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HomeMedicare AdvantageMichiganSterling HeightsJanuary 1 to March 31: Medicare Advantage in Sterling Heights

Medicare Advantage

January 1 to March 31: Medicare Advantage in Sterling Heights

STERLING HEIGHTS, Mich. — The new plan year is almost here, and with it comes a short second chance. From January 1 through March 31, 2027, people already enrolled in a Medicare Advantage plan can make one change if the coverage they picked during fall enrollment isn't working out. This window — the Medicare Advantage Open Enrollment Period — closes at the end of March and won't reopen until January 2028 for most people.

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2027 PLAN ALERT

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Annual Enrollment: Oct 15 – Dec 7

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Reading a guide at home in Sterling Heights — illustrating this Medicare guide
Photo: Naitian(Tony) Wang Photo by Naitian(Tony) Wang on Unsplash

Key takeaways

  • The Medicare Advantage Open Enrollment Period runs January 1 through March 31 each year and allows one plan change.
  • This window is only for people already in a Medicare Advantage plan on January 1; those with only Original Medicare can't use it to join an Advantage plan.
  • Miss the March 31 deadline and you'll generally have to wait until the fall Annual Enrollment Period (October 15–December 7) to switch again.
  • Certain life events — like moving out of Macomb County — can trigger a Special Enrollment Period outside these dates.

What this window actually lets you do

If you were enrolled in a Medicare Advantage plan as of January 1, you can use this period to:

That's it. You get one change during this window, and it takes effect the first day of the month after the plan receives your request.

What it does NOT let you do

This is where readers most often trip up. The Medicare Advantage Open Enrollment Period is not a free-for-all. During January through March, you cannot:

If any of those describe you, your next real chance is the fall Annual Enrollment Period, October 15 through December 7, with coverage starting January 1.

How the calendar fits together

Here's the timing at a glance, and why it matters if you live in Sterling Heights or anywhere else in Macomb County:

Sterling Heights is in Macomb County, where plan choices, provider networks, and pharmacy lists are set at the county level. If you move even a short distance across a county line, your options can change and a Special Enrollment Period may open.

What happens if you miss March 31

If March 31 comes and goes and you're unhappy with your Medicare Advantage plan, you're generally locked in for the rest of the year. There are exceptions:

Otherwise, plan to revisit your choice during the fall Annual Enrollment Period.

By the numbers

Medicare Part B premium, 2006–2026

The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.

$0$50$100$150$200200820122016202020242026

Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.

By the numbers

How people get Medicare in Macomb County

61% are on Medicare Advantage
(MA penetration in Macomb County)
61%
39%
Medicare Advantage Medicare Supplement (Medigap) Original Medicare only
U.S. average

MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.

Program-level changes worth knowing for 2027

Even if you don't switch plans, a few Medicare-wide rules take effect that shape drug costs in the new year:

These apply regardless of which plan you're in, so review your Annual Notice of Change letter with them in mind.

Before you make a move

A few practical steps before you switch:

1. Re-read the Annual Notice of Change your plan mailed this fall — it lists what's different for 2027. 2. Confirm your doctors, hospitals, and preferred pharmacies are still in-network. 3. Check that every prescription you take is still on the plan's formulary. 4. If you take costly medications, ask about the Medicare Prescription Payment Plan.

Where to get unbiased help

For personalized answers, use the official sources:

Key dates

Medicare enrollment periods at a glance

  • Around your 65thInitial Enrollment PeriodA 7-month window around the month you turn 65 — your first chance to sign up.
  • October 15 – December 7Annual Enrollment PeriodAnyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan.
  • January 1 – March 31Medicare Advantage Open EnrollmentIf you're already in a Medicare Advantage plan, you can make one change.
  • January 1 – March 31General Enrollment PeriodFor people who missed their first chance to sign up for Part B.
  • VariesSpecial Enrollment PeriodTriggered by life events like moving or losing other coverage.

Dates are set by Medicare and apply nationwide. Confirm your personal windows at Medicare.gov or 1-800-MEDICARE.

Compare with a licensed agent

See Medicare options serving Sterling Heights & speak with a licensed agent

Medicare Advantage companies in Macomb County

By local enrollment size · informational, not a ranking
CompanyLocal enrollmentPlans offeredLocal agentsAction
Blue Cross Blue Shield of Michigan Mutual Ins CoRegional—Yes
HumanaNational—Yes
Henry Ford Health SystemRegional—Yes
Aetna (CVS Health)National—Yes
Corewell HealthRegional—Yes
Centene (WellCare)National—Yes
Enrollment data: CMS Medicare Advantage enrollment by company (county level). Figures shown are illustrative sample data pending the current CMS file. Listed by enrollment size, largest first — this is not a ranking, recommendation, or endorsement of any company or plan.

Provided by licensed insurance partners; MyMedicarePlans.org may be compensated. Not a ranking or endorsement of any plan.

Explore

When can you enroll? An interactive year

JFMAMJJASOND
October 15 – December 7 — anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan. Changes take effect January 1.

Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.

Explore

The parts of Medicare

Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium for Part A.

Good to know

Frequently asked questions

Can I use the January–March window to join Medicare Advantage for the first time?
No. This window is only for people already enrolled in a Medicare Advantage plan on January 1. If you have only Original Medicare, your main opportunity to join an Advantage plan is the fall Annual Enrollment Period, October 15 through December 7, unless a Special Enrollment Period applies to you.
How many changes can I make between January 1 and March 31?
One. Once your switch is processed and takes effect, that's your change for the window. Choose carefully and confirm your doctors, pharmacies, and medications before you submit.
When does my new coverage start?
Coverage begins the first day of the month after the plan receives your enrollment request. So a change made in February would start March 1.
What if I move out of Sterling Heights during the year?
Moving to an address that isn't in your current plan's service area typically triggers a Special Enrollment Period, letting you change plans outside the usual windows. Report the move to your plan and to Medicare as soon as possible so you don't have a coverage gap. Have questions about your own situation? Start at medicare.gov, call 1-800-MEDICARE, or reach MMAP, Michigan's free SHIP counseling service, at 1-800-803-7174.
Sources & further reading
  • CMS — Medicare enrollment periods (medicare.gov)

For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.

Also for Sterling Heights

Content Integrity Standards

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This page was last updated: September 30, 2026.

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