In general, you do not need to re-enroll in Medicare or switch plans every year. Most Medicare coverage renews automatically as long as your plan remains available and you continue paying required premiums. But automatic renewal does not mean your costs, benefits, or provider access stay the same. A yearly review helps you decide whether to keep your existing coverage or compare alternatives. Medicare.gov’s yearly review guide explains what to check.
Key Takeaways
Original Medicare (Parts A and B), Medicare Advantage, Part D, and Medigap plans typically continue from year to year without requiring re-enrollment, as long as you remain eligible and pay premiums on time.
Automatic renewal does not mean unchanged coverage. Premiums, copays, deductibles, drug formularies, and provider networks can all shift come January 1 of each new year.
You usually do not need to switch plans every year, but you should review your coverage each fall to decide whether you’ll keep your current plan, compare alternatives, or make a timely change.
Reviewing your Medicare plan annually helps ensure it meets your needs and can help you avoid unexpected costs.
Medigap Seminars offers no-cost coverage reviews and free quotes – with no obligation to change plans.
What Happens If I Do Nothing? (By Medicare Coverage Type)
If you take no action during the fall enrollment window, here is what typically happens for each part of your Medicare coverage:
Original Medicare (Parts A and B): Your coverage generally continues automatically each year as long as you remain eligible and pay any required premium. Not paying your Part B monthly premium can cause your coverage to end, and rejoining later may trigger a late enrollment penalty.
Medicare Advantage (Part C): If your Medicare Advantage plan is renewing its contract with Medicare for the following year and still serves your area, you usually stay enrolled in that same plan. However, Medicare Advantage plans can change premiums and benefits yearly-your copays, provider networks, covered services, and even prior authorization requirements may look different on January 1. In order to avoid being enrolled in dynamics you may not have preferred, it is worthwhile to make sure you know -beforehand- what the new year’s plan structure will entail.
Standalone Part D Drug Plans: These also renew automatically if still available in your area and as long as you keep paying premiums. But drug formularies can change annually, affecting coverage. A medication that was on a lower tier this year could move to a different tier next year, changing your prescription drug costs. Networks, copays, and monthly premiums can change per year as well, many times being less desirable than the previous year’s version, so it pays to stay aware of any upcoming changes.
Medigap (Medicare Supplement) Plans: Standardized Medigap policies must offer guaranteed renewal regardless of health. Health changes alone do not end your coverage, and a policy closing to new customers does not by itself end an existing policy. Limited exceptions include unpaid premiums, an untruthful application, or the insurer going out of business. See Medicare’s Medigap renewal rules. Guaranteed renewal does not lock your premium rates, though-prices may change, and the changes can occur throughout the year, not just on January 1st.
Employer or Retiree Coverage: If you also carry employer or retiree group insurance, your rules may differ. Always check with your benefits administrator before changing a Medicare plan on your own.
In most cases, doing nothing means you stay enrolled-but your costs and coverage for the following year may not match what you had this year.
Why You Should Review Your Medicare Plan Every Year (Even If You Don't Change)
The question is not just “Should I change Medicare plans?”, it is actually: “Should I keep, compare, or act?” A yearly review helps you answer that question confidently.
Here is why reviewing matters even when you expect to stay put:
Medicare plans can change premiums and coverage annually. Your plan’s benefits, monthly premium, copays, and rules may shift, especially for Medicare Advantage and Part D plans.
Your own health, prescriptions, or preferred doctors may have changed over the past year. A plan that worked well for you this year might not fit next year.
New plans may enter your area, and existing plans may leave or narrow their networks. Medicare Advantage networks can change from year to year.
What to check each year:
Total expected costs: review deductibles, copayments, coinsurance, and out-of-pocket limits, as well as monthly premiums.
Prescription drug costs: check your plan’s formulary to ensure specific medications are covered, at which tier, and with what restrictions.
Provider access: verify if your preferred doctors and hospitals are still in-network for your Medicare Advantage plan. Confirm the exact plan with both the insurer and the provider. With Original Medicare, check whether a provider accepts Medicare and whether they accept assignment- these are different questions, and the answers can affect billing.
A thorough review often confirms your current Medicare plan is still a good fit. Changing plans is not the default outcome-it is one possible outcome of a careful comparison.
How to Use Your Annual Notice of Change (ANOC) and Other Plan Mailings
If you have an annual plan, like Medicare Advantage or Part D, your plan will send an annual notice of change (ANOC) each fall, typically by September 30th. The ANOC summarizes what will change about your plan starting on January 1, including adjustments to premiums, deductibles, copays, coinsurance, covered benefits, rules (like prior authorization), and service areas.
The ANOC is not a complete formulary or provider directory. Use it as a starting point, then cross-check your specific medications, dosages, and preferred pharmacy against the plan’s full formulary. Review the provider directory to confirm your primary doctor and specialists remain in-network.
Watch for a different kind of notice: if your plan is leaving Medicare or exiting your area, you will receive a plan non-renewal notice, which is separate from the ANOC. Read the notice for your specific options, any planned transition, and deadlines; you may need to actively choose replacement coverage. Note: Do not just assume that you will automatically be placed into an equivalent plan.
Use our guide How to Read Your Medicare Annual Notice of Change 2027 for a step-by-step walkthrough of your plan materials.
When You Probably Don't Need to Change Your Medicare Plan
Changing plans every year is not necessary. The point of Medicare open enrollment is to confirm that your coverage still fits-not to hunt for something new every fall, especially if you have a Medigap plan. Here are scenarios where staying enrolled in your current plan likely makes sense:
Your ANOC shows only minor, manageable cost changes, and your total expected spending still fits your budget.
All your important prescriptions remain covered, on similar tiers, at pharmacies you are comfortable using.
You use Original Medicare with a Medigap plan, and are content with it.
Your key doctors, specialists, and hospitals are still in-network for your Medicare Advantage plan.
You have compared alternatives using the Medicare Plan Finder and none offers a clearly better combination for your unique needs.
A note on keeping your Medigap plan: Switching Medigap coverage outside of your initial open enrollment period can require medical underwriting, and acceptance is not guaranteed in many states. Consider whether switching could affect access to supplementary insurance later. If you are content with your current Medigap policy and can afford the premium, staying often makes more sense than chasing a slightly lower price. For more on timing and rights, click here: Medicare Supplement Enrollment Period.
Before replacing coverage, confirm acceptance and effective dates. Do not cancel an existing Medigap policy before you have been accepted for, or decided to keep, the replacement; coordinate any free-look period and/or overlapping premiums with the insurer. See: Medicare’s switching guidance.
Signs It May Be Time to Compare or Change Medicare Plans
Sometimes certain changes make your current plan a poor fit. Here are the most common signals:
Health and chronic conditions: New diagnoses, upcoming surgeries, or managing chronic conditions like diabetes may change which plan is most cost-effective. Changes in healthcare needs may require a different Medicare plan. Before considering a move to Original Medicare with Medigap, check whether you will be able to obtain the Medigap coverage you want.
Prescription drug changes: If you have started new medications or your drug list has grown more complex, your current prescription drug coverage may no longer minimize costs. Many Medicare Advantage plans provide built-in prescription drug coverage, but coverage details vary. Cross-check every medication against the new year’s formulary and tiers. See How to Compare Medicare Part D Plans for guidance.
Doctor and provider changes: If you have changed your primary doctor or started with new specialists, confirm they are in your plan’s network for the coming year. Switching may result in loss of embedded benefits from existing plans, so ensure coverage for doctors, hospitals, and prescriptions before making a move.
Costs: Significant premium increases, higher copays, or a much higher maximum out-of-pocket limit on a Medicare Advantage plan are good reasons to compare options. Lower costs can sometimes be realized by switching to plans with reduced premiums-but always evaluate total annual costs, not just the monthly premium. Medicare Advantage plans may also require prior authorization for certain services, which can affect how you access care.
Life changes and location: If you have recently moved, split time between states, or plan more travel, a local Medicare Advantage plan may no longer cover the areas where you regularly get care. Some people in these situations find Original Medicare plus a Medigap plan more flexible, but choices depend on budget, financial goals, and available plans.
If any of these criteria apply, it is worth comparing options during the Annual Enrollment Period or contacting licensed agents at Medigap Seminars for a personalized review.
Key Medicare Enrollment Periods for Reviewing or Changing Plans
You can review your Medicare plan at any time during the year, but acting on a change requires the right window. Medicare Advantage and Part D changes generally require an enrollment period. Medigap applications follow different rules and can be made outside the fall window, though acceptance may depend on underwriting or a protected right.
Annual Enrollment Period (AEP): Runs every year from October 15 through December 7. You can make changes during the Annual Enrollment Period, and those changes take effect January 1 of the following year. During AEP you may join, drop, or switch Medicare Advantage plans; join, drop, or switch standalone Part D prescription drug plans; or move between Original Medicare and Medicare Advantage. Note that Medigap enrollment has separate rules.
Medicare Advantage Open Enrollment Period (MA-OEP): From January 1 to March 31, people already enrolled in a Medicare Advantage plan can switch to another Medicare Advantage plan or drop Medicare Advantage and return to Original Medicare, adding a Part D plan if needed. If you miss the December 7 deadline, options may remain until March 31 through this window-but only if you are already in a Medicare Advantage plan. This is not a universal enrollment period for standalone drug plan changes.
Special Enrollment Periods (SEPs): These are triggered by specific life events, like moving out of your plan’s service area, your plan leaving Medicare, losing other creditable coverage, qualifying for Medicaid or Extra Help, or certain changes in residence. When a plan ends or you move, you may have a limited-time chance to change coverage outside the fall open enrollment window. Contact Medicare or your plan to confirm your applicable SEP and deadlines.
Medigap enrollment and changes: The Annual Enrollment Period for Medicare Advantage and Part D does not automatically create a no-underwriting Medigap open enrollment. Medigap has its own enrollment periods and rights, which vary by state. See Medicare Supplement Enrollment Period for more detail on enrollment rules and timing.
Special Situations: Extra Help, Medicaid, Employer Coverage, and Moving
Some circumstances change the usual rules.
Medicaid and Extra Help: Many beneficiaries with both Medicare and Medicaid, or who receive Extra Help with prescription drug costs, may have additional chances during the year to switch Medicare Advantage or Part D plans. These assistance programs have eligibility processes separate from Medicare enrollment. Follow any eligibility-review notices from your state Medicaid agency, Medicare, or Social Security; do not assume that Medicare’s continued enrollment renews every assistance benefit.
Employer or retiree coverage: If you carry employer, union, or retiree coverage alongside Medicare, speak with your benefits administrator before changing any Medicare plan. Dropping employer or retiree coverage can sometimes be permanent and may affect dependents.
Moving or new residence patterns: Moving out of a Medicare Advantage or Part D plan’s service area typically creates a Special Enrollment Period, but you must act within specific timelines. People who split time between states should evaluate whether their Medicare Advantage plan covers the areas where they regularly get care, or whether the flexibility of Original Medicare plus Medigap coverage may be a better fit.
Seek personalized advice in any of these situations-the right choice depends heavily on state rules, local plan availability, and your budget.
Step-by-Step: How to Review Your Medicare Coverage Each Year
Use this checklist to decide whether to keep or change your Medicare plan:
Gather your information: Collect your Medicare card, list of doctors and specialists, preferred hospitals, complete prescription list with dosages and frequency, and your preferred pharmacy. Pull your plan’s most recent ANOC, formulary, and provider directory.
Review your current year’s actual use: Look back at the care you used-doctor visits, hospital stays, diagnostic tests, and prescription fills. Identify patterns like frequent specialist visits or high spending on medications.
Compare next year’s changes: Check your ANOC for changes in premiums, deductibles, copays, networks, and key benefits. Cross-check each drug, dosage, and quantity against the updated formulary, including tiers, prior authorization, step therapy, quantity limits, and preferred pharmacies. Check the coming year’s drug deductible and cost sharing. The Part D drug spending limit is separate from a Medicare Advantage plan’s medical out-of-pocket maximum. Look up your doctors and hospitals in the next-year provider directory.
Use official comparison tools: Compare how other Medicare Advantage or Part D plans in your area stack up using the Medicare Plan Finder. Medigap Seminars can also provide side-by-side comparisons tailored to your zip code.
Decide: keep, compare further, or act now. If your current coverage still serves your health, prescription drug costs, and budget, staying enrolled is a valid and informed choice. If you are unsure, schedule a free review with a licensed Medigap Seminars agent-no pressure to switch.
For a structured step-by-step review, see the Annual Enrollment Period checklist at MedicareChecklist.com (opens in a new tab). Select your current coverage type to see review steps relevant to you. Using the checklist does not obligate you to switch plans or waive any underwriting requirements.
Get Help With Your Annual Coverage Review
Contact Medigap Seminars to discuss your coverage, costs, and questions before making a change. A review can lead to keeping your current coverage, comparing alternatives, or possibly changing only one aspect of your coverage.
Frequently Asked Questions
Once you are enrolled in Original Medicare (Part A and Part B), your coverage typically continues automatically from year to year as long as you remain eligible and pay any required premiums. You do not file a new application just because another year has passed. However, you should still review whether your Medicare Advantage, Part D, or Medigap plan is still the right fit each fall, since your healthcare needs may change, affecting plan suitability.
Standardized Medigap policies must offer guaranteed renewal regardless of health. Your policy generally continues as long as you pay the premiums, subject to the limited exceptions explained above. You do not need to reapply, and your health changes alone are not a reason the insurer can drop you-though premiums may very well change and increase over time.
If you have Original Medicare with or without a Medigap plan, you can generally switch to a standalone Prescription Drug Plan during the Annual Enrollment Period without changing your other coverage. A new Part D enrollment typically replaces your old drug plan on January 1, so make sure you are comfortable with the new plan’s formulary and pharmacy network before switching.
If a plan will no longer be offered, your plan or Medicare will send notices explaining that coverage is ending and outlining deadlines and options. Do not ignore these letters-you may need them in order to enroll in a new plan or consider returning to Original Medicare and adding other coverage during a Special Enrollment Period which is tied to the plan ending.
You are not required to change plans just because your premium increases. You can stay enrolled and accept the new cost if the plan still meets your needs. Any significant premium increase is a good reason to compare alternatives during the Annual Enrollment Period, but the decision to keep or switch should be based on total coverage and costs-not premium alone.
