If you’re signing up for Medicare advantages this open enrollment, odds are you aren’t really enrolling within the conventional authorities program that individuals might envision. More than half of Medicare beneficiaries are actually selecting another model of this system administered by non-public firms.
Medicare, the paragon of America’s welfare state, is present process a refined however basic transformation from authorities program to public profit offered by non-public firms, a shift with main implications for each sufferers and taxpayers. This various model of Medicare, referred to as Medicare Advantage, now covers greater than half of this system’s 63 million enrollees, or about 34 million Americans — almost double its share 10 years in the past.
KFF
Fears over Medicare’s solvency have renewed the talk about how a lot the plans value the federal authorities. New information reveals Medicare Advantage enrollees have entry to solely half as many docs and well being care suppliers as sufferers on conventional Medicare. And media investigations have added to issues about how non-public firms oversee the general public advantages they’re supposed to present.
If you’re selecting between conventional Medicare and an Advantage plan, right here’s what you ought to know about the 2 variations of this system — how we bought right here, the potential drawbacks, and what might be in retailer for this system going ahead.
What is Medicare Advantage?
Medicare has historically been a government-run insurance coverage program for individuals over 65 and people with long-term disabilities. Medicare Advantage permits non-public insurers to provide their very own plans that present Medicare advantages, in addition to some extra perks not obtainable within the unique program. The secret to this system’s success is simplicity. Traditional Medicare is a fragmented program: Part A covers hospital care, and Part B covers outpatient companies. Patients should enroll in a separate Part D plan for prescription drug protection that’s administered by non-public insurers. Most individuals additionally buy supplemental protection, additional insurance coverage that helps scale back their out-of-pocket prices.
Medicare Advantage, often known as Part C, combines these advantages into one insurance coverage plan that additionally consists of an annual restrict on out-of-pocket prices, one thing that doesn’t technically exist in common Medicare.
Why Vox is overlaying open enrollment
Open enrollment, the set time interval for selecting well being advantages for the approaching yr, is a second when hundreds of thousands of individuals come face-to-face with the complexity of American medical insurance.
But the advantages to sufferers appear to come at a price to taxpayers. Though the medical insurance trade disputes these findings, MedPAC, the unbiased committee tasked with overseeing Medicare on Congress’s behalf, discovered Medicare Advantage plans value the federal authorities extra money per affected person than the unique program would have if those self same individuals had caught with the normal advantages.
Private firms are additionally making wholesome margins on their Medicare enterprise. A Kaiser Family Foundation evaluation discovered that insurers have been making extra money per affected person in Medicare Advantage than with their particular person or employer-sponsored plans. Humana, which covers 5 million beneficiaries, or roughly one in 5 individuals who have elected to go along with the Medicare various, introduced in 2023 it was dropping the remainder of its portfolio to focus solely on the Medicare Advantage market and Medicaid managed care, a model of that authorities program that’s equally run by non-public insurers with state supervision.
Patients have clearly discovered one thing to like in what Medicare Advantage gives. The program was established in 1997 to give individuals a streamlined various, a personal choice much less overt than more moderen GOP voucher proposals.
But scholarly analysis and media investigations have revealed notable downsides in turning over a program that covers America’s seniors, the individuals who need and use essentially the most well being care, to non-public firms. Medicare Advantage enrollees are extra probably to report hassle affording well being care than individuals on conventional Medicare. Some of the habits by Medicare Advantage plans, comparable to utilizing AI to determine when to cease overlaying companies for his or her enrollees, could also be changing into extra widespread within the non-public sector however continues to be remarkable for public applications.
The trade-off the United States appears to be making is accepting extra administrative bloat and extra stringent provision of advantages in trade for a extra navigable Medicare plan. The trade-off is one different nations have made as they designed common well being care applications. (An identical development is underway in Medicaid.)
But as concern grows about Medicare going through a possible monetary cliff, and proof mounts about the prices of Medicare Advantage, the dangers of the trade-off have gotten clearer. Medicare is not what it used to be: Once the epitome of government-run medical insurance, its advantages are on the verge of being primarily funneled via non-public firms. Any makes an attempt to change this system may have to wrestle with that actuality.
How Medicare Advantage bought so well-liked
Pilot applications for personal insurers’ administration of Medicare date to the Seventies, however the Medicare Advantage program was created by the Balanced Budget Act of 1997, at a time when issues about Medicare’s solvency ran excessive. Originally referred to as Medicare Choice or Part C, it was renamed Medicare Advantage in 2003, when Medicare was expanded to cowl pharmaceuticals.
The concept was to present sufferers with a less complicated Medicare plan. If you have conventional Medicare, you are combining Part A, for which most individuals don’t pay a premium, and B, for which most individuals do, with a separate Part D drug plan, and probably supplemental protection, too. With Medicare Advantage, individuals can enroll in a single insurance coverage plan that offered the complete menu of advantages.
Some Medicare Advantage plans additionally embody dental, listening to, and imaginative and prescient advantages, companies that aren’t lined by the normal program however might be essential for seniors. Medicare Advantage plans additionally set annual caps on out-of-pocket prices, which don’t apply in conventional Medicare. (Supplemental protection or Medicaid as an alternative lowers prices for many — however not all — Americans who go for the unique model of this system.)
Beneficiaries pay month-to-month premiums to buy a Medicare Advantage plan; individuals with decrease incomes qualify for subsidies. There are notable limitations in protection. In conventional Medicare, for instance, sufferers can go to any physician or hospital that accepts Medicare; Medicare Advantage has extra restricted supplier networks, and sufferers might be on the hook for greater prices if they’re handled at an out-of-network physician or hospital. A KFF evaluation printed in October 2025 discovered that Medicare Advantage sufferers may use their plan with lower than half as many physicians — 48 % — as these on conventional Medicare. Some sufferers on essentially the most stringent may obtain care from solely one-third of all suppliers who settle for the historic program.
The federal authorities pays Medicare Advantage plans a flat charge for the anticipated value of overlaying their specific clients and the insurers are required to adhere to sure guidelines about advantages and prices. But firms nonetheless have flexibility about how to run their plans and have a monetary incentive to restrict bills. The much less cash they spend, the extra they get to preserve for themselves.
Still, clients will vote with their toes and, after slower-than-expected preliminary uptake, Medicare Advantage is now rising so shortly that it has turn out to be the dominant type of Medicare.
Why the motion? In a 2021 evaluation printed in Health Affairs, Ken Terry and David Muhlestein noticed that “we’re witnessing the rapid privatization of Medicare” and provided an evidence: Medicare Advantage plans “offer beneficiaries a better deal than traditional Medicare.”
The premiums individuals pay for a Medicare Advantage plan might be considerably decrease than the mixed value of supplemental protection and a Part D plan — lower than $50 in contrast to greater than $200 on common, per Terry and Muhlestein — with the additional advantage of getting solely a single insurance coverage card. According to a 2022 Commonwealth Fund survey, the extra advantages provided by Medicare Advantage plans (comparable to dental or imaginative and prescient) and the boundaries on out-of-pocket prices have been the commonest causes seniors gave for selecting the choice over the unique program.
In normal, sufferers with conventional Medicare and folks with Medicare Advantage say they’ve comparable satisfaction with their advantages. On some metrics, the latter group excels; individuals with a Medicare Advantage plan are extra probably to have an everyday physician and to say they’ve acquired preventive well being care companies. With just a few exceptions for specific medicines, Medicare Advantage clients report fewer issues accessing their pharmaceuticals, too.
But individuals enrolled in Medicare Advantage additionally expertise a novel set of issues in contrast to individuals who select the unique program.
The potential downsides of Medicare Advantage’s progress
Those issues, primarily based on the obtainable analysis, begin with value. A better share of Medicare Advantage enrollees report having issues affording care (about 19 %, per a 2021 KFF evaluation) than these on conventional Medicare (15 %), although individuals on the unique program with out supplemental protection had essentially the most issues with affordability (30 %). (Most individuals on Medicare do buy this protection.) Black Americans and folks with decrease incomes have been extra probably to report having hassle paying for well being care whereas enrolled in Medicare Advantage.
Other findings seem worrisome, too. Medicare Advantage sufferers are much less probably to obtain medical care on the highest-rated services for his or her specific wants, in contrast to individuals with conventional Medicare, a mirrored image of extra restrictive supplier networks. Families additionally reported extra satisfaction with end-of-life care when utilizing conventional Medicare.
Specific enterprise practices by Medicare Advantage plans, and their penalties for sufferers, have additionally been known as into query by investigative reporting and authorities inquiries over the previous few years, practices that appear to run counter to Medicare’s operate as an entitlement program for Americans over 65 and people with long-term disabilities.
In 2023, STAT reported on the rising use of AI algorithms by these plans to decide when to lower off advantages for a buyer. The lead instance of their reporting was an 85-year-old lady with a damaged left shoulder, whose insurer adopted an algorithm that mentioned she ought to be prepared to go away a nursing facility and return house inside 17 days.
On the seventeenth day of her keep, the insurer mentioned it could not cowl the payments for her keep, regardless that her docs and nurses noticed that the lady was nonetheless in excessive ache and incapable of doing fundamental actions, comparable to dressing herself or going to the toilet. It took greater than a yr, and a federal decide’s order, for the affected person to obtain funds for the three extra weeks she wanted to keep within the nursing facility. Doctors shared different tales of sufferers who noticed advantages withdrawn on the finish of their life, leaving their households to battle over the leftover payments for years after their cherished one had died.
A report from federal investigators printed in April 2022 discovered that tens of hundreds of Medicare Advantage clients have been denied protection for companies they need to have been entitled to. A big variety of prior authorization denials (13 %) and fee denials (19 %) reviewed by the investigators have been for companies that ought to have been lined by this system however weren’t.
“Denied requests that meet Medicare coverage rules may prevent or delay beneficiaries from receiving medically necessary care and can burden providers,” they wrote. “Even when denials are reversed, avoidable delays and extra steps create friction in the program.”
In addition, because the New York Times reported in October 2022, a lot of the largest Medicare Advantage insurers have been the topic of federal audits that discovered they improperly billed this system and of litigation that accused them of fraud. Taken collectively, the plans overbilled Medicare by between $12 billion and $25 billion in 2020, relying on the estimate.
Though Medicare Advantage was first established as a device for reining in spending, these non-public plans as an alternative appear to be perpetuating this system’s solvency disaster.
According to MedPac, since 2004, Medicare has all the time paid extra to Medicare Advantage insurers for the price of overlaying their clients than this system would have spent if the identical beneficiaries had as an alternative been enrolled in conventional Medicare. Some years, the non-public plans have been receiving an almost 20 % markup in contrast to the unique profit construction.

MedPAC
Those excessive funds are drawing extra consideration with an insolvency disaster for Medicare Part A, which covers hospital payments, on the horizon. Part A is funded virtually fully via this system’s devoted payroll taxes. If these advantages value greater than the federal government receives in Medicare payroll taxes in a given yr, as can occur in an financial downturn, the distinction comes out of a belief fund earmarked particularly for Part A. The Medicare trustees, who challenge annual stories on this system’s funds, mission that Medicare spending will start outpacing income once more in 2024, requiring this system to dip into the belief fund. The belief fund is projected to be totally depleted by 2033 with out additional coverage adjustments.
The progress of Medicare Advantage is contributing to the monetary crunch. Those plans obtain funding primarily based on the kind of service offered to their buyer, which implies cash for hospital care comes from Part A. Annual Part A funds to Medicare Advantage plans are anticipated to enhance from about $176 billion in 2022 to $336 billion by 2030.
With revived issues over Medicare’s solvency and proof of extra spending in Medicare Advantage, policymakers are beginning to have a look at making adjustments to this system. But that gained’t be simple.
The medical insurance trade will resist large adjustments or cuts to Medicare Advantage
Health insurers are going to fiercely defend their Medicare Advantage enterprise towards any proposed cuts, because the flap over the Biden administration’s proposed fee adjustments reveals. That’s as a result of Medicare Advantage is now the trade’s most worthwhile line of enterprise. United Healthcare, the nation’s largest well being insurer and the biggest vendor of Medicare Advantage plans, has been aggressively increasing its choices for individuals in this system.

Kaiser Family Foundation
That has made insurers very protecting of their Medicare Advantage enterprise. Insurers should not fairly the lobbying drive they have been earlier than the Affordable Care Act, however they continue to be extremely influential and so they have discovered allies amongst Republicans who’ve all the time most well-liked to see Medicare turn out to be extra of a personal operation.
The Biden administration’s failed try to lower funds for Medicare Advantage plans revealed the trade’s clout. As KFF analysts defined, the Biden White House needed to crack down on overpayments in 2023 with changes to the difficult method that determines when Medicare Advantage plans need to pay again the federal authorities for improper billing. The insurance coverage trade painted that proposal as a lower, regardless that the Biden administration estimated that, when the whole lot of their proposed fee plan is considered, Medicare Advantage plans would nonetheless see a 1 % enhance in funds from the federal authorities in 2024.
Health insurers warned of premium will increase and profit cuts, “though there is no clear evidence to suggest that,” in accordance to the KFF analysts. They have been joined by Republicans, who sought to flip the tables on Biden by accusing him of proposing Medicare cuts after the president had criticized Republican plans to lower spending for this system.
“Joe Biden is trying to gut Medicare benefits. Seniors can’t trust Democrats to protect Medicare,” one Republican marketing campaign spokesperson instructed Roll Call in February. The Better Medicare Alliance, a lobbying group for Medicare Advantage plans, has began operating TV adverts asking seniors to petition the White House to reverse the proposed fee adjustments.
Though unbiased fact-checkers concluded that calling the Biden proposal a lower is inaccurate, the non-public insurers nonetheless gained. The fee charges that the administration finalized in April after the brouhaha ended up being extra favorable to the Medicare Advantage plans. The total episode demonstrated Medicare Advantage’s rising political clout and previewed the battle that might probably meet any efforts to significantly alter this system. It stays to be seen whether or not the Trump administration will make main adjustments to Medicare Advantage, although some affected person advocates fear the administration will take a lax strategy to implementing this system’s guidelines, probably leaving beneficiaries in danger.
The coverage construction of Medicare Advantage shouldn’t be with out precedent. States have outsourced a lot of the administration of Medicaid to managed care plans. Countries just like the Netherlands have arrange well being programs that use non-public insurers, working beneath strict authorities oversight, to present insurance coverage advantages to their residents. Giving individuals extra selection and a extra streamlined expertise can have its advantages, as evidenced by the recognition of Medicare Advantage within the US.
But asking non-public actors, with revenue motivations, to administer authorities advantages to which individuals are supposed to be entitled brings dangers. People are extra probably to have hassle affording well being care, and their claims are extra probably to be denied; that’s true in locations just like the Netherlands, in contrast to different nations with extra direct authorities administration, and that’s true of Medicare Advantage in comparison to the normal Medicare program.
To date, policymakers have appeared content material to let Medicare Advantage develop with out a lot moderation. Medicare beneficiaries have been attracted to its comparative simplicity. But the prices of funding this system, amid the political surroundings’s shift towards extra fiscal restraint, and the issues skilled by sufferers have put this system beneath the microscope.
It is troublesome, at this level, to think about the Medicare program with out Medicare Advantage. The query is whether or not policymakers could make it more cost effective and crack down on insurer habits that runs counter to this system’s targets. Recent occasions recommend that if they struggle, they are going to have a battle on their fingers.
Update, November 3, 9:30 am ET: This story was initially printed in 2023 and has been up to date to embody new reporting and strikes from the second Trump administration.
