How Medicare Beneficiaries Get Their Coverage: What the Numbers Reveal

If you ask most Medicare beneficiaries how their coverage works, you'll get a confident answer — right up until the moment a hospital bill arrives. The reality is that Medicare coverage in America is a patchwork, and where you land in that patchwork has enormous consequences for what you pay out of pocket when something serious happens. Understanding the landscape of how beneficiaries actually get their coverage is the first step toward knowing whether your own arrangement leaves you exposed.

As of 2025, roughly 54 million people are enrolled in Medicare. According to data from KFF (formerly the Kaiser Family Foundation), approximately 51% of those beneficiaries are now enrolled in Medicare Advantage plans — private insurance alternatives to Original Medicare that bundle Part A, Part B, and usually Part D drug coverage into a single plan. That means the remaining 49% are in Original Medicare, the traditional fee-for-service program administered directly by the federal government. Within that Original Medicare group, coverage quality varies enormously depending on whether someone has added a Medigap policy, a standalone Part D drug plan, or nothing at all beyond the base program.

Among those in Original Medicare, about 1 in 5 beneficiaries nationally has no supplemental coverage whatsoever — no Medigap, no employer retiree plan, no Medicaid. These individuals are fully exposed to Original Medicare's cost-sharing structure, which is more punishing than most people realize. In 2025, the Part A inpatient hospital deductible is $1,676 per benefit period — and critically, that's not an annual deductible. It resets with each new benefit period, meaning a beneficiary who is hospitalized, discharged, and readmitted more than 60 days later faces that deductible again. After 60 days in the hospital, coinsurance kicks in at $419 per day. After 90 days, it rises to $838 per day for lifetime reserve days. There is no cap on what you can owe under Original Medicare alone.

This is precisely where hospital indemnity insurance enters the picture. A hospital indemnity plan is not the same as Medigap. It doesn't wrap around Medicare's cost-sharing structure the way a Medigap Plan G or Plan N does. Instead, it pays you a fixed cash benefit — say, $200 or $500 per day — for each day you are hospitalized, regardless of what your actual bills are. Some plans also pay lump-sum benefits for ICU admission, surgery, or emergency room visits. Because the benefit goes directly to you as cash, you can use it for anything: the hospital deductible, transportation costs, lost household income, or groceries while your spouse is recovering. This flexibility is one reason hospital indemnity plans have grown in popularity among beneficiaries who want some financial cushion but find full Medigap premiums — which can run $150 to $300 or more per month depending on age, gender, tobacco use, and state — difficult to sustain on a fixed income.

For Medicare Advantage enrollees, the picture is different but not necessarily safer. Medicare Advantage plans are required to cap out-of-pocket costs for in-network services, and in 2025 that cap is set at $9,350 for in-network and $14,000 for combined in- and out-of-network costs. That sounds protective, but it means a beneficiary with a serious illness could still owe close to $9,000 in a single year before the plan covers 100%. Many Medicare Advantage enrollees — particularly those who chose plans based on $0 premiums — don't fully appreciate this exposure until they're facing it. Hospital indemnity plans are frequently marketed as a complement to Medicare Advantage for exactly this reason: a plan paying $300 per day for a 10-day hospital stay generates $3,000 in cash benefits that can offset a significant portion of that in-network maximum.

The distribution of coverage also breaks down along income and demographic lines in ways that matter for policy and for personal planning. Dual-eligible beneficiaries — those who qualify for both Medicare and Medicaid — make up roughly 20% of Medicare enrollment but account for a disproportionate share of Medicare spending. These individuals receive Medicaid assistance that covers most or all of their Medicare cost-sharing, effectively giving them the most comprehensive coverage of any group. At the other end of the spectrum, higher-income beneficiaries are more likely to carry Medigap, which requires passing medical underwriting in most states if you didn't enroll during your initial open enrollment window. This creates a coverage quality gap in the middle: beneficiaries who earn too much for Medicaid assistance but too little to comfortably afford Medigap premiums, and who may have missed their guaranteed-issue window years ago.

That guaranteed-issue window is one of the most consequential and least understood facts in Medicare supplemental coverage. When you first enroll in Medicare Part B, you have a six-month Medigap open enrollment period during which insurers cannot deny you coverage or charge you more based on your health history. Miss that window — say, because you stayed on an employer plan and enrolled in Medicare Part B later — and you may face medical underwriting that results in higher premiums or outright denial. A handful of states offer additional protections: California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, and Oregon all have birthday rule or continuous open enrollment provisions that give beneficiaries additional windows to switch Medigap plans without underwriting. If you live in one of these states and are currently in a Medicare Advantage plan or a less comprehensive Medigap policy, it's worth checking whether your state's rules give you a near-term opportunity to upgrade.

Hospital indemnity plans, by contrast, typically have more lenient underwriting than Medigap — some are guaranteed issue up to certain ages, and most ask only a handful of health questions rather than a full medical review. Monthly premiums for a basic hospital indemnity plan can range from $30 to $100 depending on benefit levels and your age, making them accessible to beneficiaries who have been locked out of Medigap due to health history or cost. The tradeoff is that the coverage is less comprehensive: a hospital indemnity plan won't cover your Part B coinsurance for outpatient services the way Medigap does, and the fixed daily benefit may not fully cover a high-cost hospitalization. Understanding what you're buying — and what it doesn't cover — is essential before enrolling.

If you're trying to assess your own situation, start by identifying which coverage category you're in: Original Medicare only, Original Medicare with Medigap, Original Medicare with employer retiree coverage, Medicare Advantage, or dual Medicare-Medicaid. Then honestly evaluate your exposure. For Original Medicare beneficiaries without a supplement, the question is whether you could absorb a $1,676 hospital deductible — or two of them in the same year — without financial hardship. For Medicare Advantage enrollees, look at your plan's in-network out-of-pocket maximum and ask whether a hospital indemnity plan paying $200 to $500 per day would meaningfully reduce your worst-case scenario. You can review your current plan's cost-sharing details at any time through Medicare.gov's Plan Finder tool, and your State Health Insurance Assistance Program (SHIP) counselor can walk you through comparisons at no cost. To find your local SHIP office, visit shiphelp.org or call 1-800-MEDICARE.