Medicare’s Initial Enrollment Period offers two options that look nothing alike on the enrollment screen. Plan A is a Medicare Advantage HMO with a $0 monthly premium. Plan B is Original Medicare plus a Medigap policy that runs $150 to $250 a month. The math looks settled before the reader scrolls.
One figure complicates it, and it sits inside the Advantage plan’s Summary of Benefits: a maximum out-of-pocket limit of $9,250 in-network, with a combined in- and out-of-network cap of $13,900. Those are the federal ceilings; the average enrollee actually faces a lower limit, around $5,421 for in-network care. But the average is not the point. The $9,250 marks the worst case a Medicare Advantage plan can hand you in 2026, the hard ceiling your costs reach before the plan starts covering 100 percent of allowed expenses.
Who This Applies To
Roughly 35 million people carry Medicare Advantage, and most will never reach the in-network cap in a given year. A healthy enrollee with a few primary-care visits may pay almost nothing beyond the Part B premium. The catch matters for the year a reader does not see coming: a cancer diagnosis, a hip replacement with complications, or a stroke that pulls in specialists outside the network.
The Mechanic: What the $0 Premium Is Actually Pricing
Original Medicare alone sets no out-of-pocket maximum. Skip a Medigap policy, and you can face open-ended 20 percent coinsurance on Part B services, plus hospital coinsurance of $434 a day for days 61 through 90 and $868 a day for lifetime reserve days. Medigap Plan G caps that exposure at the 2026 Part B deductible of $283 and covers most cost-sharing beyond it.
Medicare Advantage handles the cap differently. The plan absorbs catastrophic risk, and in exchange it steers your care through a network and a prior-authorization system. That $9,250 in-network cap holds only if every provider, hospital, and imaging center stays in network all year. Out-of-network care counts against the combined $13,900 cap on PPO plans, and HMO plans generally cover none of it except in emergencies.
Two costs fall outside that cap entirely. Part D drug spending runs on its own track, with a separate $2,100 cap in 2026, so someone on an expensive specialty drug can hit both ceilings in one year. And the Part B premium itself, $202.90 a month in 2026, comes due under either path.
A Healthy Year Versus a Sick Year
The decision narrows to two scenarios. In a healthy year, the Advantage enrollee pays the Part B premium and little else, while the Original-Medicare-plus-Plan-G enrollee pays that same premium plus $150 to $250 a month for the supplement, roughly $1,800 to $3,000 a year for coverage they barely touch.
In a sick year that stays in network, the Advantage enrollee can owe up to $9,250 in cost-sharing, plus drug costs up to the $2,100 Part D cap. The Plan G enrollee owes the $283 deductible and the premiums already paid, and the policy picks up most other Medicare-covered services.
The break-even arrives when one bad year erases several years of premium savings. This is not a binary choice between a scam and a perfect plan. It is a calculated trade-off that turns on health status, provider preferences, and tolerance for prior authorization.
The Non-Dollar Catches
Cost is only part of what the cap hides. Advantage plans lean on networks and prior authorization to manage utilization, and those tools bite hardest when care gets complicated. The specialist at a top cancer center may sit out of network. An MRI may need approval before you can schedule it. Advantage limits you to the specialists in the network, and in most cases you cannot simply choose the care you want.
Plan stability matters too. Nearly 3 million Medicare Advantage members had to switch plans for 2026 as insurers exited markets or trimmed their offerings. A reader who picks a plan for its drug formulary or its preferred hospital can lose either at the next plan year without lifting a finger.
The Switch-Back Trap
The choice between Advantage and Original Medicare runs closer to one-way than the enrollment screen suggests. Moving from Original Medicare into a $0-premium Advantage plan is easy.
Moving back usually means applying for a Medigap policy after the one-time, 6-month Medigap open enrollment window that follows Part B enrollment has closed. In most states, insurers can then medically underwrite that application and deny coverage or raise the premium based on your health history.
A few states, including New York, Connecticut, Massachusetts, and Maine, grant broader guaranteed-issue rights, but the federal default does not. That asymmetry is what makes the first decision weigh more than the monthly premium suggests. A reader who picks Advantage at 65 in good health may not be able to switch to Original Medicare plus Medigap at 72 after a diagnosis.
Practical Considerations
Every Advantage plan’s Summary of Benefits lists the in-network and combined out-of-pocket maximums alongside the premium. The plan directory shows whether your current primary care doctor, the specialists you already see, and your preferred hospital stay in network for the plan year, and the Part D formulary lists covered prescriptions.
If you lean toward Original Medicare, your Medigap window opens with Part B and lasts six months. New enrollees most often compare Plan G and Plan N, with high-deductible Plan G a third option when premium is the binding constraint. Outside that window, guaranteed-issue rights turn state-dependent and narrow. If you lean toward Advantage, treat the plan as an annual decision rather than a default: the Annual Election Period each fall lets you re-shop, because the formulary, network, and cost-sharing can all shift under an auto-renewed enrollment.
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