Turning 65: Your Medicare Initial Enrollment Period Explained

Turning 65 brings one of the most important health coverage decisions of your life: signing up for Medicare.

The timing matters more than many people realize.

Sign up within your window and the process is straightforward; miss it and you can face gaps in coverage and penalties that last for years.

This guide explains your Initial Enrollment Period, when coverage starts,

who signs up automatically and the special situations that change the rules, such as still working with employer coverage.

What the Initial Enrollment Period is

Your Initial Enrollment Period is your first chance to sign up for Medicare.

For most people it is a seven-month window built around the month you turn 65:

• The three months before the month you turn 65.
• The month you turn 65.
• The three months after the month you turn 65.

During this window you can sign up for Part A (hospital insurance) and Part B (medical insurance),

and you can join a Medicare drug plan or a Medicare Advantage plan.

When your coverage starts

When you sign up affects when coverage begins.

If you sign up during the three months before your birthday month, coverage generally starts on the first day of your birthday month.

If you sign up during your birthday month or the months after, coverage generally starts the month after you sign up.

That is why signing up early in the window is usually the safest choice: it helps you avoid a gap between other coverage ending and Medicare starting.

Medicare.gov explains the exact start dates for each situation.

Who is enrolled automatically

If you already receive Social Security or Railroad Retirement Board benefits before you turn 65,

you are usually enrolled in Part A and Part B automatically,

and your Medicare card arrives in the mail a few months before your birthday.

If you are not yet receiving those benefits, you usually need to sign up yourself, typically through Social Security.

Do not assume enrollment happens on its own; check your situation several months ahead.

Write down the one window that applies to you

A simple exercise prevents most mistakes: on a calendar, mark the first and last month of your Initial Enrollment Period,

then mark the month you want coverage to start. Note any other coverage you have,

such as an employer plan or a marketplace plan, and when it ends.

Seeing the dates in one place makes it clear when to act and avoids last-minute rushing.

If you are married, do the same exercise for your spouse; each person has their own window based on their own birthday.

If you are still working

If you or your spouse are still working and have health coverage through that current job,

you may be able to delay Part B without a penalty and sign up later during a Special Enrollment Period.

The rules depend on the size of the employer and the type of coverage,

so it is important to confirm how your employer coverage works with Medicare before you decide.

Coverage that is not based on current employment, such as retiree coverage or COBRA, generally does not let you delay Part B without risk.

When in doubt, ask your employer's benefits office and a SHIP counselor.

Why late enrollment can cost you

If you do not sign up for Part B when you are first eligible and you do not qualify for a Special Enrollment Period,

you may have to pay a late enrollment penalty for as long as you have Part B.

There is also a separate penalty for going without creditable drug coverage for too long after your Initial Enrollment Period.

If you miss your window, the General Enrollment Period, from January 1 to March 31 each year,

lets you sign up, but penalties may apply and coverage does not start right away.

The choices to make during your window

1. Original Medicare or Medicare Advantage: the two main ways to get your Medicare coverage.
2. Drug coverage: a separate drug plan with Original Medicare, or drug coverage included in many Medicare Advantage plans.
3. Supplemental coverage: with Original Medicare, many people consider a Medigap policy to help with out-of-pocket costs.

Medigap has its own important window: a six-month Medigap Open Enrollment Period that starts the month you are 65 or older and enrolled in Part B.

During that period, insurers generally cannot refuse to sell you a policy because of health conditions.

Protect your new Medicare card

Your Medicare card shows a Medicare Number that is different from your Social Security number.

Treat it like a credit card: share it only with your doctors, pharmacies, insurers and people you trust to help with your health care.

Medicare will not call you out of the blue to ask for your number,

and scammers often target people who are new to Medicare with offers that sound official.

If someone pressures you, hang up and call Medicare yourself using the official number.

A simple checklist for the months before 65

• Six months before: confirm whether you will be enrolled automatically.
• Four months before: review your current coverage and when it ends.
• Three months before: sign up, if you need to, so coverage starts on time.
• During the window: compare drug and Medicare Advantage plans, or Medigap policies.
• Before coverage starts: keep your Medicare card in a safe place and share the number only with providers.

Frequently Asked Questions

Can I sign up for Medicare if I am not retiring?

Yes. Medicare eligibility is based on age (or certain disabilities), not on retirement.

You can have Medicare and keep working.

Is Part A free?

Most people do not pay a premium for Part A because they or a spouse paid Medicare taxes long enough while working.

Part B has a monthly premium.

Where can I get free help?

Your State Health Insurance Assistance Program offers free, unbiased counseling about enrollment timing and choices.

This guide is general information and is not affiliated with Medicare. Confirm your dates with the official sources below.

Sources and Further Reading

• Medicare.gov — How to sign up: enrollment periods and how to sign up.
• Medicare.gov — When coverage starts: start dates depending on when you sign up.
• Medicare.gov — Medigap: supplemental policies and the Medigap Open Enrollment Period.
• SHIP — State Health Insurance Assistance Programs: free, unbiased enrollment counseling.