Medigap vs Medicare Advantage forces millions of Americans to pick a path before the December 7 deadline. Open Enrollment is underway, and decisions made now take effect on January 1. More than half of people eligible for Medicare currently sit in Advantage plans. Many of them will discover that reversing the choice later is far harder than it first appears. Standard Part B premiums run $202.90 a month, and the Part B deductible stands at $283.
The Window That Closes Soon
Beneficiaries can switch from one Medicare Advantage plan to another or move back to Original Medicare through early December. Coverage changes do not start until the new year. Some people will lose their current Advantage plan entirely because insurers are shrinking networks or exiting markets for 2027. Those individuals must find new coverage. The same period lets people already on Original Medicare add or drop a Medigap policy, but the rules that govern Medigap are stricter than the rules that govern Advantage.
Two Different Ways to Handle the Same Gaps
Original Medicare covers hospital and medical care but leaves substantial cost-sharing. The hospital deductible is $1,736 per benefit period. After that, coinsurance applies on longer stays. Most outpatient services carry 20 percent coinsurance once the Part B deductible is met. Medigap policies, sold by private companies, step in to cover those leftover amounts. Advantage plans do something else: they replace Original Medicare altogether. A private insurer delivers the Part A and Part B benefits, usually folds in drug coverage, and sets its own rules on what members pay when they use care.
You cannot keep both. Federal law prevents anyone enrolled in an Advantage plan from buying a Medigap policy. The two products solve the same underlying problem in opposite ways.
What People Actually Pay in 2026
Advantage plans often charge no extra premium beyond the Part B amount. Many also include prescription drugs. Members still face copays and coinsurance until they reach the plan’s annual out-of-pocket limit. Federal rules cap that limit at $9,250 for in-network care this year. The combined in-network and out-of-network ceiling is $13,900. Average limits across plans sit lower, near $5,400 for in-network services, but individual plans vary.
Medigap works the other way. Premiums are higher, yet cost-sharing for covered Medicare services drops sharply. Plan G, the most popular choice for people newly eligible, pays nearly everything after the Part B deductible. High-deductible versions of Plan G exist and require members to meet a $2,950 threshold before full coverage begins. Plans K and L charge lower premiums but leave members sharing costs until they hit fixed annual ceilings of $8,000 and $4,000 respectively.
A person who rarely sees doctors may spend less under an Advantage plan in a quiet year. Someone who faces hospital stays, specialist visits, or ongoing treatment often ends the year with lower total costs under Medigap once premiums are compared with copays.
Where You Can Get Care
Medigap travels with Original Medicare. Any doctor or hospital in the country that accepts Medicare is available. No referral is needed. Advantage plans restrict care to contracted networks in most cases. HMO versions generally cover only in-network providers except for true emergencies. PPO versions allow out-of-network treatment but charge more. Networks change. Doctors leave. Prior authorization is routine for many tests and procedures.
People who winter in one state and summer in another, or who simply want the right to see specialists without checking a list, tend to favor the broader access that comes with Medigap. Those who stay close to home and whose preferred physicians remain in network may see little practical difference.
The Difficulty of Changing Course
Medigap comes with a one-time open enrollment period that lasts six months after a person turns 65 and first enrolls in Part B. During those months insurers must accept the applicant and cannot raise rates because of health. After that window closes, most states let companies use medical underwriting. They can refuse coverage or charge more if the applicant has certain conditions.
Roughly three-quarters of people currently enrolled in Advantage plans have at least one condition that could trigger such a denial if they later try to buy Medigap outside a protected period. A short trial right exists for people who join Advantage for the first time and then decide to return to Original Medicare within 12 months. Outside that narrow protection and a few other guaranteed-issue situations, the path back to Medigap is often blocked.
What Comes With the Package
Advantage plans frequently advertise dental cleanings, vision exams, hearing aids, and allowances for over-the-counter items. These extras are not required and can be reduced or removed in future years. Medigap covers only the cost-sharing that Original Medicare leaves behind. It does not pay for routine dental, vision, or hearing services. People who choose Medigap must also enroll in a separate Part D plan if they want drug coverage.
Advantage offers the convenience of one card and one premium. Medigap requires coordination among Original Medicare, the supplemental policy, and a drug plan. Both cover the same core hospital and medical services that Original Medicare covers. The differences lie in predictability, provider choice, and the presence or absence of those additional benefits.
Fitting the Choice to Real Life
Someone who travels often or who values the ability to see any Medicare doctor without prior approval generally finds Medigap more reliable. Someone who wants lower monthly premiums, prefers bundled drug coverage, and is comfortable staying inside a network often prefers Advantage. Health status matters. People with ongoing conditions or a history of high medical use frequently see more stable annual costs under Medigap Plan G. Healthy people who use little care may come out ahead under a low-premium Advantage plan, provided their doctors stay in network.
About 46 percent of people who remain in traditional Medicare carry a Medigap policy. Advantage enrollment continues to grow, though the pace has slowed. Special Needs Plans account for much of the recent increase. Whatever path a beneficiary chooses this fall will shape both access and spending for the coming year and beyond.