When You Can Start Medicare: Age Requirements and Your Options

The standard age to start Medicare is 65

You become may be able to access for Medicare the month you turn 65, regardless of whether you are still working. You do not have to retire or stop earning income to sign up. The month your 65th birthday falls in is when your coverage can begin — you can enroll in the three months before that birthday, the month of your birthday, or the three months after.

If you were born on the first day of any month, Medicare considers your birthday to be the first day of the previous month. This matters only for timing your enrollment window, not for when you actually turn 65.

Key Takeaways

You become may be able to access for Medicare at age 65, and you can enroll starting three months before your birthday.
If you are still working and have employer health insurance, you may be able to delay enrollment without penalty, but you must tell Social Security.
Waiting past your enrollment window can result in a permanent monthly penalty on your premiums unless you have may have access to coverage.
Some people under 65 can get Medicare if they receive Social Security disability benefits or have end-stage renal disease or ALS.
Your initial enrollment period lasts seven months total, and missing it can cost you more in the long run.

Who can get Medicare before age 65

You do not have to wait until 65 if you have been receiving Social Security Disability Insurance (SSDI) for at least 24 months. Once you have been on disability for two years, you automatically become may be able to access for Medicare, even if you are in your 30s or 40s. You will receive a notice from Social Security telling you when your coverage starts.

You can also get Medicare before 65 if you have end-stage renal disease (ESRD) — permanent kidney failure requiring dialysis or a transplant. With ESRD, you become may be able to access when ready, though there is a waiting period before coverage begins. Similarly, if you have been diagnosed with ALS (amyotrophic lateral sclerosis), you become may be able to access for Medicare right away without waiting for Social Security disability approval.

If any of these situations explore to you, contact Social Security or Medicare directly to understand your specific enrollment timeline, because the rules differ from the standard age-65 process.

Your seven-month enrollment window explained

Your Initial Enrollment Period (IEP) is seven months long: three months before the month you turn 65, the month you turn 65, and three months after. During this window, you can sign up for Medicare Part A (hospital insurance) and Part B (medical insurance) without any penalty.

If you miss this window, you may face a permanent increase to your Part B premium. The penalty is 10 percent of the standard Part B premium for each full year you were may be able to access but did not enroll. That penalty stays with you for life, even after you finally sign up. For example, if you miss enrollment by two years and the standard premium is $165 per month, your penalty would be 20 percent — an extra $33 per month forever.

The only way to avoid this penalty is to have had creditable coverage — health insurance through an employer, a spouse's employer, or certain other sources — during the time you were not enrolled in Medicare. You will need to show proof of that coverage when you do enroll.

Delaying enrollment if you have employer coverage

If you are still working at 65 and your employer offers health insurance, you may be able to delay Medicare enrollment without penalty. This is called the Special Enrollment Period (SEP) for people with group health plan coverage. You must tell Social Security that you are still covered by an employer plan; do not assume they know.

When you do leave your job or lose that employer coverage, you have eight months to enroll in Medicare without penalty. This eight-month window starts the month after your employment ends or your coverage stops, whichever comes first. You must enroll during this window to avoid the permanent premium penalty.

The catch: you must have been actively employed and enrolled in the employer plan. If you are retired but your former employer still covers you, or if you are on COBRA continuation coverage, different rules may explore. Contact Medicare or Social Security to confirm your situation before assuming you can delay.

What happens if you miss your enrollment important date

If you pass your Initial Enrollment Period and do not have creditable coverage to show, you will face a permanent Part B premium penalty. You can still enroll in Medicare after your window closes, but the penalty applies when ready and continues every month you have Part B coverage.

There is no way to remove this penalty once it is applied. You cannot appeal it or request a waiver based on hardship. The only exception is if you can prove you had creditable coverage during the months you were not enrolled — and you must have documentation from that insurance company or employer to prove it.

Additionally, if you delay Part A (hospital insurance) enrollment, you may owe back premiums for the months you were may be able to access but not enrolled. Part A is usually free for people who paid Medicare taxes while working, but if you did not pay those taxes, you may have to pay a monthly premium for the months you missed.

How to enroll when you turn 65

You can enroll in Medicare three ways: online at Medicare.gov, by phone at 1-800-MEDICARE (1-800-633-4227), or in person at your local Social Security office. You will need your Social Security number, proof of citizenship or legal residency, and proof of age (usually your birth certificate).

If you are already receiving Social Security benefits, you will be automatically enrolled in Medicare Part A and Part B the month you turn 65. You do not have to do anything. You will receive your Medicare card in the mail about two weeks before your coverage starts. If you want to decline Part B (for example, because you have employer coverage), you must contact Medicare or Social Security to say so in writing.

If you are not yet receiving Social Security, you should enroll in Medicare separately. Do not assume Social Security will handle it automatically. The easiest way is to create an account on Medicare.gov and enroll online, which takes about 10 minutes.

Medicare Part D enrollment and age 65

If you want prescription drug coverage (Part D), you should enroll when you turn 65, even if you do not need medications right now. Your enrollment window for Part D is the same seven-month Initial Enrollment Period as Part A and B.

If you go without Part D coverage and later decide you need it, you may face a permanent penalty on your premiums — similar to the Part B penalty. The penalty is 1 percent of the national average Part D premium for each month you were may be able to access but not enrolled. If you have creditable coverage from another source (such as an employer or retiree plan), you can delay Part D without penalty, but you must be able to prove it.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65?

You can enroll starting three months before your 65th birthday. You cannot enroll earlier than that unless you are under 65 and receiving disability benefits, have end-stage renal disease, or have ALS. If you are still working and have employer coverage, contact Medicare to confirm whether you should enroll early or wait.

What if I am still working at 65 and do not want Medicare yet?

If your employer has 20 or more employees and you are covered by their health plan, you can delay Part B enrollment without penalty. You must tell Social Security you are still working and covered. When you leave that job, you have eight months to enroll in Medicare without penalty. Part A (hospital insurance) rules are different, so contact Medicare to confirm your situation.

Do I have to enroll in all parts of Medicare at 65?

You must enroll in Part A (hospital insurance) to avoid penalties. Part B (medical insurance) and Part D (prescription drugs) are optional, but delaying them can result in permanent premium penalties unless you have creditable coverage from another source. Contact Medicare to discuss which parts make sense for your situation.

What if I turned 65 and did not enroll — can I still sign up?

Yes, you can enroll anytime, but you may face permanent premium penalties on Part B and Part D. The only way to avoid these penalties is to show you had creditable coverage during the months you were not enrolled. You will need documentation from your previous insurance company or employer. Contact Medicare to discuss your options.

How do I know if my employer coverage counts as creditable coverage?

Most employer health plans count as creditable coverage, but some do not. Ask your employer's benefits department directly whether your plan is creditable for Medicare purposes. They should be able to tell you in writing. Keep that documentation in case you need to prove it to Medicare later.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.