• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
Medicare

Who is eligible for Medicare? Experts explain the rules, including who may be able to get benefits before 65

By
Margie Zable Fisher
Margie Zable Fisher
Down Arrow Button Icon
By
Margie Zable Fisher
Margie Zable Fisher
Down Arrow Button Icon
September 25, 2023, 12:22 PM ET
Getty Images

Medicare is federal health insurance for people 65 and older, as well as some individuals under 65 with disabilities or specific conditions.

Recommended Video

Medicare has several parts that provide different types of coverage. Part A covers hospitals, skilled nursing facilities, and hospice; Part B covers doctor visits, lab tests, and medical equipment; and Part D covers prescription drugs. Medicare Part C, also known as Medicare Advantage, is actually an alternative insurance to Medicare offered by private insurers.

In order to qualify for any or all parts of Medicare, you must be a U.S. citizen or a permanent resident who has lived continually in the U.S. for the five years immediately preceding application for Medicare, and in one of these categories:

  • Age 65 or older
  • Age 18 or older who have received Social Security disability benefits for at least two years
  • Age 18 or older who have Railroad Retirement benefits or Railroad Retirement disability benefits
  • Those with end-stage renal disease (ESRD) and amyotrophic lateral sclerosis (ALS, also known as Lou Gehrig’s disease)

Part A coverage is free if you (or another qualifying person, like your current or former spouse) paid Medicare taxes while working (generally at least 10 years). If you are 65 or older and can’t meet the tax minimum requirements, you may still be able to purchase Part A.

Do you automatically get enrolled in Medicare if you receive Social Security benefits?

“If you are receiving Social Security retirement, disability benefits, or Railroad Retirement checks, you are automatically entitled to and enrolled in Medicare Part A and Part B. Because Part B is voluntary, you can decline it, but there can be serious consequences, ”says Kata M. Kertesz, a senior policy attorney for the Center for Medicare Advocacy, a national, nonprofit law organization. When you are automatically enrolled, you will be able to receive Medicare benefits the first day of the first month that you turn 65, she says.

Individuals who are 65 years of age and are not receiving Social Security benefits may still enroll in Medicare but must file an application, says Kertesz. As the full retirement age for Social Security is gradually increasing to 67, this is an important point. Every year more people reaching age 65 must apply for Medicare because they are not yet receiving Social Security benefits.

When to apply for Medicare

If you’re not yet receiving Social Security or Railroad Retirement benefits, you must enroll in Parts A and B during an initial enrollment period, which begins in the third month before you reach age 65.

When you enroll during the three months prior to turning 65, Medicare coverage will begin the first day of the first month when you turn 65. If you enroll in Medicare the month you turn 65, or in any of the initial three months after turning 65, coverage will begin the first day of the following month.

If you miss enrolling in Part B during your initial enrollment period, you must wait for a general enrollment period to enter Medicare Part B. The general enrollment period (GEP) is the first three months of each calendar year (January 1 through March 31). 

When to apply for Medicare Part C (Medicare Advantage)

As a Medicare beneficiary, you have the option to receive Medicare coverage through a participating private Medicare Advantage (MA) plan. These plans must offer the services currently available under Medicare Parts A and B. Some plans offer additional benefits, including prescription drug coverage, vision, and limited dental.

In order to enroll in an MA plan, you must first enroll in Medicare Parts A and Part B. You can enroll in an MA plan right after you get Part B coverage, during the annual coordinated enrollment period (ACEP), October 15 through December 7 of each year, or switch MA plans, or return to traditional Medicare during the Medicare Advantage open enrollment period from January 1 to March 31. 

When to apply for Medicare Part D (prescription benefit)

You can enroll in Medicare Part D at the same time you enroll in Medicare Part B. You can also enroll during the ACEP.

What are the penalties for late enrollment?

Enrolling in Medicare after the stated enrollment period has significant ramifications.

Financial penalties can apply to those who enroll late in Medicare Parts A, B, and D, says Kertesz.

Individuals may also miss out on coverage, and be forced to pay out-of-pocket medical expenses.

Do you need to sign up for Medicare when you turn 65 if you’re still working and have health insurance from your job?

With more people working past age 65, this is something you may need to consider.

The rules vary depending on the number of employees at your company.

If you’re still working at a job with more than 20 employees after you turn 65, you can sign up for Medicare Part B when you (or your spouse) stop working and/or lose health insurance, if that happens first. You won’t pay a penalty for late enrollment. If you meet the requirements to get Medicare Part A without a premium, you can sign up for Part A when you turn 65 or anytime after that. Your job-based insurance pays healthcare expenses first, and Medicare pays second.

If you’re still working at a job with less than 20 employees after you turn 65, you can sign up for Medicare Part B when you (or your spouse) stop working and/or lose health insurance, if that happens first. You won’t pay a penalty for late enrollment. However, you should ask your employer about health insurance coverage. If you don’t sign up for Part A and Part B when you turn 65, your job-based health insurance might not cover your health care costs. If you choose to sign up for Medicare and keep your job-based insurance, Medicare pays for health care expenses first, and your job-based insurance pays second.

Who is eligible for Medicaid and other low-income plans?

Medicaid is administered by states and offers additional health coverage to those already enrolled in Medicare who qualify. To qualify for Medicaid benefits, Medicare beneficiaries must meet eligibility criteria based on both financial and non-financial requirements and varies by state.

Additional programs administered by state Medicaid agencies offer financial assistance to low-income Medicare recipients. These include Medicare Savings Programs (MSPs), with eligibility requirements that vary by state. Medicare Extra Help can also help with prescription drug costs.

Join us at the Fortune Workplace Innovation Summit May 19–20, 2026, in Atlanta. The next era of workplace innovation is here—and the old playbook is being rewritten. At this exclusive, high-energy event, the world’s most innovative leaders will convene to explore how AI, humanity, and strategy converge to redefine, again, the future of work. Register now.
About the Author
By Margie Zable Fisher
See full bioRight Arrow Button Icon

Latest in

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
Fortune Secondary Logo
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in

sam altman
AIOpenAI
Sam Altman tells staff at an all-hands that OpenAI is negotiating a deal with the Pentagon, after Trump orders the end of Anthropic contracts
By Sharon GoldmanFebruary 27, 2026
7 hours ago
Future of Workthe future of work
Have good taste? It may just get you a job during the AI jobs apocalypse, says Sam Altman
By Marco Quiroz-GutierrezFebruary 27, 2026
8 hours ago
CybersecurityMeta
Trump’s FTC backs off social media regulation despite finding that nearly 20% of America’s children are online for 4 hours or more
By Catherina GioinoFebruary 27, 2026
8 hours ago
Emil Michael smirks
AIAnthropic
Emil Michael, the Silicon Valley exec turned Trump official leading the war against Anthropic, has deep ties to the tech world
By Lily Mae LazarusFebruary 27, 2026
8 hours ago
C-SuiteFortune 500 Power Moves
Fortune 500 Power Moves: Which executives gained and lost power this week
By Fortune EditorsFebruary 27, 2026
9 hours ago
AIMilitary
Trump orders U.S. government to stop using Anthropic but gives Pentagon six months to phase it out while Hegseth adds supply-chain risk designation
By Jason MaFebruary 27, 2026
9 hours ago

Most Popular

placeholder alt text
Innovation
An MIT roboticist who cofounded bankrupt robot vacuum maker iRobot says Elon Musk’s vision of humanoid robot assistants is ‘pure fantasy thinking’
By Marco Quiroz-GutierrezFebruary 25, 2026
2 days ago
placeholder alt text
Commentary
'The Pitt': a masterclass display of DEI in action 
By Robert RabenFebruary 26, 2026
2 days ago
placeholder alt text
Success
Jeff Bezos says being lazy, not working hard, is the root of anxiety: ‘The stress goes away the second I take that first step’
By Sydney LakeFebruary 25, 2026
3 days ago
placeholder alt text
Economy
It’s more than George Clooney moving to France: America is becoming the ‘uncool’ country that people want to move away from
By Nick LichtenbergFebruary 27, 2026
22 hours ago
placeholder alt text
Success
Gen Z Olympic champion Eileen Gu says she rewires her brain daily to be more successful—and multimillionaire founder Arianna Huffington says it really does work
By Orianna Rosa RoyleFebruary 25, 2026
3 days ago
placeholder alt text
Success
Japanese companies are paying older workers to sit by a window and do nothing—while Western CEOs demand super-AI productivity just to keep your job
By Orianna Rosa RoyleFebruary 27, 2026
15 hours ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.