The Medicare Plan People Rarely Give Up and Why

Medicare beneficiaries have several ways to structure coverage, but one option tends to inspire unusually strong loyalty: Original Medicare paired with a Medigap policy. People who choose that route often stay with it for years because the appeal is not primarily a gym membership, dental allowance or low introductory premium. It is the ability to use Original Medicare’s broad provider access while shifting much of the unpredictable cost sharing to a supplemental insurer.

That does not mean Medigap is automatically the best choice for everyone. Medicare Advantage can provide lower upfront premiums, annual out-of-pocket limits and additional benefits that Original Medicare does not ordinarily include, while some beneficiaries simply cannot justify paying a separate Medigap premium every month. The real distinction is between paying more for predictability and provider flexibility versus accepting more plan-specific rules in exchange for potentially lower monthly costs and bundled extras.

The strongest case for Medigap is therefore not that the policy is permanently cheap or that Medicare Advantage is inherently inferior. Medigap premiums can increase, Medicare Advantage works well for millions of beneficiaries and both systems have tradeoffs. The important difference is that standardized Medigap coverage is guaranteed renewable as long as premiums are paid, while Medicare Advantage contracts, networks, service areas and benefits can change from one year to the next.

The Three Basic Ways to Receive Medicare Coverage

The first option is Original Medicare Parts A and B by themselves. This provides broad access to doctors and hospitals participating in Medicare, but it leaves beneficiaries responsible for deductibles and coinsurance and does not impose a general annual out-of-pocket maximum on Part A and Part B expenses. For someone with significant medical needs, that exposure is one reason many beneficiaries add supplemental coverage rather than relying on Original Medicare alone.

The second approach is Original Medicare plus a standardized Medigap policy, usually combined with a separate Part D prescription drug plan. Medigap plans such as Plan G or Plan N help pay some of the deductibles, coinsurance and other cost sharing that remain after Medicare processes a covered claim. Because the supplement works behind Original Medicare rather than replacing it, the beneficiary generally keeps the provider-access rules of Original Medicare rather than entering a private plan network.

The third approach is Medicare Advantage, in which a private insurer receives Medicare payments and provides the beneficiary’s Medicare-covered services through a Part C plan. These plans often include Part D coverage and may add dental, vision, hearing, transportation, fitness or other benefits not ordinarily included in Original Medicare. They also generally use provider networks, utilization management and annual benefit designs that can change over time, which creates a fundamentally different experience from Original Medicare plus Medigap.

None of those choices is universally superior. A healthy retiree who values low monthly premiums and has excellent local network options can reasonably prefer Medicare Advantage, while someone who travels frequently, sees multiple specialists or wants greater certainty about provider access may place much more value on Medigap.

The Real Appeal of Medigap Is Stability

Standardized Medigap policies are generally guaranteed renewable. Medicare says that once a beneficiary buys a policy, it renews each year as long as the premiums are paid, with only limited circumstances in which the insurer can terminate coverage. Health deterioration by itself is not a reason for the insurer to cancel a standardized Medigap policy.

That protection is extremely valuable in retirement because the years when a person most needs extensive medical care may arrive long after the original insurance decision. Someone who develops cancer, heart disease or another serious condition does not have to requalify medically every year simply to keep the existing Medigap policy. The coverage can remain in force while the person’s healthcare needs become more complicated.

“Guaranteed renewable,” however, should not be confused with “premium locked for life.” Medicare explicitly notes that Medigap premiums vary based on the policy, location and other factors and that the amount can change each year; Medicare also says premiums typically increase over time. A beneficiary can therefore keep the policy but still experience substantial premium increases as years pass.

That distinction matters because some sales pitches oversell Medigap stability. The benefit structure and ability to keep coverage can be highly stable, but the price is not guaranteed to remain stable. People comparing Plan G and Plan N should evaluate the insurer’s pricing history and rating method rather than assuming today’s attractive quote represents what the policy will cost at age 80.

Medigap’s Provider Access Is Its Strongest Competitive Advantage

For many beneficiaries, the most important Medigap feature is not what happens to a $20 copayment. It is what happens when a serious diagnosis sends someone searching for a nationally recognized specialist or hospital.

A standard Medigap policy works with Original Medicare, so the key provider question is generally whether the physician or hospital participates in Medicare rather than whether the provider contracted with a particular Medicare Advantage network. This can be especially valuable for beneficiaries who travel, divide time between states or want access to specialty centers outside their immediate community.

Medicare Advantage works differently because most plans rely on provider networks. KFF’s 2025 analysis found that Medicare Advantage enrollees had access, on average, to just under 48% of the physicians in their area who were available to beneficiaries in traditional Medicare. That is an important restriction, but it should not be misreported as saying only half of America’s doctors “accept Medicare Advantage.” The finding measures the share of local physicians available inside a typical plan’s network, not whether physicians accept any Medicare Advantage plan at all.

The distinction matters because Medicare Advantage networks vary widely. One plan can have strong contracts with a local hospital system while another excludes it, and a physician who is out of network for one insurer may be in network for another. Anyone choosing Medicare Advantage should therefore check the actual doctors, hospitals and specialists they are likely to need rather than relying on a national average.

Medicare Advantage Changes Every Year Because It Is an Annual Contract

Medicare Advantage plans are not permanent in the same sense as an existing guaranteed-renewable Medigap policy. Benefits, premiums, drug formularies, networks and service areas can change from one calendar year to the next, and insurers can decide to discontinue a plan or leave particular counties.

That became especially visible in the 2026 market. KFF found that about 2.6 million people, representing roughly 13% of beneficiaries enrolled in individual Medicare Advantage prescription drug plans included in its analysis, were in plans terminated for 2026. UnitedHealthcare exited 225 counties, Humana 198, Elevance 181 and CVS 160, although insurers continued to offer plans in many other markets.

Those figures should not be interpreted as evidence that Medicare Advantage is disappearing. KFF subsequently found that 98.9% of beneficiaries affected by those terminations still had at least one Medicare Advantage prescription-drug option available for 2026, with an average of roughly 25 alternatives in their areas. The disruption was real, but the overwhelming majority of affected beneficiaries were not left without another Advantage option.

The larger lesson is that Medicare Advantage requires annual attention. A plan that works exceptionally well today can still alter its network, cost sharing or benefits next year, and a beneficiary should not assume that successful enrollment once eliminates the need to review coverage later.

The Annual Notice of Change Is One of the Most Important Medicare Documents

Medicare health and drug plans send an Annual Notice of Change each fall describing changes that will take effect in January. Medicare says beneficiaries should receive the notice in September and review modifications to costs, coverage and other plan features before deciding whether the plan still meets their needs.

This notice deserves more attention than most Medicare marketing material. A plan may keep the same name while changing a hospital network, increasing a drug copayment or modifying an out-of-pocket maximum. Someone who automatically renews without reading the notice can discover the change only after trying to use the benefit the following year.

The Annual Notice of Change is particularly important for Medicare Advantage because medical benefits and drug coverage can be integrated into one plan. Changes can therefore affect both access to healthcare and prescription costs at the same time. For someone with Original Medicare plus Medigap, the separate Part D policy still deserves the same annual scrutiny even if the Medigap policy itself remains satisfactory.

This is why “renewal rate” by itself is an imperfect measure of quality. People may remain with a plan because it works well, because switching is inconvenient or because moving to another type of coverage could require underwriting. Persistence tells us something about satisfaction and switching friction, but it should not substitute for evaluating the benefits.

Getting Into Medigap Is Easier Than Getting Back Into It

One of the biggest strategic differences between Medigap and Medicare Advantage involves future insurability. Federal law provides a six-month Medigap Open Enrollment Period beginning when a person is at least 65 and enrolled in Part B, during which insurers generally cannot use medical underwriting to deny standardized coverage based on health.

After that window closes, the rules can become much more restrictive. Medicare says that in most cases there is no federal guarantee that an insurer will sell someone a new Medigap policy outside the open-enrollment period unless the beneficiary qualifies for a specific guaranteed-issue right, though some states provide stronger protections.

That asymmetry makes the initial decision important. Someone can generally move from Medigap to Medicare Advantage during an applicable enrollment period relatively easily, but returning later to Medigap may involve medical underwriting unless a federal or state protection applies.

People sometimes interpret that as an argument that everyone should choose Medigap at 65. It is not. It means people should understand that the choice has future option value, particularly if health declines later.

Medigap Is Portable, but the Premium Can Change

Another reason beneficiaries favor Medigap is mobility. Medicare’s current guidance says beneficiaries can generally keep an existing Medigap policy when moving to another state as long as they continue to have Original Medicare. That can be attractive to retirees who expect to relocate or divide time among different parts of the country.

The policy may remain, but the economics can still change. Premiums can depend on geography, insurer rating practices and other permitted factors, and a move does not automatically create a right to switch to any cheaper Medigap policy without underwriting.

Medicare Advantage is more geographically constrained because plans operate within service areas. Moving permanently outside a plan’s service area can trigger a Special Enrollment Period and require the beneficiary to select new coverage.

Again, neither structure is inherently wrong. Someone who expects to live permanently in one city and receives all care through a strong integrated local network may not care about national portability, while a retiree who spends winters in one state and summers in another may consider it essential.

Premium Predictability Should Not Be Oversold

Medigap is often described as predictable because covered Part A and B medical costs can become easier to anticipate, especially with a comprehensive standardized plan such as Plan G. The premium itself, however, is another matter.

Insurers can increase Medigap premiums, sometimes meaningfully, and age-related pricing can make the trajectory different depending on whether the policy is community-rated, issue-age-rated or attained-age-rated. Medicare also notes that premiums can vary significantly among insurers even when they sell the same standardized letter plan.

A very cheap Plan G at age 65 is therefore not automatically the best long-term value. Beneficiaries should understand how the insurer sets premiums, whether discounts disappear over time and how competitive the rate remains compared with other carriers.

That still differs from Medicare Advantage cost uncertainty. An Advantage beneficiary can experience changes in premium, deductible, copayments, network and out-of-pocket maximum simultaneously, whereas a Medigap policy can provide greater consistency in the underlying standardized benefits even while the monthly premium rises.

Medicare Advantage’s Out-of-Pocket Maximum Is a Real Advantage

One area where Medicare Advantage provides an important protection is the annual medical out-of-pocket maximum. Original Medicare Parts A and B do not contain a comparable broad annual cap on beneficiary cost sharing, which is one reason relying on Original Medicare alone can expose someone to significant expenses.

Medicare Advantage plans are required to establish an annual limit for covered Part A and B services, though the amount varies by plan and can be substantial. After the beneficiary reaches the plan’s applicable limit, the plan generally pays 100% of covered Part A and Part B services for the rest of the year under the plan’s rules.

That feature deserves to be weighed against network and authorization restrictions. A beneficiary can reasonably prefer a defined maximum financial exposure even if the plan offers fewer provider choices.

Medigap solves the Original Medicare cost-sharing problem differently. Instead of imposing one Advantage-style annual maximum, the supplemental insurer pays specified portions of Medicare-approved cost sharing according to the standardized Medigap plan selected.

Part D Is Separate From Medigap and Should Be Reviewed Every Year

A Medigap policy generally does not include modern Part D prescription drug coverage. Someone choosing Original Medicare plus Medigap typically selects a separate Part D plan, and that drug plan can change annually even when the Medigap policy remains the same.

Medicare’s annual Open Enrollment Period runs from October 15 through December 7, not from August 1 through October 15. During that period, beneficiaries can join, drop or switch Medicare drug plans, with changes generally taking effect January 1.

That annual review matters because formularies, pharmacy networks and cost sharing can change. The cheapest plan for someone taking no medications may be a poor choice after a new diagnosis introduces several expensive prescriptions, while last year’s excellent plan may move an important drug to a different tier.

The correct assumption is therefore not that the current Part D plan will probably remain best. Beneficiaries should rerun their actual medication list and preferred pharmacies every fall and let the total projected cost determine whether keeping the plan still makes sense.

Drug Coverage Can Depend on How the Medicine Is Administered

Some medications create confusion because similar treatments can fall under different parts of Medicare. Certain physician-administered drugs can be covered under Part B when Medicare’s coverage requirements are met, while self-administered prescription drugs are more commonly covered through Part D.

Osteoporosis treatment is one example where the details matter. Medicare confirms that Parts A and B cover certain injectable osteoporosis drugs for beneficiaries who satisfy specific eligibility requirements, but it would be too broad to say that every drug such as Prolia is automatically covered by Part B simply because it is injected.

The site of service, diagnosis, drug and Medicare coverage criteria can determine how a claim is processed. Oral osteoporosis medications obtained at a pharmacy are generally analyzed under the beneficiary’s Part D plan instead, which means formulary placement and drug-plan rules become important.

Patients comparing oral and injected therapies should begin with the medical question of which treatment is clinically appropriate. Coverage and cost matter, but insurance design should not determine treatment without the prescribing clinician’s input.

Extras Should Come After the Medical Network

Medicare Advantage marketing frequently emphasizes dental benefits, grocery cards, fitness memberships, hearing allowances and other supplemental benefits because those features are easy to understand. They can also provide legitimate value.

The mistake is allowing a relatively small extra benefit to overshadow medical access. A $1,000 dental allowance can become irrelevant if the cardiologist, cancer center or hospital a beneficiary wants is not in the plan’s network during a serious illness.

For that reason, provider access should be among the first questions asked when evaluating Medicare Advantage. Beneficiaries should check primary-care doctors, specialists, hospitals, pharmacies and any nationally recognized center they would realistically want to use for complex care.

After those fundamentals are satisfied, supplemental benefits can help distinguish otherwise comparable plans. Insurance should be selected first for the financially catastrophic or medically serious events it needs to handle, not solely for the smaller perks that are easiest to advertise.

Plan G and Plan N Solve Slightly Different Problems

Among people choosing Medigap, Plan G and Plan N frequently emerge as leading options because both can provide substantial protection from Original Medicare cost sharing. Plan G is typically more comprehensive, while Plan N requires the beneficiary to accept certain additional out-of-pocket expenses in exchange for a potentially lower premium.

The best choice depends partly on the premium difference. If Plan G costs only modestly more than Plan N, some beneficiaries may prefer the additional predictability; if the premium gap is large, a healthy beneficiary who rarely visits doctors may consider Plan N more attractive.

Premium quotes cannot responsibly be generalized nationally. A plan that costs very little in one ZIP code can be considerably more expensive in another because Medigap pricing varies by insurer, state, age, rating structure and applicable discounts.

That is another reason Medicare shopping should be local and individualized. The standardized benefits make it easy to compare what Plan G covers, but they do not standardize the price charged by competing insurers.

The Best Medicare Plan Depends on Which Risk You Want to Carry

Medigap and Medicare Advantage shift different risks between the beneficiary and insurer. Medigap usually requires accepting a higher monthly premium in exchange for broader Original Medicare provider access and relatively predictable cost sharing. Medicare Advantage can reduce or eliminate the supplemental premium but makes the beneficiary more dependent on a private plan’s annual network, benefit design and utilization rules.

A healthy 65-year-old may reasonably look at a Medigap premium and wonder why so much money should be paid every month for healthcare that is barely being used. The same person at 78 may care far more about seeing a particular specialist without first determining which Medicare Advantage network currently includes that physician.

That does not mean people should purchase the most expensive coverage out of fear. It means Medicare is fundamentally an exercise in risk allocation, and the cheapest option during healthy years may or may not be the best fit for the risk someone wants insured later.

Long-term stability has economic value even when it is difficult to price. So do lower current premiums, an annual out-of-pocket cap and supplemental benefits, which is why Medicare Advantage remains attractive to many beneficiaries.

The Most Popular Plan Is Not Automatically the Best Plan

Medigap’s high retention among satisfied policyholders is understandable. Guaranteed renewability, Original Medicare’s provider access and standardized benefits can make the coverage relatively easy to live with after the initial decision is made. Someone who values those characteristics may have little reason to abandon a policy that continues to meet medical and financial needs.

Still, describing one Medicare structure as universally superior would ignore both cost and personal circumstances. Medigap premiums can rise significantly, drug coverage must usually be purchased separately and someone leaving Medigap may later face difficulty returning. Medicare Advantage can provide excellent coverage for beneficiaries whose doctors and hospitals participate in the network and who value lower monthly premiums and additional benefits.

The right comparison therefore begins with medical access, not marketing. Identify the doctors and hospitals that matter, calculate realistic annual costs under healthy and high-use scenarios, evaluate prescription coverage and then consider how much uncertainty the household is willing to accept from one year to the next.

Medicare decisions become much easier when beneficiaries stop asking which plan has the most perks and start asking which structure they would want during the most serious medical year of their retirement. The plan that looks best when almost nothing goes wrong is not always the one people are most grateful to have when everything does.