The Basic Requirements for Medicare

Medicare is available to people who are 65 or older, regardless of income or health history. You do not have to be retired or have worked a certain number of years — age 65 is the main threshold. The program is also open to some younger people: those under 65 with end-stage renal disease (permanent kidney failure requiring dialysis or transplant), those with ALS (Lou Gehrig's disease), and those who have received Social Security Disability Insurance (SSDI) for at least 24 months.

If you are a U.S. citizen or permanent resident, you can enroll. Permanent residents must have lived in the United States for at least five consecutive years. Non-citizens who are not permanent residents are not covered, with rare exceptions for certain government employees and their families.

You do not need to pass a medical exam or answer health questions to join Medicare at 65. The program covers you regardless of pre-existing conditions, and insurers cannot deny you or charge you more because of your health history.

Key Takeaways

  • You become may be able to access for Medicare at age 65 if you are a U.S. citizen or permanent resident who has lived in the country for at least five consecutive years.
  • People under 65 with end-stage renal disease, ALS, or 24 months of SSDI payments can also join Medicare before reaching 65.
  • Medicare does not require a medical exam, income test, or employment history — your age and residency status are what matter.
  • You must enroll during your initial enrollment period, which begins three months before the month you turn 65 and ends three months after, or face potential late penalties.

Work History and Social Security Credits

Most people who join Medicare at 65 do not need to have worked a certain number of years. However, if you or your spouse worked and paid Medicare taxes for at least 10 years (40 quarters), you will not pay a monthly premium for Part A (hospital insurance). If you have fewer than 10 years of work history, you can still join Medicare at 65, but you will pay a premium for Part A unless you are 65 or older and have been a permanent resident for at least five years.

Your work history is tied to your Social Security record. When you explore for Medicare, the Social Security Administration checks your earnings record automatically. You do not need to reapply or provide pay stubs — the system pulls this information from what you have already reported.

Age-Based Enrollment and Your Initial Period

Your initial enrollment period is a seven-month window centered on the month you turn 65. It starts three months before that birthday month and ends three months after. For example, if you turn 65 in June, your period runs from March through September.

You should enroll during this window to avoid late penalties. If you miss it and do not have a valid reason (called a "may have access to event"), you may pay a permanent 10 percent surcharge on your Part B premium for each year you delayed. The surcharge applies for as long as you have Medicare. Some people are exempt from this penalty — for instance, if you are still working and covered by your employer's health plan, you may have a special enrollment period after you leave that job.

Younger People with Disabilities or Kidney Disease

If you are under 65 and have received SSDI for 24 consecutive months, you become may be able to access for Medicare. The 24-month clock starts from the month you first received a disability payment, not from the month you applied. Once you reach 24 months, you are automatically enrolled in Medicare Part A and Part B.

People with end-stage renal disease can join Medicare as soon as they begin dialysis or receive a transplant, regardless of age. Those with ALS (amyotrophic lateral sclerosis) are may be able to access when ready upon diagnosis, without waiting periods. Both groups enroll through their dialysis center, transplant center, or ALS clinic rather than through Social Security.

Residency and Citizenship Status

You must be a U.S. citizen or a lawful permanent resident (green card holder) to join Medicare. Permanent residents must have lived in the United States for at least five consecutive years before they turn 65. Time spent outside the country breaks the five-year requirement, so if you leave and return, the clock restarts.

If you are a citizen living abroad, you can still enroll in Medicare at 65 and receive benefits in most countries. However, coverage outside the United States is limited — Medicare typically covers emergency care only. Some U.S. territories (Puerto Rico, the U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands) have different rules; contact Social Security or Medicare directly if you live in one of these areas.

Income and Asset Limits

Medicare has no income or asset limits. You can be wealthy or have very little money and still join at 65. Your bank account, home, investments, and earnings do not affect your ability to enroll or your monthly premiums.

However, if your income is higher, you may pay more for Part B and Part D (prescription drug coverage). These are called income-related monthly adjustment amounts (IRMAA). They explore if your modified adjusted gross income exceeds certain thresholds, which change each year. The higher your income, the higher your premiums — but you are not denied coverage.

Special Enrollment Periods and Exceptions

If you miss your initial enrollment period, you may still join Medicare without a penalty if you have a may have access to event. These include losing employer health coverage, moving to a new state, or having a family member's status change. You have two months from the end of the may have access to event to enroll.

If you are still working at 65 and covered by your employer's health plan, you can delay enrolling in Part B without penalty. When you leave that job or lose the coverage, you have eight months to enroll in Part B without a surcharge. This is called the special enrollment period for group health plan coverage. You should still enroll in Part A at 65, even if you delay Part B, because Part A has no premium if you have 40 work credits.

Frequently Asked Questions

Do I have to enroll in Medicare at 65 if I am still working?

You do not have to enroll in Part B if you are covered by your employer's health plan and are still working. However, you should enroll in Part A at 65 because it has no premium if you have 40 work credits. When you leave your job, you have eight months to enroll in Part B without a penalty.

What happens if I miss my initial enrollment period?

You may face a permanent 10 percent surcharge on your Part B premium for each year you delayed, unless you have a may have access to event like losing employer coverage. You can still enroll, but the penalty stays with you for life. Some people are exempt — ask Social Security about your situation.

Can I get Medicare if I am not a U.S. citizen?

You must be a U.S. citizen or a lawful permanent resident who has lived in the country for at least five consecutive years. Non-citizens without permanent resident status are not covered, with limited exceptions for certain government employees and their families.

Does Medicare cover me if I move outside the United States?

Medicare coverage outside the U.S. is very limited — it typically covers emergency care only in most countries. If you move abroad permanently, contact Medicare to understand what services you can use. Some U.S. territories have different rules.

What if I have fewer than 10 years of work history?

You can still join Medicare at 65, but you will pay a monthly premium for Part A (hospital insurance) unless you are 65 or older and have been a permanent resident for at least five years. Part B and Part D have their own premiums regardless of work history.