how-to
How to Switch Medicare Plans: Steps for Open Enrollment
Last Updated: November 4, 2026
Quick Summary
To switch Medicare plans during open enrollment, confirm which enrollment window applies, review your current coverage and total costs, then verify that your doctors, hospitals, and pharmacies are in network. Check your prescriptions against each plan's formulary, compare plans on total yearly cost rather than premium alone, and submit your enrollment request before December 7.
- The Medicare Annual Enrollment Period runs from October 15 to December 7 each year.
- Changes made during the Annual Enrollment Period generally take effect January 1.
- Pull your plan's Annual Notice of Change each fall to see what is changing next year.
- Call the plan directly to confirm a provider is in network for the coming plan year.
- Save your confirmation number and verify your effective date after you enroll.
Table of Contents
- When Medicare Open Enrollment Takes Place and What You Can Change
- A Numbered Checklist: Steps to Switch Medicare Plans
- Step 1: Confirm Which Enrollment Window You Are In
- Step 2: Review Your Current Coverage and Total Costs
- Step 3: Verify Doctors, Hospitals, and Pharmacies
- Step 4: Check Your Prescription Drugs Against Each Formulary
- Step 5: Compare Plans on Total Cost, Not Premium Alone
- Step 6: Submit Your Enrollment Request and Confirm the Effective Date
- Step 7: Follow Up After You Enroll
- How to Compare Medicare Plans With a Total-Cost Worksheet
- Switching From Medicare Advantage to Original Medicare
- Can You Change Medicare Plans After Open Enrollment?
- Medicare Open Enrollment Phone Number and Where to Get Help
- What to Do After You Submit Your Enrollment Request
- Get Help Reviewing Your Plan Options Before the December 7 Deadline
- Frequently Asked Questions
When Medicare Open Enrollment Takes Place and What You Can Change
The Medicare Annual Enrollment Period runs from October 15 to December 7 each year (Open Enrollment). During this window, anyone with Medicare can change coverage for the following year. The steps to switch Medicare plans during open enrollment are straightforward, but the timing matters more than most people expect. The same mistake shows up again and again during this window: waiting until the last week.
Here is what you can change between October 15 and December 7:
- Move from Original Medicare to a Medicare Advantage plan (Part C)
- Move from Medicare Advantage back to Original Medicare
- Switch from one Medicare Advantage plan to another
Changes made during the Annual Enrollment Period generally take effect January 1.
A Numbered Checklist: Steps to Switch Medicare Plans
This checklist is the core of the process. Work through it in order. Skipping a step is how people end up with a plan that looks good on paper but fails in practice.
Step 1: Confirm Which Enrollment Window You Are In
Before you compare anything, confirm the window that applies to you. The Annual Enrollment Period runs October 15 through December 7, and changes made then take effect January 1. The Medicare Advantage Open Enrollment Period runs January 1 through March 31 and lets you make one change if you are already in a Medicare Advantage plan.
Step 2: Review Your Current Coverage and Total Costs
Start with what you already have. Pull out your current plan's Annual Notice of Change, which arrives each fall. It shows what is changing for next year. Look at your premium, deductible, copayments, and coinsurance. Add up what you actually spent on care this year, not what you expected to spend. That real number is your baseline for comparing anything new.
Step 3: Verify Doctors, Hospitals, and Pharmacies
Check that your doctors, hospitals, and pharmacies are in the network of any plan you are considering. Medicare Advantage plans use provider networks, and a doctor who took your plan last year may not take it next year. If you are checking a doctor's status, our guide on how to verify a doctor's network status in Florida walks through the exact questions to ask.
Step 4: Check Your Prescription Drugs Against Each Formulary
List every prescription you take, including dosage. Then check each drug against the plan's formulary, the list of covered medications. Confirm three things: that the drug is covered, what tier it sits in, and whether it needs prior authorization. A plan with a low premium can cost far more overall if one of your drugs sits in a high tier or is not covered at all.
Step 5: Compare Plans on Total Cost, Not Premium Alone
Build a side-by-side worksheet before you decide. Use the plan's Summary of Benefits to fill in the monthly premium, annual deductible, drug copays for your specific list, typical office visit copay, hospital stay cost, and out-of-pocket maximum. The bottom-line yearly estimate is the number that matters. A plan that costs more each month but caps your out-of-pocket costs lower can win if you have a heavy medical year.
Step 6: Submit Your Enrollment Request and Confirm the Effective Date
Once you have picked a plan, enroll through the plan's website, by phone, or with help from a licensed agent. Save your confirmation number. Then confirm your effective date, which should be January 1 for a change made during the Annual Enrollment Period. If you want a broader walkthrough of the enrollment process itself, our Medicare enrollment checklist covers every step from start to finish.
Step 7: Follow Up After You Enroll
Your work is not done when you hit submit. Watch for the new plan's member card, which should arrive before your effective date.
Watch out: If you enroll in a new Medicare Advantage or Part D plan, your old plan generally ends automatically, but a failed or incomplete request can leave you in your prior plan without your realizing it.
How to Compare Medicare Plans With a Total-Cost Worksheet
Comparing premiums alone is the most common mistake we see. A plan with a lower monthly premium can cost you more by the end of the year once you add up deductibles, copays, and drug costs.
| Cost Category | Current Plan | Plan A | Plan B |
|---|---|---|---|
| Monthly premium (x 12) | $ | $ | $ |
| Annual deductible | $ | $ | $ |
| Drug copays (your list) | $ | $ | $ |
| Typical office visit copay | $ | $ | $ |
| Hospital stay cost | $ | $ | $ |
| Out-of-pocket maximum | $ | $ | $ |
| Estimated yearly total | $ | $ | $ |
Fill in each column with real numbers from the plan's Summary of Benefits. The bottom row is the number that matters.
Switching From Medicare Advantage to Original Medicare
Leaving Medicare Advantage is allowed during open enrollment, but there is a catch most people miss. Original Medicare alone generally does not have an annual out-of-pocket maximum (What does Medicare cost?). Medigap has its own open enrollment period, a six-month window that starts when you first enroll in Part B at age 65 (Get ready to buy). If you are moving between Advantage plans instead, our guide on how to switch Medicare Advantage plans covers the plan-to-plan process in detail.
Can You Change Medicare Plans After Open Enrollment?
Generally, no. The December 7 deadline is firm for most people. But there are exceptions. A Special Enrollment Period can open a window outside the annual one when you have a qualifying circumstance, such as moving to a new service area, losing employer coverage, or your plan leaving the market. Our guide to the Medicare Special Enrollment Period explains which circumstances qualify and how to apply.
Medicare Open Enrollment Phone Number and Where to Get Help
Free help exists, and you should use it. The official Medicare helpline is 1-800-MEDICARE. You can also contact your State Health Insurance Assistance Program, which offers free, unbiased counseling. Licensed agents can walk you through plan comparisons in more detail. If you want local, in-person assistance, our Medicare enrollment help guide lists where to find it near you.
What to Do After You Submit Your Enrollment Request
Most guides stop at the submit button. The follow-through is where coverage problems actually surface, so treat this as its own set of steps.
Confirm the Request Was Received
Save your confirmation number and the date you enrolled. If you enrolled online, take a screenshot of the confirmation screen. If you enrolled by phone, write down the representative's name and the date. If you enrolled through a licensed agent, ask for a copy of the enrollment confirmation. A request that was never received is the same as a request you never made, so do not assume silence means success.
Verify Your Effective Date in Writing
Confirm the effective date the plan has on file. For a change made during the Annual Enrollment Period, that date should be January 1. For a change made during the Medicare Advantage Open Enrollment Period, it is typically the first of the month after the request is received. If the date you are told does not match the window you enrolled in, ask the plan to correct it before the window closes.
Watch for the Member Card and Welcome Materials
Watch your mailbox for the new plan's member card and welcome packet, which should arrive before your effective date. If you have not received a card by mid-December for a January 1 start, call the plan and confirm they show you as enrolled. Do not wait until January to chase a missing card, because the plan's customer service lines are busiest right at the start of the year.
Check Your First Explanation of Benefits
In January, review your first Explanation of Benefits to confirm the new plan is actually paying claims and that your cost sharing matches what the Summary of Benefits said. If a claim is denied or the cost sharing looks wrong, contact the plan immediately. Errors are far easier to fix in January than in March, and a pattern of denials early in the year can signal a network or formulary problem worth resolving before you rely on the plan for a major procedure.
Know What to Do If Something Went Wrong
If your request was rejected, if you were auto-enrolled into a plan you did not choose, or if you are unsure whether your request was received, call 1-800-MEDICARE and ask them to confirm your current enrollment.
Watch out: Anyone who asks for payment to "hold" a plan or pressures you to enroll on the spot is not giving you legitimate help.
Get Help Reviewing Your Plan Options Before the December 7 Deadline
The December 7 deadline does not move, and the plans that fit you best this year may not be the same ones that fit you last year. Formularies change, networks shift, and premiums adjust every fall. Your Medicare Agent Medicarehelpinfl offers clear, plain-language guidance on Original Medicare, Medicare Advantage, and supplemental plans, including information on eligibility and on avoiding coverage gaps and enrollment penalties. Review your plan options carefully before the deadline arrives.
Frequently Asked Questions
Can I switch Medicare plans during Open Enrollment?
Yes. The Annual Enrollment Period runs from October 15 to December 7 each year. During this window you can switch from Original Medicare to a Medicare Advantage plan, move from one Medicare Advantage plan to another, join or change a Part D prescription drug plan, or return to Original Medicare. Any change you make takes effect January 1. If you miss the December 7 deadline, you generally have to wait until the next Annual Enrollment Period unless you qualify for a Special Enrollment Period.
What is the biggest mistake to avoid when changing Medicare plans?
The most common mistake is choosing a plan on premium alone without checking whether your doctors, hospitals, and prescriptions are covered. A low monthly premium can cost you far more if your specialists are out of network or a drug you take is not on the formulary. Before you switch Medicare plans, confirm each provider and medication against the new plan's directory and drug list, and compare total yearly costs rather than the premium by itself.
When does my new Medicare plan coverage start?
If you enroll during the Annual Enrollment Period between October 15 and December 7, your new coverage generally begins January 1. Enrollments submitted after December 7 generally cannot take effect until the following plan year. If you qualify for a Special Enrollment Period, the effective date depends on your qualifying circumstance and when you submit the enrollment request, so confirm the start date with the plan before you rely on it.
How do I switch from Medicare Advantage to Original Medicare?
You can return to Original Medicare during the Annual Enrollment Period by enrolling in a stand-alone Part D plan, which ends your Medicare Advantage coverage on January 1. Before you switch, understand that Original Medicare generally does not have an annual out-of-pocket maximum, so some people consider a Medigap policy. Medigap enrollment rules apply, and outside the applicable windows an insurer may review your health before issuing a policy.
The deadline will arrive whether or not you are ready. Give yourself a few evenings this fall to work through the checklist, verify your doctors and drugs, and compare total costs rather than premiums alone. If any part of the process feels unclear, that is the moment to ask for help rather than guess.
