax or mail all required documentation to your local Social Security office.

If you left Medicare Part B and participated in a workplace insurance plan, you may have to prove coverage to avoid paying late enrollment fees. Upon approval, you’ll be granted a special enrollment period. During this time, you can enroll in Medicare Part B without penalty.

If you were disenrolled from your Medicare part B plan for missing premium payments, you have 30 days from the official termination date to repay what’s due. If accepted, your coverage will continue.

If you don’t pay back the premiums within the allotted time, you’ll have to reenroll during the next general enrollment period, which runs from January 1 through March 31 each year. You can also ask for reinstatement under the Medicare Good Cause policy.

If you prove there’s “good cause” (or reason) for not paying premiums — typically an emergency, chronic illness, or other related situation — you’ll still have to pay all owed premiums within a specified period of time to resume coverage.

Medicare has three main enrollment periods:

  • initial enrollment
  • general enrollment period (also called Medicare Advantage open enrollment)
  • special enrollment

The initial enrollment period is a 7-month time frame. It includes:

  • the 3 months before the month you turn 65 years old
  • your birth month
  • 3 months after your birth month

It’s recommended that you enroll during the first 3 months of initial enrollment so your coverage will begin earlier and you’ll avoid delays.

If you do not sign up for Medicare Part B when you’re first eligible, you run the risk of having to pay a late enrollment penalty for as long as you have Part B insurance.

When your initial enrollment period ends, if you haven’t enrolled in Medicare, you may have the opportunity to enroll during a special enrollment period without having to pay a penalty, if approved.

If you’re already covered through a workplace plan, or if you or your spouse suffer from a disability, you can sign up for Part B at any time.

An 8-month special enrollment period to enroll into Part B insurance also comes into play 1 month after your employment or workplace insurance plan ends. You can even qualify for a special enrollment period if you’re a volunteer in another country.

If you miss your initial enrollment and aren’t eligible to sign up during a special enrollment period, you can sign up for Medicare Part B during the general enrollment period. This occurs from January 1 through March 31 each year.

The caveat to this enrollment period is that you may have to pay higher premiums on the plan for late enrollment.

Medicare Part B covers two main types of services:

  • outpatient care that’s medically necessary
  • preventive services

Medically necessary services include those needed to diagnose and treat a medical condition. This can include:

  • annual visits to your healthcare practitioner
  • ambulatory services
  • visits to the emergency room

Preventive services include treatments and screenings to detect and prevent illnesses.

Other services covered under Part B include:

In order to qualify for Medicare Part B, you must satisfy at least one of these main eligibility requirements:

Though you’re unable to use the plan benefits until the day you turn 65 years old, you’re eligible to enroll:

  • 3 months before your 65th birthday
  • on your 65th birthday
  • 3 months after your 65th birthday

You’re also qualified to enroll in Medicare Part B if you have a disability and are receiving Social Security disability payments. This applies even if you’re not 65 years old.

Some of the more common qualifying disabilities include:

  • People 65 years old or over qualify for Medicare coverage.
  • If your workplace participates in a group health plan, however, you have the option to opt out of or disenroll from Medicare plans. This is often the case for Medicare Part B.
  • You can reenroll in a Medicare plan later, but this can result in late enrollment penalty fees and may require proof of other coverage.
  • Before making changes to your insurance plans, make sure you understand the benefits and risks of doing so. While it’s helpful to have options, make sure they best suit your needs.