Medicare enrollment in Minnesota: dates, windows and how to sign up

Medicare enrollment in Minnesota follows federal timing rules, and missing one can cost you money for years. The good news is that the system is predictable once you know the windows. This guide walks through every enrollment period that matters for Minnesotans, from your first chance to sign up at 65 through the annual windows you can use every year after.

The Initial Enrollment Period: your first 7 months

Your Initial Enrollment Period (IEP) lasts 7 months: the 3 months before your 65th birthday month, your birthday month itself, and the 3 months after.

Timing affects when coverage starts. If you sign up during one of the 3 months before your birthday month, your Part B coverage starts the month you turn 65. If you sign up during your birthday month or one of the 3 months after, your start date is pushed later, in some cases by two to three months. Signing up early in the window keeps your coverage aligned with your birthday.

Are you signed up automatically, or do you need to act?

Some people are enrolled automatically, others must apply themselves.

Automatic enrollment

If you already receive Social Security benefits at least 4 months before turning 65, you are typically enrolled in Part A and Part B automatically, and your Medicare card arrives in the mail a few months before your birthday month.

Sign up yourself

If you are not yet taking Social Security, which is common for people who plan to work past 65 or delay benefits for a higher check, you must apply through the Social Security Administration. You can do that online at ssa.gov, by phone, or at a local office. Missing the window without qualifying coverage elsewhere triggers late penalties.

Working past 65: when you can delay Part B

If you are covered by a group health plan through your own current employment (or your spouse's current employment), you can delay Part B without penalty and sign up later during a Special Enrollment Period.

Two cautions Minnesotans ask about most:

• COBRA coverage does not count. It is a continuation of employer coverage, not active employment coverage, so relying on it past 65 can create a penalty trap.
• Retiree health plans do not count either. Only coverage from current, active employment allows a penalty-free delay.

COBRA and retiree coverage also generally pay after Medicare when you are 65 or older, which means Medicare becomes primary whether or not you are enrolled. Talk to an advisor before assuming your old employer plan will carry you.

The Annual Enrollment Period (AEP): October 15 to December 7

Every year from October 15 to December 7, you can join, switch, or drop a Medicare Advantage or Part D drug plan, with changes taking effect January 1. This is the window when plans release their new year's changes, and it is the right time to re-check your drug plan and network against your current medications and doctors.

The Medicare Advantage Open Enrollment Period: January 1 to March 31

If you are already enrolled in a Medicare Advantage plan, you have a second chance each year from January 1 to March 31. You can switch to a different Advantage plan once, or drop the Advantage plan and return to Original Medicare with a standalone Part D drug plan. You cannot use this window to join an Advantage plan for the first time from Original Medicare.

Special Enrollment Periods (SEPs)

Life changes open one-time enrollment windows outside the standard dates, including:

• Moving out of your plan's service area
• Losing employer or union coverage, including COBRA ending
• Losing Medicaid or Extra Help eligibility changes
• Other qualifying events defined by Medicare

SEPs are time-limited, usually measured in months from the event, so act soon after the change happens.

Minnesota's Medigap enrollment windows

Minnesota adds two supplement windows on top of the federal rules, and both are worth marking on your calendar.

The annual Medigap guaranteed issue window

Minnesota has an annual Medigap guaranteed issue window from October 15 through December 7. During it, you can switch Medigap plans (or switch between Original Medicare with a supplement and a Medicare Advantage plan) with guaranteed acceptance, no health questions, subject to the window's specific rules.

The one-time 65 to 70 window

Since August 2026, Minnesotans ages 65 to 70 have a one-time guaranteed issue window to enroll in a Medigap plan regardless of pre-existing conditions. If you postponed Medicare or stayed on employer coverage and missed your original Medigap Open Enrollment Period, this window is a rare second chance at guaranteed acceptance.

Separately, your standard Medigap Open Enrollment Period is 6 months, starting the month you are both 65 and enrolled in Part B. During it, federal law guarantees acceptance regardless of health.

A simple enrollment timeline

• Age 64.5 to 65: confirm your Social Security status and decide whether to delay Part B (current-employment coverage only).
• 3 months before your 65th birthday month: sign up, or confirm your automatic enrollment.
• Birthday month: coverage begins if you enrolled early in the window.
• Every October 15 to December 7: review plans for the next year.
• Any qualifying life event: request your Special Enrollment Period promptly.

Frequently asked questions

When should I sign up for Medicare if I turn 65 this year? Enroll during the 3 months before your birthday month when possible. Coverage then starts the month you turn 65. Signing up during or after your birthday month delays your start date.

Am I automatically enrolled in Medicare at 65? Only if you already receive Social Security benefits at least 4 months before turning 65. Otherwise, you must apply through Social Security yourself.

Can I delay Medicare if I keep working past 65? Yes, if you have group coverage through current employment (yours or a spouse's). COBRA and retiree plans do not count, and delaying without qualifying coverage creates permanent penalties.

What are the 2027 Medicare enrollment dates I should know? AEP runs October 15 to December 7 for Advantage and drug plans. The Medicare Advantage Open Enrollment Period runs January 1 to March 31. Your Initial Enrollment Period is the 7 months around your 65th birthday.

What is Minnesota's Medigap guaranteed issue window? Minnesota offers an annual Medigap guaranteed issue window from October 15 through December 7, and a one-time guaranteed issue window for residents ages 65 to 70 regardless of pre-existing conditions, available since August 2026.

What if I missed my Initial Enrollment Period? You may face late penalties, but Minnesota's guaranteed issue windows, including the one-time 65 to 70 window, may give you a path back to coverage. A free review can map your specific situation.