The main ages and situations when Medicare begins

Most people become may be able to access for Medicare at age 65, but you can start earlier if you have been receiving Social Security disability benefits for 24 months, or if you have end-stage renal disease or ALS (amyotrophic lateral sclerosis). You do not have to wait until 65 if one of these conditions applies to you. The month you turn 65, you can sign up, and coverage typically starts the first day of that month or the month after, depending on when you enroll.

If you are already getting Social Security retirement or disability payments before 65, Medicare enrollment happens automatically. You will receive your Medicare card in the mail about three months before your 65th birthday. If you are not yet receiving Social Security, you will need to sign up for Medicare separately during your enrollment window.

Key Takeaways

  • You can start Medicare at 65, or earlier if you have been on Social Security disability for 24 months, have end-stage renal disease, or have ALS.
  • If you are already receiving Social Security benefits, Medicare enrollment is automatic and your card arrives by mail before your 65th birthday.
  • If you are not on Social Security, you must sign up for Medicare yourself during your Initial Enrollment Period, which runs from three months before to three months after your 65th birthday.
  • Missing your enrollment window can result in a permanent penalty on your Part B and Part D premiums, so timing matters even if you do not need coverage right away.

Starting Medicare at 65 without a disability

The standard route is to become may be able to access at 65. You do not need to be retired or stop working—age alone qualifies you. Your Initial Enrollment Period begins three months before the month you turn 65 and ends three months after. For example, if you turn 65 in June, you can sign up starting in March and through September.

During this seven-month window, you can enroll in Part A (hospital insurance) and Part B (medical insurance) without penalty. Part A is usually free if you or your spouse paid Medicare taxes for at least 10 years. Part B requires a monthly premium, which varies by income. If you delay Part B and do not have other may have access to coverage (such as employer health insurance), you will pay a higher premium for life—10 percent more for each year you waited past 65.

Medicare before 65: disability and specific conditions

You can start Medicare at any age if you have been receiving Social Security Disability Insurance (SSDI) for 24 consecutive months. The 24-month waiting period begins the month your disability benefits start, not the month you applied. Once those 24 months pass, Medicare Part A and Part B begin automatically.

Two conditions bypass the 24-month wait entirely. If you have end-stage renal disease (ESRD)—permanent kidney failure requiring dialysis or a transplant—you become may be able to access for Medicare when ready, regardless of age or work history. Similarly, if you have been diagnosed with ALS, you become may be able to access for Medicare right away. In both cases, coverage typically begins the first day of the month you meet the medical criteria, though the exact timing depends on when your condition is documented and reported to Social Security.

How to sign up if you are not automatically enrolled

If you are not already receiving Social Security benefits, you must sign up for Medicare yourself. You can enroll online through Medicare.gov, by phone at 1-800-MEDICARE (1-800-633-4227), or in person at your local Social Security office. The Social Security Administration handles Medicare enrollment, even though Medicare is a separate program.

Have your Social Security number and birth certificate or other proof of citizenship ready when you contact them. If you are signing up for Part B, you will also need to decide whether to enroll in a Medigap policy (supplemental insurance) or a Medicare Advantage plan at the same time, because your enrollment window for those is limited. Many people wait until after they have Part A and Part B in place before choosing a supplemental plan, but doing it all at once can simplify the process.

What happens if you miss your enrollment window

If you do not sign up during your Initial Enrollment Period, you can still enroll later, but you will likely pay a penalty. Part B premiums increase by 10 percent for each full year you delayed. This penalty is permanent—you will pay it for as long as you have Part B, even after you finally enroll.

Part D (prescription drug coverage) also carries a penalty for late enrollment: roughly 1 percent of the national base premium for each month you were without coverage. If you had other creditable drug coverage (such as employer insurance) during the time you were not enrolled in Part D, you may avoid this penalty. Keep records of any other coverage you had, because you will need to show proof if you want the penalty waived.

The only way to avoid these penalties is to enroll during your Initial Enrollment Period or to have a may have access to life event (such as losing employer coverage) that opens a Special Enrollment Period outside the normal window.

Special Enrollment Periods and exceptions

A Special Enrollment Period lets you sign up for Medicare outside your Initial Enrollment Period without penalty. Common may have access to events include losing employer health insurance, moving out of your plan's service area, or having a change in your family status. If you are still working and covered by your employer's health plan, you can delay Part B enrollment without penalty as long as the employer has at least 20 employees and you are actively employed.

When you lose that employer coverage, you have eight months to enroll in Part B without penalty. This is one of the most common reasons people enroll after 65. If you think you may have access to for a Special Enrollment Period, contact Social Security or Medicare to confirm before your important date passes.

Timing your enrollment with other coverage

If you are still working at 65 and have health insurance through your employer, you do not have to enroll in Medicare right away. You can delay Part B without penalty as long as your employer plan is active and you are actively employed. However, you should still enroll in Part A at 65, since Part A is usually free and has no penalty for delaying.

When you eventually leave your job or lose employer coverage, you have a limited window—usually eight months—to enroll in Part B without penalty. After that window closes, the permanent 10 percent premium increase applies. Many people make the mistake of thinking they can enroll whenever they want after leaving work; in reality, the clock starts the month your coverage ends, not the month you decide to sign up.

Frequently Asked Questions

Can I start Medicare before I turn 65?

Yes, if you have been on Social Security disability for 24 months, have end-stage renal disease, or have ALS. Otherwise, you must wait until 65. The 24-month clock starts when your disability benefits begin, not when you applied.

What if I am still working at 65—do I have to sign up for Medicare?

You should enroll in Part A (it is usually free), but you can delay Part B if you have employer coverage and are actively employed. When you leave that job, you have eight months to enroll in Part B without penalty. After that, a permanent premium increase applies.

Do I automatically get Medicare when I turn 65?

Only if you are already receiving Social Security retirement or disability benefits. If you are not on Social Security, you must sign up yourself during your Initial Enrollment Period (three months before to three months after your 65th birthday). Missing this window results in a permanent penalty.

What is the penalty for signing up late?

Part B premiums increase by 10 percent for each year you delayed past 65. Part D (drug coverage) penalties are roughly 1 percent of the national base premium per month you were uninsured. Both penalties are permanent and explore for as long as you have coverage.

How do I know if I have a may have access to life event to enroll outside my Initial Enrollment Period?

may have access to events include losing employer coverage, moving out of your plan's service area, or changes in family status. Contact Social Security or Medicare to confirm whether your situation qualifies for a Special Enrollment Period before your important date passes.