Medicare Advantage vs Medigap 2026: Real Cost Comparison

The Medicare Advantage vs Medigap decision is the single biggest coverage choice you make when you sign up for Medicare, and the one people regret most often when they get it wrong. Both start with the same Original Medicare foundation, both are sold by private insurers, and both promise to fill the gaps. That is where the similarity ends.

In 2026, Medicare Advantage covers 54% of the 62.8 million people with Medicare, while roughly 20% of all beneficiaries carry a Medigap policy alongside Original Medicare, according to KFF’s December 2025 analysis.

This guide walks through the real cost math for 2026, the doctor-network trade-off, the 6-month switch window most people miss, and which option actually wins for cancer patients, frequent travelers, healthy 65-year-olds, and everyone in between.

Key Takeaways

• Medicare Advantage caps 2026 in-network out-of-pocket at $9,250 per CMS but restricts you to a plan network and often requires prior authorization.
• Medigap Plan G runs about $150 to $200 per month for a healthy 65-year-old, covers nearly all Original Medicare cost-sharing, and lets you see any provider who accepts Medicare.
• You get one clean 6-month guaranteed-issue Medigap window when you first enroll in Part B at 65. After that, most states let insurers use medical underwriting.
• Heavy users of care and cancer patients typically pay less overall with Medigap. Healthy retirees comfortable with a network often save with Medicare Advantage.
• The 2026 Open Enrollment window is October 15 to December 7, with changes taking effect January 1.

What is the real difference between Medicare Advantage and Medigap in 2026?

Medicare Advantage (Part C) replaces Original Medicare with a private plan that bundles Part A, Part B, and usually Part D into one policy. You still pay the standard Part B premium of $202.90 per month in 2026, and many MA plans add a $0 or low extra premium on top. In exchange, the plan takes over what Medicare pays, sets its own copays and network, and adds extras like dental, vision, hearing, and a small OTC allowance.

Medigap works the opposite way. You keep Original Medicare as your primary coverage, and Medigap steps in to pay the 20% coinsurance, the hospital deductible, and other cost-shares that Original Medicare leaves you responsible for. There is no network. There is no prior authorization. Any doctor or hospital in the United States that accepts Medicare accepts your Medigap policy.

As of 2023, 12.2 million people carried a Medigap policy, which is 43% of everyone in Original Medicare, per KFF’s coverage snapshot. Average Medigap premiums run about $2,604 per year in KFF’s most recent enrollment brief.

Feature	Medicare Advantage	Medigap + Original Medicare
Who pays your claims	Private insurer replaces Medicare	Medicare pays first, Medigap pays the gap
Network	HMO, PPO, or PFFS in a set service area	Any provider who accepts Medicare, anywhere in the US
Prior authorization	Often required	Rarely required
Prescription drugs	Usually built in (MA-PD)	Separate Part D plan required
Extra benefits	Dental, vision, hearing, OTC allowance	Not included
2026 out-of-pocket ceiling	$9,250 in-network (CMS cap)	Effectively zero after Plan G premium plus $283 Part B deductible
Monthly premium range	$0 to $80 on top of Part B	$150 to $300+ depending on plan, state, and age

The trade-off is direct. MA usually costs less month to month and adds extras, but limits where you go and requires plan permission for many services. Medigap costs more each month but removes the network wall and the prior-auth gate.

How do 2026 monthly costs actually compare?

Every honest comparison starts with the same base: everyone with Medicare Part B pays the $202.90 monthly premium in 2026, per CMS’s November 2025 rate announcement. Higher earners pay more under IRMAA, the Income-Related Monthly Adjustment Amount, which adds $81.20 to $487.00 to the standard premium depending on modified adjusted gross income.

What you add on top depends on which path you pick. Medicare Advantage plans in 2026 range from $0 extra premium (about 60% of individual MA plans) up to $80 for premium HMO or PPO plans with richer benefits. For a deeper look at how Part B pricing works, including full IRMAA brackets, see our Medicare Part B premium 2026 guide.

Medigap Plan G, the most popular Medigap option for people who first enrolled after 2020, typically runs $165 to $250 per month for a healthy 65-year-old, with wide state variation. Recent 2026 rate filings from major carriers show 12% to 26% increases in states like NY, NJ, FL, and CA, so expect the upper end in high-cost markets.

On the surface, Medicare Advantage is $150+ cheaper per month for most people. But monthly premium is only half the equation. When you actually use care, Medigap Plan G leaves you owing only the Part B deductible of $283 for the year, per Medicare.gov. A Medicare Advantage plan can charge you copays for every specialist visit, imaging test, and inpatient day up to the CMS-set $9,250 in-network out-of-pocket maximum for 2026.

Do the annual math on a heavy-utilization year. Plan G at $175 per month plus Part D at $37 plus the $283 Part B deductible works out to $2,827 all-in for the year, and you can see any doctor. A Medicare Advantage member who hits the in-network cap pays about $9,250 plus premiums plus the $202.90 Part B, so roughly $12,000 that year, and only for in-network care. That is the gap Medigap buyers are paying up-front to close.

Can you keep your doctors with either plan?

Original Medicare with a Medigap policy accepts every provider in the country who takes Medicare, which is the overwhelming majority of practicing physicians and virtually every hospital. There is no network. There is no service area. If your daughter moves to Arizona and you visit her cardiologist there, Medicare pays as if you were home. If you spend winters in Florida, the same rule applies.

Medicare Advantage works within a defined network and service area. HMO plans usually require you to use in-network providers except for emergencies. PPO plans allow out-of-network care at higher cost-share. And plans can and do change their provider lists every January.

Hospital drops accelerated in 2026. Mayo Clinic, Mass General Brigham, Providence, NewYork-Presbyterian, OSU Wexner Medical Center + James Cancer Center, and Moffitt Cancer Center have all dropped specific MA carrier contracts, citing prior-authorization burden and low reimbursement. That forces enrollees to switch doctors or switch plans, sometimes mid-treatment. Medicare.gov puts it plainly: with MA “you may need to use doctors and other providers who are in the plan’s network and service area.”

Prior authorization is the other doctor-choice wrinkle. MA plans routinely require plan approval before covered services like MRI scans, physical therapy, home health, skilled nursing stays, and many outpatient procedures. Original Medicare requires prior authorization for a much smaller list. If you have a doctor you trust and a treatment plan already in motion, the MA prior-auth step can slow or block care.

How do prescription drugs fit into each option?

Most Medicare Advantage plans include Part D prescription coverage built in, which is called an MA-PD plan. You get one card, one deductible, and one out-of-pocket maximum for medical and drug costs combined. That simplicity is one of MA’s biggest selling points for people who take multiple daily medications.

Medigap does not include drug coverage. You must buy a stand-alone Part D plan alongside your Medigap policy, which runs about $37 per month on average in 2026. That is an extra card, an extra deductible, and an extra out-of-pocket track. On the plus side, you can shop Part D separately every year during Open Enrollment to find the cheapest plan for your specific drug list, without being forced to keep the drug plan bundled with a medical plan you like.

Under the Inflation Reduction Act, Part D added an annual out-of-pocket cap on covered drugs starting January 1, 2025. The cap was $2,000 in 2025 and rises to $2,100 in 2026 under the required annual inflation adjustment. Whether you get Part D through MA or through a stand-alone plan with Medigap, your total spending on covered brand and generic medications will not exceed $2,100 in the 2026 calendar year, per CMS’s 2026 Part D redesign guidance.

What if you have cancer, dialysis, or another chronic condition?

This is the scenario where the choice matters most, and where the standard “MA is cheaper” narrative breaks down hard. Cancer, end-stage renal disease, and severe chronic conditions typically require frequent specialist visits, imaging, infusion therapy, hospital stays, and access to top-tier centers. Every one of those touches a Medicare Advantage plan’s network wall and prior-authorization desk.

An NCI-designated cancer center like MD Anderson, Memorial Sloan Kettering, or Dana-Farber accepts Original Medicare and Medigap without question. Many of the same centers accept only a handful of Medicare Advantage plans, and some accept none in your state. If you are diagnosed after enrolling in an MA plan and the center you want is out of network, you either pay huge out-of-network costs or switch plans, and switching from MA to Medigap after age 65 usually means passing medical underwriting.

Prior authorization is the second concern. A KFF review of MA data found that MA plans processed roughly 50 million prior-authorization requests in 2023, with a 6.4% first-pass denial rate that rose to 7.7% in the 2024 update. During active cancer treatment, that friction becomes clinically dangerous. Chemotherapy delays, imaging denials, and step-therapy requirements can all slow treatment. Original Medicare with Medigap has neither the network wall nor the prior-auth desk for most oncology services.

The cost math also flips. A cancer patient in active treatment often hits the $9,250 in-network MA maximum by mid-year, and any out-of-network care sits above that cap entirely. A Medigap Plan G enrollee in the same situation pays their premium plus the $283 Part B deductible for the whole year, no matter how many rounds of chemo or hospital days.

Can you switch from Medicare Advantage to Medigap later?

Technically, yes. Practically, it depends on your state and your health. During the Medicare Open Enrollment Period from October 15 to December 7, you can drop your MA plan and return to Original Medicare, with the change taking effect January 1. During the Medicare Advantage Open Enrollment Period from January 1 to March 31, you can also leave MA and go back to Original Medicare, effective the first of the following month.

The catch is Medigap. Once you leave your one-time 6-month guaranteed-issue window at age 65, Medigap insurers in most states can use medical underwriting to price you or reject you. A pre-existing heart condition, diabetes with complications, or a cancer history can push you into a much higher premium tier or block you from a policy entirely. That is why the “try MA first, switch to Medigap if I need it” plan often does not work as people expect.

Switch situation	Guaranteed-issue right in most states?	Time window
First 6 months of Part B at age 65	Yes	6 months, one-time
MA “trial right” (first time in MA at 65, want out)	Yes	First 12 months in MA
MA plan leaves your service area or you move out	Yes	63 days from notice
You lose employer/union retiree coverage	Yes	63 days from loss
You switch during Oct 15 to Dec 7 with no qualifying event	No (underwriting applies in most states)	Any time
You live in NY, CT, MA, or ME	Yes (state-specific protections)	Year-round or annual open window

Four states carry stronger consumer protection than federal law. New York and Connecticut require Medigap issue year-round with no medical underwriting. Massachusetts and Maine use community rating and annual open enrollment windows that make later switching much easier. Everywhere else, the safest path is to enroll in Medigap during your 6-month guaranteed-issue window at 65 and stay in it. If income is tight and Medigap premiums feel out of reach, check whether you qualify for a Medicare Savings Program that can pay some or all of your Part B premium.

Which Medigap plan should you actually pick in 2026?

Ten standardized Medigap plans exist, labeled A, B, C, D, F, G, K, L, M, and N. For anyone new to Medicare after January 1, 2020, Plans C and F are off the table because Congress closed them to new enrollees. That leaves three practical choices for most 2026 buyers: Plan G, Plan N, and high-deductible Plan G.

2026 feature	Plan G	Plan N	High-Deductible Plan G
Typical monthly premium (65 y.o.)	$150-$200	$100-$140	$45-$65
Part A hospital deductible	Covered	Covered	You pay first $2,950, then covered
Part B deductible ($283)	You pay	You pay	Counts toward $2,950
Part B coinsurance (20%)	Covered 100%	Covered except copays	Covered after deductible
Office visit copay	None	Up to $20 per visit	Counts toward deductible
ER copay	None	Up to $50 per visit	Counts toward deductible
Part B excess charges	Covered	Not covered	Covered after deductible
Foreign travel emergency	80% up to plan limit	80% up to plan limit	80% up to plan limit

Plan G is the default recommendation for most 65-year-old buyers. It covers everything except the Part B deductible, so your annual out-of-pocket is capped at $283 for medical care plus the Part D drug plan cap of $2,100 in 2026. Predictable.

Plan N saves you roughly $50 per month in premium versus Plan G. In exchange you pay up to $20 per doctor visit, up to $50 per ER visit if not admitted, and Plan N does not cover Part B excess charges. If your doctors accept Medicare assignment (most do) and you visit them a few times a year, the Plan N math often works out cheaper overall.

One 2026 caveat: after an April 2026 CMS rule change, Plan N is no longer offered under most federal guaranteed-issue situations. CT, ME, MA, MN, NY, OR, and WI still make it available year-round under state rules.

High-Deductible Plan G is aggressive. You pay a low premium (about $55/month in 2026) but the first $2,950 of your Medicare cost-sharing before the plan pays anything. Best for people who rarely see a doctor and want catastrophic-only coverage with the freedom of any provider.

What changes can you make during Open Enrollment October 15 to December 7?

The Medicare Open Enrollment Period runs from October 15 to December 7 every year, with any changes taking effect January 1, 2027. During this window you can:

• Switch from Original Medicare to a Medicare Advantage plan
• Switch from a Medicare Advantage plan back to Original Medicare
• Switch from one Medicare Advantage plan to another
• Switch from one Part D drug plan to another
• Join Part D for the first time (late enrollment penalty may apply)
• Drop Part D coverage

What Open Enrollment does not give you is guaranteed-issue Medigap in most states. If you plan to drop your MA plan and buy Medigap in a state that allows medical underwriting, expect the Medigap insurer to review your health before issuing a policy or setting your premium. Do that Medigap application before you drop your MA plan, and confirm approval in writing before you sign the MA disenrollment paperwork.

The Medicare Advantage Open Enrollment Period is a separate window from January 1 to March 31, and only lets you switch from one MA plan to another or drop MA entirely to return to Original Medicare. You cannot join MA for the first time during that window.

Heads up if you are with Humana in 2026. On its July 29, 2026 earnings call, Humana confirmed it is exiting Medicare Advantage plans covering roughly 600,000 members for the 2027 plan year. Non-renewal letters mail this September 2026. If your mailbox has one, you have a guaranteed-issue right to buy Medigap under Medicare’s plan-termination rule (63-day window), which is one of the few times you can move to Medigap after age 65 without medical underwriting. Do not wait until December.

How to pick the right option for your situation

The right answer depends on three questions: How much care will you use? Do you travel or live in two states? And how much monthly premium can you carry comfortably?

Healthy 65-year-old, tight budget, stays local. Medicare Advantage with a $0 or low-premium HMO in your area usually wins. You keep monthly costs near the $202.90 Part B premium, get dental and vision extras, and if a serious illness hits, the $9,250 in-network cap (the annual out-of-pocket maximum, or MOOP) is real protection.

Snowbird or frequent traveler. Medigap Plan G wins clearly. The freedom to see any Medicare-accepting doctor in any state, without a network approval process, is worth the premium. This is the biggest reason retirees who move between two states pick Medigap over MA.

Chronic condition, cancer history, or family history of major illness. Medigap Plan G during your one-time 6-month guaranteed-issue window at 65 is the safest financial move you can make. Once you’re locked in with no underwriting, insurers cannot drop you or raise premiums because your health changes.

Middle-of-the-road retiree, moderate care use, comfortable with a network. Look at MA plans with a national PPO carrier that has broad hospital contracts, or consider Plan N Medigap for the premium savings versus Plan G. Both are reasonable middle paths.

The most common mistake we see is treating this as a permanent decision. It is not, but the switch back to Medigap gets harder every year you delay past your 65-year-old guaranteed-issue window. If in doubt, take Medigap at 65 and re-evaluate every fall during Open Enrollment. It is much easier to leave Medigap for MA later than to leave MA for Medigap.

Bottom line for 2026 Open Enrollment

Medicare Advantage vs Medigap is not a debate about which product is “better.” It is a match between how you use care, where you live, and how much financial certainty you want.

Medigap Plan G costs more each month but hands you predictable spending, doctor-of-your-choice freedom, and no prior-authorization gatekeeping. Medicare Advantage costs less each month, adds extras Original Medicare doesn’t cover, and caps in-network out-of-pocket at $9,250, but it locks you into a network and requires plan permission for many services.

If you can carry $165 to $250 in extra monthly premium, Medigap almost always wins on flexibility and worst-case protection. If not, a well-chosen MA plan with a strong hospital network in your area can serve you well, especially if your one-time 6-month Medigap window at 65 has already closed.

Ready to compare specific plans in your state? Start with the free Plan Finder at Medicare.gov/plan-compare, and cross-check any Medigap quote against at least three carriers before signing.

Related reading on GrantsHubUSA:

• Medicare Advantage vs Original Medicare pillar guide for the full three-way framework before you add Medigap on top.
• Medicare deductibles 2026 explainer covers every Part A, Part B, and MA cost-share for the year.