Is Medicare Mandatory?

Medicare isn’t mandatory, but disenrolling from the program is complicated, and there are consequences for terminating coverage. You may face lifetime penalties if you delay signing up for Medicare at age 65 and try to enroll later.

Rachel Christian, writer and researcher for RetireGuide
  • Written by
    Rachel Christian

    Rachel Christian

    Financial Writer and Certified Educator in Personal Finance

    Rachel Christian is a writer and researcher for RetireGuide. She covers annuities, Medicare, life insurance and other important retirement topics. Rachel is a member of the Association for Financial Counseling & Planning Education.

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  • Edited By
    Lee Williams
    Lee Williams, senior editor for

    Lee Williams

    Senior Financial Editor

    Lee Williams is a professional writer, editor and content strategist with 10 years of professional experience working for global and nationally recognized brands. He has contributed to Forbes, The Huffington Post, SUCCESS Magazine,, Electric Literature and The Wall Street Journal. His career also includes ghostwriting for Fortune 500 CEOs and published authors.

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  • Reviewed By
    Aflak Chowdhury
    Aflak Chowdhury

    Aflak Chowdhury

    Medicare Expert

    Aflak Chowdhury is a Medicare expert and independent insurance broker specializing in group health insurance. He has worked for major providers including Humana and Principal Financial Group and today works mainly in the small group market.

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  • Published: June 15, 2021
  • Updated: October 19, 2023
  • 8 min read time
  • This page features 14 Cited Research Articles
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A licensed insurance professional reviewed this page for accuracy and compliance with the CMS Medicare Communications and Marketing Guidelines (MCMGs) and Medicare Advantage (MA/MAPD) and/or Medicare Prescription Drug Plans (PDP) carriers’ guidelines.

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How to Cite's Article

APA Christian, R. (2023, October 19). Is Medicare Mandatory? Retrieved June 16, 2024, from

MLA Christian, Rachel. "Is Medicare Mandatory?", 19 Oct 2023,

Chicago Christian, Rachel. "Is Medicare Mandatory?" Last modified October 19, 2023.

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Is it Mandatory to Sign Up for Medicare?

While signing up for Medicare isn’t technically required, there are serious financial penalties and consequences for delaying or forfeiting coverage.

Most people sign up for Medicare or are automatically enrolled in the program around their 65th birthday. This is known as your initial enrollment period, and it begins three months before you turn 65, includes your birth month and extends three months after that.

But what if you want to delay Medicare until later — or refuse it completely?

If you are new to Medicare and receive group health insurance through your employer or your spouse’s employer — and that employer has at least 20 employees — you can delay Medicare enrollment without facing penalties.

You can voluntarily disenroll from Medicare Part A and Part B by completing and mailing a form to the Social Security Administration.

Is Medicare Part A Mandatory?

You can’t refuse or postpone Medicare Part A if you already receive Social Security benefits — unless you’re willing to forfeit your Social Security checks forever.

The U.S. Centers for Medicare & Medicaid Services strongly recommends signing up for Medicare Part A hospital insurance when you’re first eligible at 65, even if you have health insurance from an employer or union.

That’s because most people paid Medicare taxes during their career, and therefore don’t owe a monthly premium for Part A. It’s free coverage essentially.

However, you may want to delay Medicare Part A if you’re required to pay a premium. While most people get Medicare Part A premium-free, it costs up to $505 per month in 2024 for people with fewer than 10 years of work history.

You may also consider postponing enrollment if you’re still contributing to a health savings account. Once you enroll in any part of Medicare, you can no longer fund an HSA.

If you’re eligible for premium-free Part A, there’s no penalty for delaying Part A, and you can enroll any time after you’re first eligible for Medicare.

Is Medicare Part B Mandatory?

There are limited situations that allow you to delay enrolling in Part B.

If you’re actively working and receive group health insurance through an employer — or your spouse’s employer — you may be able to delay signing up for Part B without paying late enrollment penalties.

Your employer must have at least 20 employees and provide you with qualifying coverage. Otherwise, you’ll likely face a penalty when your workplace coverage ends and you sign up for Medicare.

You should start your Part B coverage as soon as you stop working or your current employer coverage ends — whichever comes first.

Most people with Tricare who enroll in Medicare Part A must also enroll in Part B in order to keep their Tricare benefits.

You can keep your Tricare benefits without enrolling in Part B if:
  • You are an active-duty service member.
  • You are an active-duty family member.
  • You are enrolled in Tricare Reserve Select, Tricare Retired Reserve, Tricare Young Adult or the US Family Health Plan.

You can voluntarily terminate your Part B coverage by filling out Form CMS-1763 and submitting a written request to the Social Security Administration.

Have you selected your 2024 Medicare plan?
Maximize your Medicare savings by connecting with a licensed insurance agent. Annual Enrollment is open until December 7th.

Is Medicare Part C Mandatory?

Signing up for Medicare Part C, better known as Medicare Advantage, is never mandatory.

Medicare Advantage plans serve as an alternative to Original Medicare (Part A and Part B). These plans are administered by private health insurance companies that contract with the federal government.

Plans must provide the same level of care as Original Medicare but may also bundle other benefits into a single plan, such as prescription drug, dental and vision care.

Is Medicare Part D Mandatory?

Medicare Part D isn’t mandatory, but there are penalties for signing up late.

You can receive these benefits through either a standalone Part D plan or a Medicare Advantage plan with prescription drug coverage. Each Medicare drug plan can vary in cost and specific drugs covered.

If you decide not to get Part D coverage when you’re first eligible, and you don’t have creditable employer or union coverage, you’ll likely pay a late enrollment penalty if you join a plan later.

Typically, you’ll pay this penalty for as long as you have Medicare drug coverage.

You have 63 days to enroll in Medicare drug coverage after your creditable employer health insurance ends, or you’ll face a penalty.

It’s important to note that people in the low-income Extra Help program don’t pay the Part D late enrollment penalty.

Read Our New to Medicare Checklist

How to Defer Medicare

In most cases, you or your spouse must be actively working for an employer that provides your current health insurance in order to delay Medicare enrollment and qualify for a special enrollment period later.

Keep in mind that COBRA and retiree benefits from a current or former employer do not count as active creditable coverage.

You can defer Medicare enrollment until your workplace health insurance ends or you leave your job — whichever comes first.

When your workplace coverage stops, you’ll qualify for a special enrollment period of up to eight months when you can sign up for Medicare Part B without facing late enrollment penalties.

There are other times you can change your Medicare coverage, too, including during the general enrollment period and open enrollment period — but you may face a penalty if you wait until one of these enrollment periods.

It’s best to speak with your workplace benefits administrator if you’re still working and want to delay Medicare until retirement.

Your workplace human resources department can help you determine whether your current health insurance qualifies as creditable coverage and if it makes sense to defer Medicare enrollment at 65.

There is another limited situation when you can delay signing up for Medicare Part A and/or Part B. If you live overseas when you turn 65 and don’t qualify for premium-free Part A, you’ll have two months to sign up for Medicare once you return to the United States.

Veterans who receive VA benefits or Tricare should still sign up for Medicare when they’re first eligible.

VA benefits and Tricare aren’t considered active employer insurance, so if you don’t sign up for Medicare at 65, you’ll owe a penalty later. The Department of Veterans Affairs strongly recommends veterans enroll in Medicare when they turn 65.

Read Our Medicare & Veterans Guide

Medicare Penalties for Not Enrolling

Before you decide to postpone enrollment in any part of Medicare, it’s important to understand the late enrollment penalties and limitations that can apply in the future.

Medicare Late Enrollment Penalties
Part A
If you have to buy Part A and you don't sign up when you're first eligible for Medicare, your monthly premium can increase by 10 percent. You'll owe this higher premium for twice the number of years that you didn't sign up.
Part B
The Part B late enrollment penalty increases your monthly premium up to 10 percent for each 12-month period you could've had Part B but didn't sign up. In most cases, you're required to pay this penalty for as long as you have Part B.
Part D
Medicare calculates the Part D penalty by multiplying 1 percent of the national base beneficiary premium — $33.37 in 2022 — by the number of full months you didn't have Part D or creditable coverage. You will pay the penalty as long as you have Medicare drug coverage.

Typically, you can avoid penalties if you delay enrollment because you (or your spouse) are still working and receive creditable health insurance from an employer health plan.

Can You Decline Medicare Coverage?

Under federal law, a Medicare enrollee can voluntarily terminate Part B. You can also terminate Part A if you are required to pay a premium for coverage.

You must complete Form CMS-1763 and file a written request with the Social Security Administration to terminate your benefits.

Did You Know?
Approximately 114,215 beneficiaries each year request termination of their Medicare coverage using Form CMS-1763.

The form takes about five minutes to complete, and you will be required to provide a reason for terminating coverage.

You will also be required to undergo an in-person or telephone interview with a Social Security Administration representative before your request is processed.

If you change your mind and decide you want to keep your Part A insurance, you can do so by filling out this form and mailing it to the Social Security Administration.

To find out more about how to terminate Medicare or to schedule a personal interview with the Social Security Administration, call 1-800-772-1213 or contact your nearest Social Security office.

Last Modified: October 19, 2023

14 Cited Research Articles

  1. Centers for U.S. Medicare & Medicaid Services. (2023, October 12). 2024 Medicare Parts A & B Premiums and Deductibles. Retrieved from
  2. U.S. Centers for Medicare & Medicaid Services. (2022, September 27). 2023 Medicare Parts A & B Premiums and Deductibles 2023 Medicare Part D Income-Related Monthly Adjustment Amounts. Retrieved from
  3. Social Security Administration. (2020, December 3). How do I terminate my Medicare Part B (medical insurance)? Retrieved from
  4. Department of Veterans Affairs. (2020, April 20). VA health care and other insurance. Retrieved from
  5. O’Brien, S. (2020, February 11). How to delay or ditch Medicare and pick it up later without paying penalties. Retrieved from
  6. AARP. (n.d.). Do I have to enroll in Medicare if I continue to have health coverage after age 65 from my own or my spouse’s employer? Retrieved from
  7. AARP. (n.d.). How much is the late enrollment penalty for Medicare Part A? Retrieved from
  8. Centers for Medicare & Medicaid Services. (n.d.). Deciding Whether to Enroll in Medicare Part A and Part B When You Turn 65. Retrieved from
  9. (n.d.). How to get prescription drug coverage. Retrieved from
  10. (2022). Avoid Late Enrollment Penalties. Retrieved from
  11. (n.d.). Part A late enrollment penalty. Retrieved from
  12. (n.d.). Part B late enrollment penalty. Retrieved from
  13. (n.d.). Part D late enrollment penalty. Retrieved from
  14. (n.d.). Should I get Parts A & B? Retrieved from