How to Change Medicare Plans: When You Can and How

How to Change Medicare Plans: When You Can and How

You can change Medicare plans during the Annual Enrollment Period (October 15 to December 7, with new coverage starting January 1), during the Medicare Advantage Open Enrollment Period (January 1 to March 31), or during a Special Enrollment Period after a qualifying life event such as a move. Which window you can use depends on the coverage you have now and what you want to switch to. This guide walks through each window, what it lets you change, the steps to switch, and the Medigap rules that catch people off guard.

TL;DR

• Most people can change Medicare Advantage and Part D plans from October 15 to December 7 each year. The new plan starts January 1.
• If you are already in a Medicare Advantage plan, you get a second chance from January 1 to March 31, but only to switch Advantage plans or return to Original Medicare.
• Moving, losing coverage, or qualifying for Medicaid or Extra Help can open a Special Enrollment Period in the middle of the year.
• Medigap is different. Outside your first six months or a guaranteed issue situation, an insurer can deny you a policy, so check before you drop what you have.
• Compare your doctors, drugs and pharmacy in each plan’s network before you switch, not after.

Table of Contents

• The three windows that let you change plans
• How to switch Medicare plans, step by step
• What to check before you switch Medicare Advantage plans
• Changing your Part D drug plan
• Switching from Medicare Advantage to Original Medicare
• Changing a Medigap policy is not like changing an Advantage plan
• When you move
• Where we fit in
• Mistakes that cost people money
• FAQ
• Sources

The three windows that let you change plans

Medicare does not let you swap plans whenever you like. It gives you set windows, and each one allows different changes. According to Medicare.gov’s guide to joining a plan, the main ones are the Annual Enrollment Period, the Medicare Advantage Open Enrollment Period and Special Enrollment Periods.

The dates repeat every year, so you can plan around them. If you want a plain-language walkthrough of how each period works for people just joining Medicare, we cover it in our guide to Medicare enrollment periods.

Annual Enrollment Period: October 15 to December 7

This is the widest window. During it you can move from Original Medicare to a Medicare Advantage plan, move back, switch from one Advantage plan to another, and add, drop or change a Part D drug plan. All of it is covered in the Medicare.gov summary of what you can do during open enrollment.

Your new plan takes effect January 1. Your current plan stays in force until then, so you never have a gap as long as you finish enrolling by December 7.

This is also the period when plans send out their Annual Notice of Change, which lists what is changing in your current plan for next year: premiums, copays, drug lists, provider networks. Reading it is the cheapest way to find out whether your plan still fits.

Medicare Advantage Open Enrollment: January 1 to March 31

This one is narrower and often misunderstood. It applies only if you are already in a Medicare Advantage plan. In that window you can switch to another Advantage plan or return to Original Medicare. You cannot use it to move from Original Medicare into Advantage for the first time, and you cannot use it to add a standalone drug plan if you are staying in Advantage, per the official Medicare guidance.

It is useful if you used your new plan in January and found your doctor, pharmacy or a prescription is not covered the way you expected. You get one more chance to fix it without waiting a year.

Special Enrollment Periods: changing in the middle of the year

Yes, you can change Medicare plans mid-year, but generally only if something qualifying has happened. Medicare lists events such as moving, losing or changing other coverage, getting Medicaid, or qualifying for Extra Help, and the timing of the window varies by situation.

Two timing rules are worth knowing:

• When you enroll during a Special Enrollment Period, coverage generally starts the first of the month after the plan receives your request.
• If you move out of your Advantage plan’s service area, you can switch plans starting when you move and for two full months afterward, according to Medicare’s guide to Advantage and drug plan enrollment periods.

If you were on an employer or retiree plan or COBRA, the rules are different again. See our explainer on COBRA versus Medicare before you give up either one.

How to switch Medicare plans, step by step

Switching is easier than most people expect, because you generally do not cancel the old plan yourself. Joining a new one is what ends the old one.

1. Pull out your current plan’s details. Note your doctors, prescriptions with doses, pharmacy, and what you pay now. The Annual Notice of Change is the best starting point.
2. Decide what you want to change. Is it the premium, a drug that is no longer covered, a doctor who left the network, or the way you get coverage altogether (Original Medicare with Medigap versus Advantage)?
3. Compare plans in your ZIP code. Medicare recommends using Medicare.gov/plan-compare to search for your doctors and other providers and see whether they are in the network of plans you are considering.
4. Confirm the window. Check today’s date against the table above, or confirm that a life event qualifies you.
5. Enroll in the new plan. You can enroll through Plan Finder, contact the plan directly, or call 1-800-MEDICARE (1-800-633-4227; TTY 1-877-486-2048), as the official joining a plan page explains.
6. Keep your confirmation and your new card. Use your old card until the new plan’s start date, then switch over.

A local licensed agent can run steps 2 through 5 with you. Our Medicare enrollment assistance does exactly that, and you do not pay us directly for the guidance.

What to check before you switch Medicare Advantage plans

A lower premium is the easiest thing to compare and often the least important. Before you change Advantage plans, check these in order:

• Your doctors and hospitals. Are they in the network, and is that network type (HMO or PPO) one you are comfortable with? Call the office and ask whether they accept the specific plan, not just the insurance company.
• Your drugs. Look at the formulary tier and any restrictions for each medication. Drug lists change every year.
• Your maximum out-of-pocket. This is the ceiling on what you could pay in a bad year, and it matters more than the copay on a routine visit.
• Extras you actually use. Dental, vision, hearing and over-the-counter benefits differ widely. If you see a chiropractor or similar specialist, read up on insurance coverage for chiropractic care so you know what to ask a plan before you commit.
• Travel and second homes. Many Rockford-area retirees spend winters away. Check how a plan treats care outside its service area.

If you want a second set of eyes, our Medicare plan comparison help compares Advantage, Supplement and drug plans side by side, based on your doctors and prescriptions. For more on how Advantage plans work here, see our page on Medicare Advantage guidance.

Changing your Part D drug plan

Drug plans are the coverage most likely to change under you. Formularies, tiers and pharmacy networks are reset every year, so a plan that was cheap for your medications last year may not be this year.

During the Annual Enrollment Period you can add, drop or change drug coverage. If you are in an Advantage plan that includes drug coverage, that coverage is part of the plan, so changing the drug benefit means changing the plan. Medicare notes that plans are not allowed to call you to solicit enrollment; if one does, you can report it to 1-800-MEDICARE, per the Medicare drug coverage guide.

Before changing, run every medication through Plan Finder, including the pharmacy you actually use. We also offer a Part D prescription review if you would rather have someone do it with you.

Switching from Medicare Advantage to Original Medicare

This is the change with the biggest catch. You can leave Advantage during the Annual Enrollment Period or the Medicare Advantage Open Enrollment Period. You can also join a separate drug plan once you are back in Original Medicare. But Medicare warns that you may not be able to get the same Medigap policy back or may pay higher premiums.

In practice that means you should line up a Medigap policy before you drop your Advantage plan, not after. Original Medicare alone leaves you with the 20% coinsurance and no out-of-pocket limit, and a Supplement is what fills that gap. Medigap is a different product from Advantage: it helps pay costs Original Medicare does not cover, and you cannot use it to pay Advantage copays, deductibles or premiums.

If you join a drug plan, tell your Medigap insurer when the drug coverage starts. The insurer must remove any drug coverage from the Medigap policy and adjust your premium.

Our article on Medicare Advantage versus Medicare Supplement lays out the trade-offs, and our Medigap guidance explains how Supplement plans are sold here.

Changing a Medigap policy is not like changing an Advantage plan

This is where the “switch any time” assumption causes the most trouble. Under federal law you typically do not have a guaranteed right to switch Medigap policies outside your six-month Medigap Open Enrollment Period or specific guaranteed issue situations.

Outside those, an insurer may deny you a policy or charge more based on your health, which is called medical underwriting. The same guide notes that state law may give you additional rights. Some states have extra protections, and the rules in Illinois and Wisconsin are not the same, so confirm with your state insurance department or a local agent before you cancel anything.

A safe habit: never cancel your current Medigap policy until the new one has been approved and you have its start date in writing.

When you move

Moving can change your options more than almost anything else. If you leave your Advantage plan’s service area, you get two full months after the move to switch. If you do not join a new Advantage plan, you will be placed in Original Medicare when your old plan drops you.

That matters for people moving between Illinois and Wisconsin, or out of the region entirely. Plans are built around counties, so the same company may offer a different plan, or none, in your new home. Tell your plan about the move as early as you can, and compare local options right away.

Where we fit in

We are a Medicare agency in Rockford, Illinois, serving Northern Illinois and Southern Wisconsin. We compare Medicare Advantage, Medicare Supplement and Part D plans, review your coverage every year, and help with enrollment. We explain things in plain language, and you do not pay us directly for the guidance. We are paid by the insurance carrier when you enroll in a plan through us.

If you are deciding whether to change this year, our annual Medicare coverage review is a good place to start. When you are ready to act, see your next steps for Medicare enrollment.

Mistakes that cost people money

• Waiting until December 7 to start. Give yourself a week or two to compare and enroll, so a missed call or a slow form does not cost you a year.
• Choosing on premium alone. A $0 premium plan can cost more overall if your drugs sit on a high tier or your specialist is out of network.
• Dropping Medigap first. Once it is gone, getting it back may not be possible, or may cost more.
• Assuming a plan will carry over. Plans can change or leave your area at year end. Read your Annual Notice of Change every fall.
• Answering unsolicited calls. Plans cannot call you to sell coverage. Hang up, and report it to 1-800-MEDICARE.

FAQ

Can I change Medicare plans in the middle of the year?

Only if you qualify for a Special Enrollment Period. Common triggers include moving, losing other coverage, getting Medicaid or qualifying for Extra Help. If you are already in Advantage, you also have January 1 to March 31 to switch Advantage plans or return to Original Medicare.

When can I change my Part D plan?

The main window is October 15 to December 7, with the new plan starting January 1. Special Enrollment Periods can also allow a change during the year, depending on your situation. Always check your medications against the new plan’s drug list first.

How hard is it to switch Medicare plans?

Switching Advantage or Part D plans during open enrollment is usually simple: you compare, enroll in the new plan, and the old one ends. Medigap is the hard one, because outside certain windows an insurer can ask health questions and deny you.

Do I need to cancel my old plan before I switch?

Generally not. Enrolling in a new Advantage or drug plan ends the old one. The exception is Medigap, which you should keep until the new policy is approved and active.

Sources

• Joining a plan | Medicare.gov
• Understanding Medicare Advantage & Medicare Drug Plan Enrollment Periods
• Your Guide to Medicare Drug Coverage
• Choosing a Medigap Policy
• Your Yearly Medicare Review

Recommended

• Medicare Advantage vs. Medicare Supplement: what’s different?
• Medicare enrollment periods, explained simply
• Medicare Savings Programs: 2026 Limits and How to Apply
• Annual Medicare Coverage Review in Rockford, IL