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OpenWindowMedicare signup
calendar & guide
Medicare signup, explained as a calendar

Medicare signup runs on windows of time. Let's find yours.

Open Window is a free, privately run guide. Tell us what's going on in your life, see which enrollment period generally applies, gather what you'll need, and, only if you choose, ask a licensed insurance agent to reach out.

  • Free to use
  • No pressure, no obligation
  • Plans vary by ZIP code, availability and eligibility
A calendar page with one week highlighted in mint and a single day circled in plum, with a pencil resting on the corner
Initial Enrollment7 months around your birthday
Annual ElectionOct 15 – Dec 7
Step one

Which sounds most like you?

Pick the situation that fits. We'll show which enrollment period generally applies. It's a starting point for your questions, not a ruling on your eligibility.

My situation
The enrollment calendar

Five windows worth knowing.

Slide through the year. Shaded months show when each period generally runs.

01

Initial Enrollment Period

7 months around your 65th birthday

Starts 3 months before the month you turn 65, includes your birthday month, and runs 3 months after. For many people it's the first and simplest window to sign up for Part A and Part B.

Moves with your birthday, so see the explainer below.

02

Annual Election Period

October 15 – December 7

The yearly window to join, switch or drop a Medicare Advantage plan or a Part D drug plan. Changes generally take effect January 1.

Also called Open Enrollment or the Fall window.

03

Medicare Advantage Open Enrollment

January 1 – March 31

For people already in a Medicare Advantage plan: a chance to switch to a different Medicare Advantage plan or go back to Original Medicare (and add a drug plan).

Generally one change during this window.

04

Special Enrollment Periods

Triggered by a qualifying life event

Moving out of your plan's area, losing employer coverage, and certain other events can open a limited window outside the usual dates. Length and rules depend on the event.

Can happen any month. Documentation may be required.

05

General Enrollment Period

January 1 – March 31

For people who didn't sign up for Part A or Part B when first eligible and don't qualify for a Special Enrollment Period. Coverage generally starts the month after you sign up.

Late-enrollment penalties can apply in some cases.

Birthday month explainer

Your birthday sits in the middle of the window.

What you'll need

Gather these, tick them off.

Having the basics nearby makes any conversation (with Social Security, Medicare.gov or an agent) easier. Your ticks stay on this device only.

0 of 10 ready

1About you

2Your current coverage

3Your care

Optional next step

Want a person to walk through it with you?

Share a few details and a licensed insurance agent from one of our partners may contact you about plan options available where you live. There's no cost to ask, and you're never required to enroll in anything.

Your request form loads here

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A dotted path of three stepping stones: a question mark, a speech bubble, and a check mark
Who we are

A free guide, not a plan seller.

Open Window is a free informational and referral service run by a private company. We're not an insurer, agent or broker, and we don't enroll anyone in Medicare.

  1. You explore. Use the tools above. No sign-up needed.
  2. You choose to ask. If you submit the form and consent, we share your request with participating partners.
  3. A licensed agent may reach out. They can discuss plans available where you live. What you do next is up to you.
See how referrals work
Good questions

Before you decide anything

What's the difference between Original Medicare and Medicare Advantage?

Original Medicare is Part A (hospital) and Part B (medical), run by the federal government. Medicare Advantage (Part C) plans are offered by private companies approved by Medicare and bundle Part A and Part B coverage, often with extras. Drug coverage is Part D, which can be standalone or built into some Advantage plans.

What is Medigap?

Medicare Supplement (Medigap) is sold by private insurers to help with some costs Original Medicare doesn't cover. It's used with Original Medicare, not with Medicare Advantage. Availability and rules vary by state.

If I miss my window, am I out of luck?

Not necessarily. There may be other periods, such as the General Enrollment Period or a Special Enrollment Period, though coverage could start later and some people face late-enrollment penalties. Medicare.gov, Social Security or your State Health Insurance Assistance Program (SHIP) can confirm your situation.

Does using this site cost anything or commit me to a plan?

No. The tools are free, and requesting a call is optional. Submitting a request does not enroll you in any plan.

Who will contact me if I submit the form?

Licensed insurance agents or organizations among our independent partners may contact you, only in the ways you consent to. See the partners page and our Privacy Policy.

Request a call from a licensed agent