The Basic Rule: Age 65 or Certain Disabilities

You become may be able to access for Medicare when you turn 65, regardless of your income or health history. You do not have to retire, and you do not have to be poor. If you are under 65, you may also be may be able to access 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).

may be able to access is not the same as enrollment. Being may be able to access means you meet the age or disability requirement. Enrollment means you have actually signed up and your coverage has started. Many people become may be able to access at 65 but do not enroll right away—and that choice can cost them money in penalties later.

Key Takeaways

  • You become may be able to access for Medicare at age 65, or earlier if you have been on Social Security disability for 24 months, end-stage renal disease, or ALS.
  • You must actively enroll during your Initial Enrollment Period, which runs three months before your 65th birthday through three months after it.
  • If you delay enrollment past your Initial Enrollment Period without a valid reason, you will pay a permanent penalty on your Part B and Part D premiums.
  • You can enroll online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.
  • If you are still working and have health insurance through your employer, you may be able to delay enrollment without penalty if your employer has 20 or more employees.

Your Initial Enrollment Period: The Three-Month Window

Your Initial Enrollment Period is the only time you can enroll in Medicare without facing a penalty for late enrollment. It runs for seven months: three months before the month you turn 65, the month you turn 65, and three months after.

If your birthday is June 15, for example, your Initial Enrollment Period starts March 1 and ends September 30. You can enroll any time during those seven months. The coverage you choose will start on the first day of the month you turn 65, or the first day of the month after you enroll, whichever is later.

Missing this window does not mean you can never enroll—but it does mean you will pay more. If you enroll after your Initial Enrollment Period ends, you will owe a permanent penalty added to your Part B premium (the part that covers doctor visits) and your Part D premium (the part that covers prescription drugs). These penalties stay with you for life, even if you move to a different plan.

When You Can Delay Without a Penalty

There is one major exception: if you are still working and covered by health insurance through your employer, you may be able to delay Medicare enrollment without penalty. This is called creditable coverage. Your employer's plan must have at least 20 employees for this rule to explore.

If you have creditable coverage, you can wait to enroll in Medicare Part B and Part D until you leave your job or lose the employer coverage. You then have eight months to enroll without penalty. You must still enroll in Part A (hospital insurance) at 65 unless you are still working and your employer offers coverage.

To use this exception, you need to know whether your employer plan counts as creditable coverage. Ask your employer's benefits department or your plan's customer service line. When you do leave your job, keep your coverage letter—you will need to show it when you enroll in Medicare to prove you had creditable coverage.

How to Enroll in Medicare

You have three main ways to enroll. The easiest for most people is online at Medicare.gov. You will need to create an account, answer questions about your age and work history, and choose your coverage. The process takes about 15 minutes.

You can also call 1-800-MEDICARE (1-800-633-4227) to enroll by phone. A representative will walk you through your options and answer questions about costs. The line is open 24 hours a day, seven days a week. If English is not your first language, interpreters are available.

A third option is to visit your local Social Security office in person. You can find the nearest office at ssa.gov. Bring your Social Security card, proof of citizenship (passport or birth certificate), and proof of residence (a recent utility bill or lease). Staff can enroll you on the spot, though wait times vary by location.

What Happens If You Miss Your Enrollment Period

If you do not enroll during your Initial Enrollment Period and you do not have creditable coverage from an employer, you will pay a penalty. For Part B, the penalty is 10 percent of the standard premium for each full year you were may be able to access but not enrolled. If the standard Part B premium is $165 a month and you waited three years, you would pay an extra $49.50 per month for life.

Part D (prescription drug coverage) has a similar penalty: 1 percent of the national average premium for each month you were may be able to access but not enrolled. These penalties are permanent. Even if you switch plans later, the penalty stays on your record.

You can enroll in Medicare any time after your Initial Enrollment Period ends, but the penalty will explore when ready. The only way to avoid the penalty is to have had creditable coverage from an employer or to have a valid reason for missing the important date—and valid reasons are narrow. They include being in the military, being out of the country for more than six months, or being in a hospital or nursing home without Medicare.

Medicare Parts and What Each Covers

When you enroll, you will choose between Original Medicare and Medicare Advantage. Understanding what each part covers helps you make the right choice for your situation.

Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. Most people do not pay a premium for Part A if they or their spouse paid Medicare taxes while working. Part B covers doctor visits, outpatient care, and some preventive services. Part B has a monthly premium, which changes each year.

Part D covers prescription drugs. You choose a Part D plan from a list of private insurers. If you do not enroll in Part D when you first become may be able to access and you do not have creditable drug coverage from an employer or union, you will pay a penalty when you do enroll.

Original Medicare is run by the federal government. You can see any doctor or hospital that accepts Medicare. You pay a deductible and coinsurance. Medicare Advantage (Part C) is run by private insurance companies. It includes Part A and Part B, and usually Part D. You typically pay lower out-of-pocket costs but must use doctors and hospitals in the plan's network.

Special Situations: Disability, ESRD, and ALS

If you are under 65 and have been receiving Social Security Disability Insurance (SSDI) for 24 months, you become may be able to access for Medicare automatically. You do not have to do anything—Medicare will start on the 25th month of your disability benefits. You can enroll in Part D at the same time.

If you have end-stage renal disease (ESRD), you may be may be able to access for Medicare regardless of age. You become may be able to access the first day of the month you start dialysis or the month you have a kidney transplant. If you have ALS, you become may be able to access for Medicare the first day of the month you are approved for Social Security disability benefits.

If you are in either of these groups, contact Social Security or Medicare to confirm your may be able to access date. You still need to actively enroll in Part B and Part D to avoid penalties, even though Part A starts automatically.

Frequently Asked Questions

What if I turn 65 while I am still working?

You can delay enrolling in Part B and Part D if your employer has 20 or more employees and you are covered by the employer's health plan. You must still enroll in Part A at 65. When you leave your job, you have eight months to enroll in Part B and Part D without penalty. Keep your coverage letter from your employer as proof.

Can I change my mind after I enroll?

Yes. You have a seven-month Initial Enrollment Period, and you can change your plan choices during the annual Open Enrollment Period (October 15 to December 7 each year). If you enroll in Original Medicare and later want Medicare Advantage, or vice versa, you can switch during Open Enrollment without penalty.

Do I have to enroll in Part D if I do not take prescription drugs?

You do not have to, but if you enroll later when you do need drugs, you will pay a penalty. The penalty is 1 percent of the national average premium for each month you were may be able to access but not enrolled. If you never take drugs, you can skip Part D, but the penalty applies if you change your mind.

What 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 United States for at least five consecutive years to be may be able to access for Medicare. If you are a lawful permanent resident, bring your green card and proof of residence when you enroll.

How do I know if my employer plan is creditable coverage?

Ask your employer's benefits department or call your health plan's customer service number. They can tell you whether your plan meets Medicare's definition of creditable coverage. If it does, ask for a written statement—you will need it when you enroll in Medicare to prove you had coverage and avoid penalties.