Why Retirees Pay $200 a Month for Medigap When Medicare Advantage Can Cost $0
At first glance, the comparison seems almost irrational. A retiree may be able to enroll in a Medicare Advantage plan charging no additional monthly premium, while someone across the street willingly pays $150, $200 or more every month for a Medicare Supplement policy in addition to the standard Medicare costs both people already face. Over a decade, those Medigap premiums can add up to tens of thousands of dollars, even during years when the policyholder uses relatively little medical care.
The reason is that the two approaches are selling different kinds of financial protection. Medicare Advantage can lower fixed monthly expenses by placing more of the cost and administration around healthcare into the years when services are actually used. Original Medicare paired with Medigap generally requires a higher predictable premium in exchange for broader provider access and substantially less exposure to routine Medicare cost sharing, depending on the supplement selected. The decision is therefore not simply whether someone wants to pay $0 or $200 a month; it is how much certainty, provider flexibility and future optionality the retiree is willing to purchase.
A $0 Premium Does Not Mean Free Healthcare
Medicare Advantage advertising frequently emphasizes $0-premium plans, and those plans are real. The terminology can nevertheless be confusing because beneficiaries generally must continue paying their Medicare Part B premium, and a $0 Medicare Advantage premium does not eliminate copayments, coinsurance or other expenses when medical care is used. Plans can charge different amounts for physician visits, hospital stays, outpatient procedures, diagnostic tests and other covered services.
The financial protection comes from an annual maximum out-of-pocket limit for services covered under Medicare Parts A and B. In 2026, the average enrollment-weighted in-network maximum among Medicare Advantage plans is $5,421, while PPOs average $9,825 when in-network and out-of-network spending is combined. Federal rules allow 2026 limits as high as $9,250 for in-network Part A and B expenses and $13,900 for combined in- and out-of-network expenses, although many plans establish lower limits.
That structure can be attractive when healthcare use is modest. Someone could spend relatively little beyond the Part B premium during a healthy year while also receiving supplemental benefits such as dental, vision, hearing or fitness coverage. A serious illness can produce a dramatically different year, however, because repeated copayments and coinsurance can move the enrollee much closer to the plan’s out-of-pocket ceiling. The appropriate comparison is therefore not the Medigap premium versus a Medicare Advantage premium alone, but the range of costs each arrangement could generate over many years.
Medigap Is Essentially a Decision to Prepay More of the Risk
Medigap works differently because it supplements Original Medicare rather than replacing the way Medicare benefits are administered. Original Medicare pays its share of covered services first, and the Medigap policy then pays according to the standardized benefits of the particular supplement. Depending on the plan, that can make annual medical expenses considerably more predictable even though the retiree pays a supplement premium every month.
This is why someone can remain satisfied paying thousands of dollars annually for a Medigap policy during years with few medical problems. The premium is purchasing insurance against the possibility of a much more expensive year and reducing uncertainty around what medical care will cost. It is similar to other forms of insurance: The fact that someone did not file a large claim does not necessarily mean the premium was wasted, because part of what was purchased was protection from the risk itself.
Medicare Advantage keeps more of that risk with the beneficiary. Fixed premiums can be much lower, but more expenses appear when services are consumed. Neither arrangement is inherently financially superior; one emphasizes lower fixed costs and an annual limit on medical spending, while the other can require considerably higher recurring premiums in exchange for more predictable cost sharing.
What Medigap Buyers Are Often Really Purchasing Is Access
The biggest difference may not be financial at all. Original Medicare allows beneficiaries to receive covered care from any doctor or hospital that participates in Medicare, without being limited to a Medicare Advantage plan’s particular network. That can become increasingly valuable for retirees who travel frequently, maintain homes in different states or want the ability to seek care at specialized medical centers.
Medicare Advantage networks vary significantly by plan and location. HMOs typically require beneficiaries to use network providers for most nonemergency care, while PPOs usually provide some out-of-network coverage at higher cost. KFF’s 2026 analysis found that Medicare Advantage beneficiaries have access, on average, to about half of the physicians available to traditional Medicare beneficiaries in their local areas, although actual networks can be considerably broader or narrower depending on the plan.
A healthy 65-year-old may reasonably decide that a strong local network provides every doctor likely to be needed. The value calculation can change after a complicated cancer diagnosis, neurological condition or major surgery, when the patient wants a particular specialist who happens to be outside the network. Paying a higher Medigap premium is therefore partly a decision to purchase greater freedom over where future care can be obtained.
Prior Authorization Is Another Part of the Price Difference
Original Medicare does not generally require prior authorization for most covered services, although there are limited exceptions and new demonstration programs are testing broader authorization for selected services in certain areas. Medicare Advantage uses prior authorization far more extensively as a tool to manage utilization and costs. In 2026, 99% of Medicare Advantage enrollees are in plans requiring prior authorization for at least some services.
The requirements are concentrated heavily in more expensive care. KFF found that 97% of Medicare Advantage enrollees are in plans requiring authorization for acute inpatient hospital stays, 95% for skilled nursing facility stays, 94% for Part B drugs and 90% for home health services. In 2024, insurers processed nearly 53 million Medicare Advantage prior-authorization requests and denied 7.7% in whole or in part, although more than 90% were fully approved.
Medigap itself does not ordinarily impose a separate prior-authorization layer on top of Original Medicare. If Medicare approves and covers the service, the supplement generally pays its contractual share according to the standardized plan benefits. That administrative simplicity is difficult to price in advance, but some retirees are willing to pay higher monthly premiums specifically because they do not want an insurer routinely inserted between the Medicare coverage decision and the supplemental payment.
Prior authorization also serves a legitimate purpose by attempting to limit unnecessary or low-value care, so its existence does not mean a request will be denied or delayed improperly. The tradeoff is that a managed-care system gains some of its cost advantage precisely because the insurer actively manages utilization, while Original Medicare with Medigap offers a less restrictive structure.
Medicare Advantage Has Become the Majority Choice for a Reason
Medigap’s advantages should not obscure the enormous appeal of Medicare Advantage. In 2026, roughly 55% of eligible Medicare beneficiaries are enrolled in Medicare Advantage, reflecting two decades of steady growth. For millions of retirees, particularly those living on limited fixed incomes, paying an additional Medigap premium every month may simply be unattractive or unaffordable.
Advantage plans can package Medicare medical benefits and usually prescription drug coverage into one plan while providing additional benefits Original Medicare generally does not include. Dental, vision and hearing coverage can have real value, as can transportation, fitness benefits and reductions in the Part B premium offered by some plans. A beneficiary comfortable with the provider network may reasonably conclude that lower monthly expenses and additional benefits outweigh the possibility of higher cost sharing when medical needs increase.
That decision should not be framed as choosing inferior insurance because someone cannot afford Medigap. Medicare Advantage plans must cover the medically necessary services covered by Original Medicare, subject to Medicare rules, and the annual maximum out-of-pocket limit provides protection that Original Medicare by itself does not offer. The important distinction is that the consumer needs to understand what is being traded for the lower premium.
Medigap Premiums Purchase Predictability, Not Permanently Fixed Pricing
Another misconception is that buying Medigap locks in one premium for life. Medigap policies are generally guaranteed renewable, meaning an insurer ordinarily cannot cancel coverage as long as the beneficiary continues paying the premium and complies with the policy terms. The coverage can therefore remain in force year after year rather than depending on the insurer deciding whether that individual remains profitable.
The premium, however, is not guaranteed to remain unchanged. Medigap rates can increase over time because of the insurer’s pricing method, medical costs, inflation and state insurance rules. Two retirees who purchased the same standardized Plan G from different insurers can also experience different premium histories even though the core medical benefits are standardized.
This distinction matters when projecting retirement costs. Someone paying $180 a month today should not assume that $2,160 annual cost will remain flat for the next 20 years. The benefit of Medigap is greater predictability around covered medical cost sharing and continued access to the policy, not permanent protection from insurance-premium increases.
Medicare Advantage Requires More Annual Maintenance
Medicare Advantage is fundamentally an annual managed-care arrangement. Plans can change premiums, benefits, drug formularies, copayments and provider networks from one year to another, and insurers can withdraw plans from particular markets. Beneficiaries receive annual notices explaining changes and have opportunities during Medicare’s enrollment periods to reconsider their coverage.
The main Medicare Open Enrollment period runs from October 15 through December 7, when beneficiaries can change Medicare Advantage or prescription drug coverage for the following year. People already enrolled in Medicare Advantage also have a Medicare Advantage Open Enrollment Period from January 1 through March 31, during which they can make one permitted change, including returning to Original Medicare under applicable rules.
That flexibility is valuable, but it creates responsibility. Someone who enrolls in a plan at 65 and ignores it for the next decade could discover that a preferred physician left the network or that a medication became more expensive. Medicare Advantage works best when beneficiaries are willing to review coverage periodically rather than assuming this year’s plan will remain identical indefinitely.
Medigap tends to require less annual management because standardized medical benefits do not reset each year in the same fashion. A Plan G remains a Plan G as long as the policy remains in force, although premiums can rise and prescription drug coverage must generally be handled separately through Part D.
The Biggest Switching Risk Appears After Your Health Changes
One of the most important Medicare misconceptions is that a beneficiary can simply use a low-cost Medicare Advantage plan while healthy and switch to Medigap later when more comprehensive supplemental coverage becomes desirable. Returning to Original Medicare may be possible during an eligible enrollment period, but obtaining the desired Medigap policy is a separate question.
The strongest federal protection generally occurs during the six-month Medigap Open Enrollment Period that begins when someone is at least 65 and enrolled in Part B. After that protected period, insurers in many states may use medical underwriting unless the applicant qualifies for a guaranteed-issue right or state law provides additional protections. Medicare warns that beneficiaries outside protected enrollment periods may face fewer options or higher costs, and in some circumstances they may not be able to purchase the desired policy.
That creates an asymmetry in the original Medicare decision. A healthy 65-year-old who chooses Medigap can generally keep the policy as long as premiums are paid. Someone who chooses Medicare Advantage may later decide that Original Medicare and Medigap would better suit a complicated medical situation, but access to a new supplement cannot always be assumed.
This is one of the reasons the initial decision should consider future health uncertainty rather than only current healthcare use. Insurance is most valuable after the risk has appeared, yet that can also be the point when switching into certain forms of supplemental coverage becomes more difficult.
The 12-Month Medicare Advantage Trial Right Is Real but Narrower Than It Sounds
Federal law does provide valuable trial rights for certain beneficiaries who try Medicare Advantage and change their minds during the first year. Someone who joins Medicare Advantage when first eligible for Medicare at 65 and returns to Original Medicare within the first 12 months has guaranteed rights to purchase certain Medigap coverage. A person who already had Medigap, drops it to join Medicare Advantage for the first time and returns within the first year also has special rights to regain Medigap coverage, subject to the detailed rules.
The protection is broader than the outline’s suggestion that Parts A and B must necessarily have been started on precisely the same day. What matters is whether the beneficiary fits one of Medicare’s defined trial-right situations. Because the details differ depending on whether someone was new to Medicare or previously owned Medigap, beneficiaries should verify the right before canceling existing coverage.
The trial right is also not a permanent escape hatch. Someone who has spent several years in Medicare Advantage generally cannot invoke the initial 12-month protection after developing a serious health condition. State rules can provide additional Medigap enrollment opportunities, so the outcome depends partly on where the beneficiary lives, but federal protection should not be assumed beyond the specified circumstances.
Travel Can Make Provider Flexibility Much More Valuable
Retirees who spend most of the year close to home may be perfectly comfortable using a local Medicare Advantage network. Someone who spends winters in Florida, summers near grandchildren in another state and several months traveling around the country may place much greater value on Original Medicare’s nationwide provider structure.
Medicare Advantage plans must cover emergency and urgently needed care under Medicare rules, including when beneficiaries are temporarily outside the plan’s service area. Routine and ongoing nonemergency care can be much more complicated, particularly in an HMO. PPOs provide more flexibility but can charge substantially more for out-of-network services, and the combined in- and out-of-network out-of-pocket limits can be much higher than the in-network limit.
Medigap does not make Original Medicare universally worldwide coverage. Original Medicare generally provides limited coverage outside the United States, although certain Medigap plans include benefits for qualifying foreign travel emergencies. The key domestic advantage is that a beneficiary can generally use Medicare-participating doctors and hospitals throughout the country without first checking whether they belong to a private plan’s local network.
For frequent travelers, that convenience can justify a meaningful monthly premium even if annual medical spending remains low.
A Bad Health Year Changes the Arithmetic
Consider two healthy 65-year-olds evaluating coverage. One chooses a Medicare Advantage plan with a $0 additional premium while the other buys a Medigap plan costing $200 monthly and also maintains separate prescription coverage. Ignoring other differences, the Medigap enrollee starts each year roughly $2,400 behind because of the supplement premium.
During several healthy years, the Advantage enrollee may clearly spend less. If health deteriorates, however, hospital copayments, outpatient coinsurance, rehabilitation expenses and other Part A and B cost sharing can accumulate toward the plan’s out-of-pocket maximum. The average 2026 in-network Medicare Advantage limit of $5,421 demonstrates why a $0-premium plan should never be modeled as though annual medical costs are necessarily zero.
It would also be misleading to claim that a Medicare Advantage beneficiary will definitely spend $9,000 or that a Medigap beneficiary’s total annual expense will always be around $5,000. Actual costs depend on the individual plan, supplement premium, Part D coverage, healthcare utilization and which services count toward each limit. A better comparison models a healthy year, a moderate-use year and a serious-illness year using the exact plans available in the retiree’s ZIP code.
That exercise reveals what the premium is purchasing. Medigap may cost more when very little happens but can substantially reduce variability when a great deal happens. Medicare Advantage may save meaningful money when healthcare use remains low while requiring the beneficiary to retain more financial exposure when it does not.
The Perks Should Be the Last Part of the Decision
Dental coverage, gym memberships, hearing benefits and over-the-counter allowances are easy to compare because they provide immediate value. Provider access, future underwriting risk and prior authorization are harder to appreciate because their importance may remain invisible until someone develops a serious illness.
That can lead consumers to overvalue benefits worth hundreds of dollars while underexamining healthcare risks worth thousands. A dental allowance may be valuable, but it should not outweigh whether an important hospital is outside the network or whether a retiree is comfortable with the plan’s authorization procedures. Conversely, someone should not pay thousands of dollars annually for Medigap merely because broader access sounds reassuring if the premium creates meaningful strain on the household budget.
Supplemental benefits should therefore break a close tie rather than determine the entire Medicare strategy. The first questions should involve healthcare access, maximum financial exposure, prescriptions, travel habits and the ability to afford premiums over many years.
There Is No Universal Winner
Medicare Advantage is not simply the cheap option and Medigap is not automatically the superior option. The two approaches distribute cost, administration and risk differently.
Someone with limited retirement income may reasonably prioritize low fixed premiums and find an Advantage plan with an excellent local network. Another retiree may be willing to pay substantially more every month because the ability to see Medicare-participating specialists around the country is more important than dental benefits or a gym membership. A third may have employer or retiree coverage that changes the comparison completely.
The mistake is evaluating the decision solely according to what healthcare costs today. Insurance decisions should consider the possibility that tomorrow’s medical needs will be very different, particularly because switching from Medicare Advantage to Medigap later is not always as simple as changing plans during the annual enrollment period.
Paying $150 or $200 a month for a Medicare supplement can look expensive when someone is healthy. Paying that premium for 20 years can certainly add up to a substantial amount of money. But the person buying Medigap is not merely purchasing reimbursement for this year’s doctor visits; the premium is buying greater predictability, broader access and protection against having to reconsider those issues after health has already changed.
A $0 Medicare Advantage premium can be an excellent value. It simply is not free healthcare. Once that distinction is understood, the choice becomes much clearer: Decide which risks you are comfortable keeping, which ones you would rather transfer to an insurer and how much you are willing to pay for the freedom to receive care on your own terms.
