Medigap Plan G vs Medicare Advantage 2026 is a decision that shapes your healthcare spending for years to come. Medigap Plan G is supplemental insurance that covers costs Medicare Part A and B do not pay, including copays, coinsurance, and hospital deductibles — leaving you with only the Part B deductible as an out-of-pocket cost. Medicare Advantage (Part C) is an all-in-one alternative to Original Medicare that bundles hospital, medical, and often prescription drug coverage into a single plan with network restrictions and prior authorization requirements. The answer depends on your health, your budget, and how much risk you can absorb. This post runs three real cost scenarios — low, medium, and high medical use — so you can see exactly where the crossover point lands and which plan fits your retirement spending plan.
2026 Plan G Annual Cost Breakdown Beyond the Premium
Choosing between Medigap Plan G and Medicare Advantage for 2026 comes down to one question: how much will you actually spend on healthcare next year? The answer depends on your health, your budget, and how much risk you can absorb. This post runs three real cost scenarios — low, medium, and high medical use — so you can see exactly where the crossover point lands and which plan fits your retirement spending plan. Medigap Plan G vs Medicare Advantage 2026 cost analysis varies significantly based on individual health circumstances and financial tolerance for risk.
The monthly premium is only the starting point. Medigap Plan G total annual cost for 2026 includes the Part B deductible of $283 plus the monthly premium.1 If your Plan G premium is $150 per month, your total annual cost is $1,800 in premiums plus $283, or $2,083 per year.2
That figure assumes you use no additional medical services beyond the Part B allowance. In reality, most retirees will have some out-of-pocket costs that Plan G does not cover — specifically the Part B deductible and any Part B excess charges (though Plan G covers excess charges in most states).
The key advantage of Plan G is predictability. Once you pay the $283 deductible, Plan G covers 100% of Medicare-approved costs for the rest of the year.3 There are no copays for doctor visits, no coinsurance for hospital stays, and no network restrictions. For a retiree on a fixed income, that certainty is valuable.
How the 2026 Medicare Landscape Affects Your Wallet
Several 2026 changes affect the medigap plan g vs medicare advantage 2026 decision. The Part B deductible rises to $283, up from $240 in 2024.1 Part B premiums are also expected to increase, though the exact 2026 figure is set each November.
Medicare Advantage plans face their own changes.4 Many Advantage plans also narrow their provider networks each year, which can disrupt care for retirees who have established relationships with specialists.
The broader trend matters: Medicare Advantage enrollment continues to grow, but so do complaints about prior authorization denials and network adequacy. For a 67-year-old in good health today, the question is whether those tradeoffs become more painful at age 75 or 80.
Breaking Down Medigap Plan G: Premiums, Deductibles, and Coverage
Plan G is the most popular Medigap plan because it covers everything except the Part B deductible.3 That means no copays for doctor visits, no coinsurance for hospital stays, and no surprise bills for outpatient surgery.
Premiums vary significantly by state and insurer. A typical range is $100 to $200 per month, depending on your location, age, and whether the policy is community-rated or attained-age-rated.2 For a 67-year-old in a moderate-cost state, $150 per month is a reasonable estimate.
The Part B deductible for 2026 is $283.1 That is the only out-of-pocket cost you face under Plan G for Medicare-approved services. If you need major joint replacement surgery, your total cost is still $283 plus your monthly premium. That is the core value proposition of Plan G.
Plan G also offers freedom of choice. You can see any doctor or specialist who accepts Medicare, anywhere in the country. No referrals, no prior authorization, no network directories to check.
Medicare Advantage 2026: Network Rules, Out-of-Pocket Limits, and Hidden Costs
Medicare Advantage plans (Part C) cap your annual out-of-pocket spending, but the cap is high.4 Many plans set their own cap lower — say $4,000 to $6,000 — but that varies by plan and region.
The tradeoff is network restrictions. Most Advantage plans use HMO or PPO networks. If your preferred cardiologist is out of network, you pay more or cannot see them at all. Prior authorization is required for many procedures, including MRIs, surgeries, and specialist referrals.
Hidden costs include copays for each service. A typical Advantage plan might charge $10 for a primary care visit, $45 for a specialist, $300 per day for a hospital stay (days 1-5), and 20% coinsurance for chemotherapy drugs. Those copays add up fast in a high-utilization year.
For a retiree with chronic conditions — diabetes, heart disease, arthritis — the cumulative copays can easily reach thousands of dollars per year before hitting the out-of-pocket maximum.
Total Annual Cost Simulation: Plan G vs Medicare Advantage Side by Side
The table below shows total annual costs for a 67-year-old under three utilization scenarios. Plan G assumes a $150 monthly premium ($1,800/year) plus the $283 Part B deductible. Medicare Advantage assumes a $0 monthly premium (common for HMO plans) with typical copays and a $5,000 out-of-pocket maximum.
| Scenario | Plan G Total Cost | Medicare Advantage Total Cost | Lower Cost |
|---|---|---|---|
| Low utilization (2 checkups, no hospital) | $2,083 | $200 | Advantage |
| Medium utilization (4 specialist visits, 1 ER visit, 1 outpatient surgery) | $2,083 | $1,850 | Advantage |
| High utilization (2 hospital stays, surgery, chemo) | $2,083 | $5,000 (OOP max) | Plan G |
The crossover point is clear. In low- and medium-utilization years, Medicare Advantage costs less. In a high-utilization year, Plan G saves you $2,917 or more.
The real question is not which plan wins in a typical year. It is whether you can absorb a $5,000 to $8,850 out-of-pocket hit in a bad year without disrupting your retirement budget.
How Social Security Timing and 401k Withdrawals Trigger IRMAA Surcharges
Income-Related Monthly Adjustment Amount (IRMAA) surcharges apply to both Plan G and Medicare Advantage. The Social Security Administration uses your tax return from two years prior to determine your Part B and Part D premiums.
For 2026, the lookback year is 2024. If you had a one-time capital gain from selling a home or a large 401k withdrawal in 2024, your 2026 Part B premium could be $400 per month or more instead of the standard $185 or so.5
This matters for the medigap plan g vs medicare advantage 2026 decision because IRMAA applies to both plans equally. However, the total cost impact is larger for Plan G because you are already paying a $150+ monthly premium on top of the surcharge.
Suppose you take a $100,000 401k withdrawal in 2024 to fund a home renovation. That pushes your modified adjusted gross income above the highest IRMAA income threshold — for example, $212,000 for single filers or $318,000 for married filing jointly.6 For a hypothetical retiree, the 2026 Part B premium rises to roughly $594 per month, and the Part D surcharge adds approximately $81 per month.
For a retiree on Plan G with a $150 premium, total monthly cost becomes $594 for Part B plus $150 for Plan G plus $81 for Part D — or $825 per month. That is roughly $9,900 per year just for premiums.
Coordinating Spousal Benefits with Your Medicare Plan Choice
If you are married, both spouses must choose their own Medicare coverage. One spouse might prefer Plan G for its predictability, while the other chooses Medicare Advantage for its lower upfront cost.
Consider a hypothetical couple: Michael, age 67, has a history of heart disease and expects high medical utilization. Jennifer, age 65, is healthy and sees a doctor twice a year. Michael chooses Plan G at $150/month. Jennifer chooses a $0-premium Medicare Advantage HMO.
Their combined annual cost in a typical year: Michael pays $2,083 (Plan G). Jennifer pays $200 (Advantage copays). Total: $2,283. If both chose Plan G, the total would be $4,166. If both chose Advantage, a bad year for Michael could cost $5,000 or more.
The spousal split strategy works because each person's health risk is independent. There is no rule requiring both spouses to use the same plan type.
Which Plan Minimizes Long-Term Risk After Age 70
Healthcare utilization rises with age. A 70-year-old is more likely to need a hospital stay than a 65-year-old. By age 75, the probability of a chronic condition requiring regular specialist care is significantly higher.
Plan G's advantage grows over time. The $283 deductible and fixed premium become more valuable as medical needs increase. Medicare Advantage's out-of-pocket maximum becomes a real risk, not just a theoretical ceiling.
Consider a retiree who chooses Medicare Advantage at 65 and stays healthy for five years. At 70, they are diagnosed with cancer. Their Advantage plan requires prior authorization for chemotherapy, limits their choice of oncologists, and charges 20% coinsurance for infusion drugs. Total out-of-pocket costs could hit the $8,850 maximum in a single year.
If they had chosen Plan G at 65, their total cost for the same year would be $2,083 — regardless of how many treatments they need.
The tradeoff is the premium difference. Over five healthy years, the Advantage enrollee saves roughly $9,000 in premiums. One bad year wipes out that savings and then some.
Your Next Step
Run your own cost simulation using your actual medical history. List every doctor visit, prescription, and procedure from the past two years. Estimate your utilization for 2026 — low, medium, or high. Compare the total cost under Plan G (premium plus $283) versus Medicare Advantage (premium plus estimated copays). If your high-utilization scenario would strain your budget, Plan G is the safer choice. If you are healthy and want to minimize monthly costs, Medicare Advantage may work — but revisit the decision every year at open enrollment.