If you have a Medicare Advantage plan and this year you noticed more prior authorizations, a tighter network, or extra benefits that were cut, you may be wondering whether it makes sense to go back to Original Medicare and add a Medigap supplement. It is an important decision, and there is an underwriting window that almost no one explains, one that can be the difference between locking in a good price or being denied a policy.
In this guide we walk you through it in plain language: the real difference between the two paths, why more people are considering the switch in 2026, when it makes sense to stay where you are, and what steps to take so you can evaluate your move without leaving yourself unprotected.
The key difference: Medicare Advantage vs Original Medicare + Medigap
Before you think about switching, it helps to understand that you are comparing two different ways of receiving your Medicare benefits. It is not only about price, but about how you access your doctors and your services.
How each one works: networks, cost sharing, and prior authorization
A Medicare Advantage plan (the private side of Medicare, also called Part C) usually works with a network of doctors and hospitals. Inside that network you pay less; outside of it you pay more or have no coverage. Many services require prior authorization, meaning the plan has to approve the service before you receive it. In exchange, these plans tend to have low monthly premiums and sometimes include extra benefits.
With Original Medicare plus a Medigap supplement, you can go to any doctor or hospital in the country that accepts Medicare, with no network and generally no prior authorization. Medigap helps pay part of the costs that Original Medicare leaves you (deductibles, copays, and coinsurance), which makes your spending more predictable. In exchange, you usually pay a higher monthly premium.
What Medigap covers and what it does not
One point that confuses many people: Medigap does not include prescription drug coverage. If you move to Original Medicare with Medigap, you need to enroll separately in a Part D plan for your medications. It also does not automatically cover things like dental, vision, or hearing, which some Medicare Advantage plans do offer as extras.
Why more people are considering the switch in 2026
In 2026, several Medicare Advantage plans adjusted what they offer. In many cases there were cuts or a reshuffle of supplemental benefits, such as the grocery card or the over-the-counter allowance. If you want to see that topic in detail, we cover it in our guide on the benefit cuts in Medicare Advantage for 2026.
At the same time, some people report heavier use of prior authorization, which can mean more steps and waits to get certain services approved. When the extra benefits that drew you to a plan shrink, or when the network and approvals start to feel limiting, it is natural to look at the other path: Original Medicare with a Medigap policy that brings fewer surprises in your costs.
The underwriting window almost no one explains
Here is the part many people discover too late. When you turn 65 and enroll in Part B, your Medigap open enrollment period opens, and it usually lasts six months. During that window you have guaranteed issue: the insurer must sell you a Medigap policy regardless of your health and cannot raise the price because of medical conditions.
Outside that window the situation changes. In many cases, buying a Medigap policy may require medical underwriting, meaning the insurer can ask health questions and, depending on your answers, deny the policy or charge you more. That is why returning to Original Medicare does not, on its own, guarantee that you will get a Medigap policy at a good price.
There are also guaranteed issue rights in specific situations, but these rules have a federal part and a state part that varies by state. What applies to someone in one state may not apply to you in another. Before you decide, check your case on Medicare.gov and with your state Department of Insurance (DOI), or ask a licensed agent to review it with you.
When does it make sense to stay in Medicare Advantage?
Switching is not always the best move. Staying in your Medicare Advantage plan can make sense if your monthly budget is tight and you value a low premium, if the extra benefits your plan still offers are useful to you, or if your doctors are in network and you are happy with your care.
Your health situation matters too. If, outside your guaranteed issue window, a Medigap policy could be expensive or hard to get because of medical underwriting, it may be worth comparing carefully before you move. The best option is not the same for everyone; it depends on your medications, your doctors, your state, and how much care you use.
Steps to evaluate your switch without losing coverage
If you are thinking about switching, do it in an orderly way so you do not end up without coverage or lose money:
- Review what changed in your current plan. Read your Annual Notice of Change (ANOC) to see what changed in benefits, network, and costs for 2026.
- Confirm your Medigap situation. Find out whether you are inside your open enrollment period or whether you would have to go through medical underwriting, and check your state rules on Medicare.gov.
- Compare the total cost, not just the premium. Add up premium, deductibles, copays, and the separate Part D plan you will need with Medigap.
- Do not cancel anything yet. Make sure you are approved for the Medigap and the Part D plan first, before leaving your current plan, so you do not end up with a coverage gap.
- Use the right window. Remember that to return to Original Medicare there are periods like the MA-OEP (January 1 to March 31) and the AEP (October 15 to December 7).
Talk to a bilingual agent before you cancel anything
The choice between Medicare Advantage and Original Medicare with Medigap depends on many personal details: your health, your state, your doctors, and your budget. A licensed agent can review with you what changed in your plan, confirm which window you are in, explain how medical underwriting works in your state, and compare your real options for 2026. This service is free for you.
If you want someone to review your situation and show you your real options for 2026, you can request your quote here and a licensed bilingual agent will guide you with no obligation, before you cancel anything.
Frequently asked questions
Can I switch from Medicare Advantage to Medigap whenever I want?
You can return to Original Medicare during windows like the MA-OEP (January 1 to March 31) or the AEP (October 15 to December 7), but buying a Medigap supplement outside your open enrollment period may require medical approval. Going back to Original Medicare and getting a Medigap policy do not always happen at the same time, so it is wise to review your case before you cancel anything.
Do I need a medical exam for Medigap?
There is usually no physical exam, but outside your guaranteed issue window the insurer can ask health questions (medical underwriting) and, depending on your answers, deny the policy or adjust the price. During your Medigap open enrollment period they cannot turn you down because of your health.
What are guaranteed issue rights?
They are specific situations in which an insurer must sell you a Medigap policy without considering your health. There are federal rules and state rules that vary by state, so what applies in one state may not apply in another. Check your situation on Medicare.gov and with your state Department of Insurance (DOI).
Does Medigap cover my prescriptions?
No. Modern Medigap policies do not include prescription drug coverage. If you move to Original Medicare with Medigap, you need to enroll separately in a Part D drug plan for your pharmacy coverage.
What is the best window to switch?
Ideally your Medigap open enrollment period, which usually starts when you are 65 or older and enroll in Part B. During that period issue is guaranteed. Outside of it, evaluate with an agent so you do not run out of options, because the insurer may use medical underwriting.
Is Medigap more expensive than Medicare Advantage?
It usually has a higher monthly premium than many Medicare Advantage plans, but in exchange it offers more predictable costs when you use medical services. Which one suits you depends on your state, your health, your budget, and how much care you use.
