Medicare starts at age 65 for most people

You become may be able to access for Medicare the month you turn 65, regardless of whether you are still working. The program is federal health insurance run by the Centers for Medicare & Medicaid Services (CMS). You do not have to retire to sign up, and you do not have to be poor. Age 65 is the standard threshold, though a small number of younger people with disabilities or end-stage renal disease can enroll earlier.

The enrollment window opens three months before the month you turn 65 and closes three months after. If you miss this window, you may pay a higher premium for the rest of your life, so the timing matters. Your birthday month is the key date to remember.

Key Takeaways

  • Medicare enrollment begins three months before you turn 65 and ends three months after, so you have a seven-month window to sign up.
  • If you delay enrollment past your birthday without a valid reason, you will pay a permanent penalty on your premiums.
  • You can enroll online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.
  • Some people under 65 with disabilities or end-stage renal disease may be able to enroll earlier through a different process.

How the enrollment window works

Your Initial Enrollment Period (IEP) is seven months long: it starts three months before your 65th birthday month and ends three months after. For example, if you turn 65 in June, your window opens in March and closes in September. You can enroll at any point during those seven months.

Signing up during this window protects you from late-enrollment penalties. If you wait until after your window closes, Medicare will add a permanent surcharge to your Part B (medical insurance) and Part D (prescription drug) premiums. That penalty stays with you for as long as you have Medicare, so delaying is expensive.

There is one exception: if you or your spouse are still working and covered by an employer health plan, you may be able to delay without penalty. This is called creditable coverage. You will need to show proof that your employer plan is at least as good as Medicare coverage. Even with this exception, you should enroll in Medicare within eight months of losing that employer coverage to avoid penalties.

Enrolling before you turn 65

You can start the enrollment process up to three months before your birthday. Many people enroll at their local Social Security office, which handles Medicare sign-ups alongside Social Security claims. You can also enroll online at Medicare.gov or by calling 1-800-MEDICARE (1-800-633-4227).

When you enroll, you will choose between Original Medicare (Part A and Part B) or a Medicare Advantage plan (Part C). Part A covers hospital care, and Part B covers doctor visits and outpatient services. Medicare Advantage is an alternative offered by private insurers that bundles hospital, doctor, and often prescription drug coverage into one plan. You will also need to decide about prescription drug coverage (Part D) if you choose Original Medicare.

Have your Social Security number ready when you enroll. If you are not yet receiving Social Security benefits, you will need to explore for those at the same time, because Medicare uses your Social Security record to process enrollment.

What happens if you miss your enrollment window

If you do not sign up during your seven-month Initial Enrollment Period, you enter a General Enrollment Period (GEP) that runs from January 1 to March 31 each year. You can enroll during any GEP, but coverage does not start until July 1 of that year. This means if you miss your IEP in September and enroll in January, you will have no Medicare coverage from October through June.

More importantly, you will owe a permanent penalty. Your Part B premium increases by 10 percent for each full year you delayed past your IEP. If you delayed for three years, your premium goes up 30 percent permanently. Part D penalties work the same way. These penalties are calculated and added to your monthly bill by Social Security.

The only way to avoid this penalty is to have had creditable coverage (employer or union health insurance) during the time you were not enrolled. You will need to provide proof to Medicare that your coverage was continuous and at least as good as Medicare.

Enrolling before age 65 with a disability

If you are under 65 and receive Social Security Disability Insurance (SSDI), you become may be able to access for Medicare after you have been on SSDI for 24 months. You do not have to wait until 65. Medicare will enroll you automatically once you hit that 24-month mark, though you can request earlier enrollment if you need it.

If you have end-stage renal disease (ESRD) — permanent kidney failure requiring dialysis or transplant — you may be able to enroll in Medicare regardless of age. You will need documentation from your doctor or dialysis center. Coverage typically begins the month your treatment starts, though the exact timing depends on the type of treatment.

If you have ALS (amyotrophic lateral sclerosis), you become may be able to access for Medicare when ready upon approval for SSDI, without waiting the usual 24 months. You should contact Social Security to confirm your enrollment once your SSDI claim is approved.

What to bring when you enroll

You will need your Social Security number and proof of citizenship or legal residency. A passport, birth certificate, or naturalization papers all work. If you are enrolling in person at a Social Security office, bring a photo ID as well.

If you are claiming based on a spouse's work record rather than your own, bring your marriage certificate. If you are divorced and claiming on an ex-spouse's record, bring the divorce decree and proof that you have been divorced for at least two years.

Have your current health insurance information available, especially if you have employer coverage. You may need to show that your employer plan meets Medicare's standards for creditable coverage.

Where to enroll

You have three main options. Medicare.gov has an online enrollment tool that walks you through the process step by step. You can create an account and complete everything from home. 1-800-MEDICARE is the federal helpline; representatives can enroll you over the phone and answer questions about your specific situation. Your local Social Security office handles in-person enrollments and can also help you explore for Social Security benefits at the same time if you have not already.

Many Area Agencies on Aging also offer free enrollment help. You can find your local agency through the Eldercare Locator at 1-800-677-1116. Some community health centers and libraries offer enrollment information as well, especially in the months leading up to the fall enrollment season.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65?

Yes. Your enrollment window opens three months before your 65th birthday. You can sign up as early as that date. If you are under 65 and on SSDI, you become may be able to access after 24 months of receiving benefits and will be enrolled automatically.

What happens if I am still working at 65?

You can still enroll in Medicare at 65 even if you are working. If your employer provides health insurance, you may be able to delay Medicare Part B without penalty as long as your employer coverage is creditable. You must still enroll in Part A (hospital insurance) at 65.

Do I have to enroll in Medicare if I have employer coverage?

Not when ready, if your employer plan is creditable. However, you must enroll within eight months of losing that coverage to avoid permanent penalties. It is safer to enroll at 65 and coordinate the two plans rather than risk missing the important date later.

What if I turn 65 and do not have health insurance?

Enroll in Medicare during your Initial Enrollment Period (three months before to three months after your birthday). If you miss that window, you can enroll during the General Enrollment Period (January 1 to March 31), but coverage will not start until July 1, leaving you uninsured in the meantime.

Can my spouse enroll at the same time I do?

Yes, if your spouse is also 65 or older. Each person has their own seven-month enrollment window based on their birthday. You can enroll together at the same office or online, but each enrollment is separate.