Medicare Advantage vs Medigap in 2027: the honest comparison, including the trap nobody mentions
Both are legitimate choices and either can be right for you. What almost no comparison tells you is that the decision is far easier to make than it is to undo, and the reason is medical underwriting.
The short answer
Medicare Advantage bundles your coverage into one private plan with a network, usually at a lower monthly cost. Medigap pays your share of Original Medicare, works with any doctor who takes Medicare, and costs more each month. The decision is not symmetric: moving from Medigap to Medicare Advantage is always allowed, while moving back can require passing medical underwriting.
- The asymmetry: You can switch to Medicare Advantage any year. Switching back to Medigap can require health underwriting and you can be declined.
- Trial right: If this is your first Medicare Advantage plan, you have 12 months to return to Medigap without underwriting.
- State rules matter: CT, NY, MA and ME limit or bar underwriting. Sixteen states have a birthday rule, with New Mexico joining January 1, 2027.
- Deadline: Changes made during the Annual Enrollment Period, October 15 to December 7, 2026, take effect January 1, 2027.
Applies to anyone choosing between a Medicare Advantage plan and a Medicare Supplement policy, whether you are new to Medicare or considering a change during the Annual Enrollment Period.
What is the actual difference?
They solve the same problem in opposite ways.
Original Medicare pays most of your hospital and medical costs and leaves you responsible for a share with no annual limit. Medigap is a private policy that pays that share. You keep Original Medicare, you can see any doctor in the country who accepts it, and you add a standalone Part D plan for drugs.
Medicare Advantage replaces the way Original Medicare delivers your benefits. A private plan takes over, usually with a network, usually with drug coverage included, often with extras like dental or a fitness benefit. It has an annual out-of-pocket maximum, which Original Medicare alone does not.
| Medicare Advantage | Original Medicare + Medigap | |
|---|---|---|
| Monthly cost | Often $0 beyond Part B | Part B plus a Medigap premium, commonly $120 to $300 |
| Costs when you use care | Copays per visit and service, up to a yearly maximum | Usually little or nothing, depending on the plan letter |
| Doctor choice | Network. Out of network costs more or is not covered | Any provider who accepts Medicare, nationwide |
| Referrals and prior authorization | Common, varies by plan | Rare under Original Medicare |
| Drug coverage | Usually included | Separate Part D plan required |
| Extras | Dental, vision, hearing, OTC allowance are common | Not included |
| Travel | Limited outside the service area | Works anywhere in the country |
| Changing your mind later | You can join any year | May require medical underwriting |
The part most comparisons skip
The two directions are not equally open, and this is the single most important thing on this page.
Going from Medigap to Medicare Advantage is always available. Any year, during the Annual Enrollment Period, you can drop your supplement and take an Advantage plan. Nobody asks about your health.
Going the other way can require passing medical underwriting. The insurer reviews your health history and can decline you, charge more, or exclude a condition. Conditions that commonly cause trouble include heart disease, diabetes with complications, COPD, cancer within recent years, kidney disease and stroke history.
So the choice you make at 65 is easy to change in one direction and potentially permanent in the other. Nobody explains that when the $0 premium is on the table, because the premium is the part that sells.
When can you switch back without underwriting?
There are real protections. They are narrow and they are time-limited.
| Situation | What it gives you | Timing |
|---|---|---|
| Trial right, first Medicare Advantage plan | Guaranteed-issue Medigap, no health questions | Within 12 months of joining |
| You dropped a Medigap policy to try Medicare Advantage | Right to return to that policy if still sold | Within 12 months |
| Your plan leaves Medicare or exits your county | Guaranteed issue on certain plans | Generally 63 days from coverage ending |
| You move out of the plan’s service area | Guaranteed issue on certain plans | Generally 63 days |
| Employer or union coverage ends | Guaranteed issue on certain plans | Generally 63 days |
Two details decide whether these actually help you. The trial right is once in a lifetime, and it only applies the first time you try Medicare Advantage. And the 63-day clock is strict: you generally apply no earlier than 60 days before the old coverage ends and no later than 63 days after. Missing that window forfeits the protection even if you are still inside the 12 months.
Does your state change the answer?
Substantially, and this is where blanket advice falls apart.
A handful of states limit or prohibit Medigap underwriting outright. Connecticut, New York, Massachusetts and Maine offer year-round or continuous protections, so in those states the asymmetry above barely applies.
Sixteen states have a birthday rule: a window each year, usually 30 to 63 days around your birthday, when an existing Medigap policyholder can move to an equal or lesser plan without underwriting. New Mexico’s takes effect January 1, 2027, and West Virginia’s began in 2026. Window lengths and the rules about which plans you can move to vary widely.
Most states have neither. There, the general rule applies, and the decision really is close to one-way after your protections expire. Rules change by legislative session, so verify with your state’s department of insurance before you rely on one.
So who is each one actually for?
Medicare Advantage tends to fit someone whose doctors are already in a plan’s network, whose health is stable, who does not travel much, who values the extras, and who would rather keep monthly costs low and pay copays as care happens.
Medigap tends to fit someone who wants any doctor without referrals, who travels or splits the year between states, who has a condition that makes future underwriting unlikely to go well, or who simply wants a known monthly number instead of a variable one.
The honest framing is not which plan is better. It is which risk you would rather carry. Medicare Advantage moves cost from the premium line to the usage line. Medigap does the reverse. In a healthy year, Advantage usually wins on total cost. In a bad year, Medigap usually does.
Five questions that settle it faster than a comparison chart
- Are your doctors and your hospital in the plan’s network for 2027, confirmed with their office rather than the plan directory?
- Does the plan cover your medications, at what tier, and with what restrictions? Check your actual list at Medicare.gov.
- Does your state have a birthday rule or continuous open enrollment, and are you inside a trial right?
- If you were diagnosed with something serious next year, what would your out-of-pocket cost look like under each option?
- Do you spend months at a time outside your plan’s service area?
What about cost over five years?
Run it both ways rather than comparing premiums.
Take a Medigap premium of $180 a month. That is $2,160 a year, or $10,800 over five years, plus a Part D plan, and in most years you pay little else for covered services. Take a $0 premium Advantage plan with a $5,500 maximum out-of-pocket. In four quiet years you might spend $1,000 a year in copays, then in the fifth year you have a serious illness and hit the maximum. That is roughly $9,500 over the same five years.
The totals land close. What differs is where the money sits and whether you can plan around it. Those are illustrations, not quotes, and your real numbers depend on your plan, your state, and your health.
One more thing that changed for 2027: the federal subsidy that held down standalone drug plan premiums ended after 2026, which affects the Part D side of the Medigap route. We explained it in why your 2027 Part D premium is going up.
How do you make the change?
During the Annual Enrollment Period, October 15 to December 7, with coverage starting January 1. The mechanics and the narrower January window are covered in our guide to the Annual Enrollment Period.
If you are moving from Medicare Advantage to Medigap, apply for the Medigap policy and get accepted before you disenroll from the Advantage plan. Doing it in the wrong order can leave you with neither.
Before any of this, read your Annual Notice of Change. Sometimes the plan you are unhappy with did not change at all, and sometimes the plan you are happy with did. Start with the facts rather than the advertising, and see our Medicare page if you want to talk it through.
Questions people ask
Which is better, Medicare Advantage or Medigap?
Neither is better in general. Medicare Advantage costs less monthly and works well if your doctors are in network and your health is stable. Medigap costs more monthly and protects you when your health is not stable. The right answer depends on your doctors, your prescriptions, whether you travel, and what you want a bad year to look like.
Can I switch from Medicare Advantage back to Medigap?
You can always leave Medicare Advantage. Whether a Medigap insurer must accept you is a separate question. Within your first 12 months in Medicare Advantage you have a trial right and cannot be turned down. Outside that, most states allow medical underwriting.
What is medical underwriting?
The insurer asks about your health history and can decline you, charge more, or exclude conditions. Heart disease, diabetes with complications, COPD, recent cancer, kidney disease and stroke history commonly cause problems. Criteria vary by carrier, so a decline from one is not a decline from all.
Does Medigap cover prescription drugs?
No. Medigap policies sold today do not include drug coverage. You buy a standalone Part D plan alongside it. Most Medicare Advantage plans include drug coverage in the plan.
What is the birthday rule?
A state protection that lets existing Medigap policyholders switch to an equal or lesser plan without underwriting during a window around their birthday. Sixteen states have one. New Mexico's takes effect January 1, 2027. Window lengths and conditions vary.
Is Medigap worth the higher premium?
It depends on what you are buying it for. You are paying a known monthly amount to avoid an unknown annual amount, and to keep the freedom to see any doctor who accepts Medicare. For someone with stable health and in-network doctors, that premium may buy little. For someone facing a serious diagnosis, it can be the difference between predictable costs and a year of surprises.
Sources
- Medicare.gov, When can I buy Medigap?, accessed September 17, 2026
- Medicare.gov, Medigap guaranteed issue rights, accessed September 17, 2026
- Medicare.gov, Joining a health or drug plan, accessed September 17, 2026
- CMS, Medicare Part D 2027 National Average Monthly Bid Amount Information, July 28, 2026
Not sure which side of this you belong on?
Send your doctors, your medication list, and your state. A licensed advisor will tell you which option fits, what it would cost over a year, and whether the decision is reversible in your state. One business day, no cost.
Get my comparisonCall or text (773) 657-9140Smart Insurance Agents LLC is an independent, licensed insurance agency and is not connected with or endorsed by the U.S. government or the federal Medicare program. We do not offer every plan available in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Assistance Program for information on all of your options. Content is for general information and is not a guarantee of coverage or rates; figures are subject to change by CMS and carriers.