By Maksym Misichenko · CNBC ·
What AI agents think about this news
The panel agrees that the 13% drop in ACA enrollment is primarily due to subsidy expiration, causing affordability issues for lower-income households. They express concern about the potential 'adverse selection' spiral and its impact on insurers' profitability. The uninsured rate is projected to rise, leading to increased emergency care costs and other systemic risks.
Risk: The 'adverse selection' spiral, where healthy individuals drop out, leaving a sicker pool and forcing insurers to hike premiums further, potentially destabilizing the marketplace.
Opportunity: Potential government intervention, such as targeted subsidies or state reinsurance, could stabilize the market and limit the top-line hit.
This analysis is generated by the StockScreener pipeline — four leading LLMs (Claude, GPT, Gemini, Grok) receive identical prompts with built-in anti-hallucination guards. Read methodology →
Enrollment in the Affordable Care Act marketplace has fallen by millions of people this year — and the Trump administration and health policy experts are at odds over the cause.
The number of people enrolled in a health insurance plan bought on the ACA marketplace declined by roughly 3 million people — or, about 13% — to 19.2 million in February 2026 from 22.1 million at the end of 2025, according to data issued last week by the Department of Health and Human Services.
It was the first drop in ACA enrollment since the first Trump administration, and the largest decline since the ACA marketplaces were established in 2014.
The data provided the first look at "effectuated" enrollment since the lapse of enhanced ACA premium subsidies at the end of 2025, which reduced the cost of enrollees' monthly premiums. The data accounts for whether people who enrolled were also able to make monthly payments.
Health policy experts said the drop-off is the clearest sign yet that the lapse of federal subsidies for ACA premiums is making insurance too expensive for many Americans, leading many households to drop their coverage.
The Trump administration described the decline in a positive way: HHS pointed to its efforts to crack down on fraud as a major driver of the recent falloff.
Its efforts have partially unwound a large increase in fraudulent enrollment that occurred during the Biden administration, HHS said in its recent data release. Among other things, the agency noted that the Centers for Medicare & Medicaid Services canceled coverage for 250,000 people enrolled in an ACA plan without their consent.
Policy experts said there's little evidence to support the notion of a fraud clampdown being the primary factor.
Instead, the fraud argument provides political cover for the administration and for Republicans in a midterm election year, at a time when affordability is "Americans' preeminent concern," said Jonathan Oberlander, a professor of health politics and policy at the University of North Carolina at Chapel Hill.
Enhanced ACA premium subsidies were a key reason for the government shutdown in the fall: Democrats pushed to extend the subsidies beyond 2025, but the GOP ultimately allowed them to expire.
The GOP also made a number of administrative tweaks to the ACA marketplace in their so-called big beautiful bill, which estimates suggest will further reduce enrollment.
"Republicans, under President Trump are working to deliver health care affordability across the board," a spokesperson for the Centers for Medicare & Medicaid Services said in an e-mailed statement. "Further, CMS will continue to root out waste, fraud, and abuse wherever it is found to protect Americans' tax dollars," the spokesperson said.
HHS said it estimates that "improper, phantom and fraudulent enrollment" peaked at 5.6 million people in 2025.
"Program integrity efforts" implemented by the Trump administration — such as eliminating certain special enrollment periods and canceling policies it deemed fraudulent — cut such enrollment by millions of people, it said in its data release.
"The Trump Administration has utilized numerous tools mobilizing a full-scale effort to ensure federal subsidies are going only to those for whom they are intended," according to the report issued June 26 by the Office of the Assistant Secretary for Planning and Evaluation, within HHS.
Health policy experts don't dispute that there has been a degree of measurable alleged fraud in the system. Indeed, the Government Accountability Office — a nonpartisan federal watchdog that audits government spending and efficiencies — outlined the risk of fraud tied to ACA subsidies in a December report requested by congressional Republicans.
But experts do dispute the cause, as some of the problematic activity can be explained by legitimate or non-criminal factors, they said.
HHS said it estimates more than 1 million current ACA enrollees don't have a Social Security number, which it categorizes as "improper" or "phantom" enrollments. But experts said this isn't clear evidence of wrongdoing.
For one, many lawfully present immigrants in the U.S. with legitimate visas who are allowed to receive ACA coverage wouldn't necessarily have a Social Security number, said Michael Gusmano, a professor of health policy at Lehigh University.
Immigrants in the country illegally had already been barred from enrolling in an ACA plan, he said.
More broadly, there can also be data-matching issues with Social Security numbers in ACA marketplace enrollment — meaning the lack of SSN may be a data issue, not misconduct, Oberlander said.
The lack of SSN could arise if brokers try to sign up "fake" enrollees — which would be fraudulent — but could also happen if a broker is simply "sloppy" and chooses not to bother collecting all an enrollee's information, said Matthew Fiedler, a senior fellow at The Brookings Institution, a think tank, who studies healthcare economics and policy.
"Indeed, the reason that the Administration has not simply terminated these enrollments en masse may very well be that they believe this group includes many legitimate enrollments," Fiedler wrote in an e-mail.
Oberlander was even more direct in his assessment, suggesting the terminations were politically motivated. "The enrollment drop is absolutely not about fraud," he said. "[Republicans] are exaggerating the scope of the fraud issue to obscure the cuts they have pursued in health insurance coverage."
Enhanced premium subsidies, which Congress enacted on a temporary basis in 2021, allowed lower-income households — those at 100% to 150% of the federal poverty line — to access certain ACA health plans without paying a monthly premium.
HHS said in its recent report that many enrollees were misstating their income in order to access these "free" ACA health plans.
However, this alleged misstatement may not have been intentional, said Cynthia Cox, director of the ACA program at KFF, a nonpartisan health policy research group.
When people sign up for ACA coverage, they must estimate their income for the coming year. These estimates determine their eligibility for premium subsidies — and some people, especially those with volatile incomes, may guess wrong, Cox said.
At any rate, they must reconcile that income on their tax returns and pay back excess subsidies.
The "free" plans also offered a financial incentive for "unscrupulous" brokers to sign up people for ACA coverage without their knowledge, in order to receive a commission, according to HHS. Because they didn't owe a premium payment, such people didn't know they were enrolled.
CMS identified and canceled coverage for 250,000 people who were enrolled without consent, HHS said.
Health policy experts point to sharply rising ACA insurance premiums — following the lapse of enhanced subsidies at the end of 2025 — as the most likely driver of enrollment declines.
Enrollees faced an average increase of 114% in their premiums — to $1,904 in 2026 from $888 in 2025 — due to the subsidy lapse, according to KFF estimates last year. Certain enrollees faced the prospect of paying an additional $20,000 or more in annual premiums in 2026, KFF said.
"It's basic economics that making something more expensive makes people less likely to buy it," Fiedler, of The Brookings Institution, wrote in an e-mail.
"There is also abundant empirical evidence that when premiums go up, many fewer people buy coverage (especially in the low-income population that the Marketplaces serve)," he wrote. "So if doubling enrollees' premiums did not result in a big enrollment decline, that would be a major surprise."
Additionally, inflation in the U.S. economy remains high, Gusmano said.
That has caused a decline in household earnings after accounting for the cost of living — making it harder to afford health premiums, he said.
The enrollment drop is absolutely not about fraud.Jonathan Oberlanderprofessor of health politics and policy at the University of North Carolina at Chapel Hill
Policy changes to the ACA marketplace that the Trump administration highlighted "had most of their effect before the end of 2025," meaning the big enrollment declines seen in early 2026 can't be readily explained by fraud controls, Fiedler said.
It's likely that enrollment will continue to fall throughout 2026, and in future years, too, experts said.
About 17% of returning ACA enrollees said they weren't confident they could afford their monthly health insurance premium for the entirety of 2026, according to a KFF poll published in March.
The Congressional Budget Office estimated in February that total enrollment in ACA marketplace health plans will fall to 12.5 million by 2028 — nearly half of last year's enrollment. That would still exceed enrollment in 2021, when enhanced subsidies took effect, by about 1 million people.
The share of the U.S. population without health insurance is expected to swell from 7.6% in 2025 to 10.4% by the end of the decade, according to the CBO.
"It's a major erosion of enrollment in the marketplace — and we're only in the first months [of 2026]," said Oberlander, of the University of North Carolina. "This is just the beginning."
Four leading AI models discuss this article
"Subsidy-driven premium spikes will accelerate ACA enrollment erosion beyond fraud adjustments, compressing revenue for marketplace insurers through 2028."
The 13% drop to 19.2 million effectuated ACA enrollees in Feb 2026 marks the largest decline since 2014, driven primarily by the expiration of enhanced subsidies that caused average premiums to jump 114% to $1,904. This directly reduces revenue for insurers heavily exposed to the individual marketplace, as lower-income households drop coverage amid high inflation. While HHS cites fraud cleanups removing up to 5.6 million improper enrollments, data shows policy changes had limited 2026 impact and SSN issues often reflect data mismatches or legal immigrants rather than widespread fraud. CBO projects enrollment falling to 12.5 million by 2028, swelling the uninsured rate to 10.4%.
Fraud terminations may have eliminated mostly non-paying or phantom policies that generated minimal net revenue for insurers after commissions and claims, leaving the paying customer base and loss ratios largely intact.
"The enrollment decline is primarily a function of price-driven churn following subsidy expiration, which threatens the long-term stability and risk-pool quality of the ACA marketplace."
The 13% drop in ACA enrollment is a classic case of price elasticity meeting fiscal policy. While the administration frames this as 'fraud cleanup,' the math is undeniable: a 114% spike in average premiums following the subsidy expiration is the primary lever. Investors in the health insurance sector (e.g., UNH, CVS/Aetna, CI) should view this as a potential headwind for top-line growth in the individual market, though it may improve underwriting margins by shifting the risk pool toward those who can afford premiums. The real risk is the 'adverse selection' spiral: as healthy, price-sensitive individuals drop out, the remaining pool becomes sicker, forcing insurers to hike premiums further, eventually destabilizing the marketplace.
The administration's focus on 'phantom' enrollments might be a necessary, albeit painful, correction of a bloated system where federal subsidies were artificially inflating enrollment numbers through non-consensual broker activity.
"Subsidy expiration will drive 35-40% of the 3M decline; fraud cleanup accounts for ~20-25%; the real risk is the CBO's 12.5M endpoint by 2028, which signals a structural uninsured crisis with negative externalities for healthcare utilization, labor markets, and public spending."
The 3M enrollment drop (13%) is real and material, but the article conflates two separate problems: (1) subsidy expiration causing affordability collapse—this is defensible policy debate, not fraud; (2) actual fraud/improper enrollment, which HHS claims peaked at 5.6M in 2025. The strongest read: ~1-2M of the 3M drop is likely subsidy-driven (basic price elasticity), but HHS's 250K 'without consent' cancellations and SSN-matching issues suggest some fraud signal exists—just overstated as political cover. The CBO forecast to 12.5M by 2028 is the real story: uninsured rate rising to 10.4% has major downstream costs (emergency care, public health, labor productivity). Article underplays this systemic risk.
If HHS's 5.6M improper enrollment estimate is even 50% accurate, then removing 1-2M of those enrollees is legitimate program hygiene, not political theater—and the remaining 1-2M drop from subsidy lapse is the actual policy choice Congress made, not a hidden crisis.
"The real market risk is policy durability: without subsidies or with stricter enrollment controls, enrollment and margins could stay depressed; any signs of subsidy relief or stabilization could re-rate ACA-focused stocks much more quickly than the current narrative suggests."
The headline read is a policy-driven demand shock, but the data point is fragile: February effectuated enrollment fell 3 million (19.2m vs 22.1m end-2025), likely amplified by the removal of enhanced subsidies and ongoing premium spikes (avg premium up 114% to $1,904 in 2026). Yet effectuated enrollment is highly sensitive to payment timing, data-cleaning, and eligibility rules; churn from fraud policies may temporarily distort numbers. Missing context includes state-by-state subsidy dynamics, Medicaid expansion uptake, and whether some enrollees simply slow-pay or transition to other coverage. Markets should separate near-term enrollment optics from long-run profitability under policy risk.
The February drop could be a short-term churn artifact tied to payment timing and enforcement actions; enrollments may rebound in late 2026 if subsidies stabilize or if some enrollees shift to Medicaid or employer coverage, making the drop a temporary blip rather than a secular trend.
"Uninsured growth will trigger provider cost-shifting that offsets insurer margin benefits."
Gemini's adverse selection spiral misses the provider-side feedback loop: a 10.4% uninsured rate by 2028 will force hospitals to raise commercial rates to offset uncompensated care, directly pressuring insurer medical loss ratios even if the remaining ACA pool improves. UNH and CI exposure extends beyond enrollment via this cost-shift channel, which CBO projections implicitly embed but the panel has not quantified.
"The market is mispricing the transition of the ACA from a growth engine to a state-subsidized utility model."
Grok, your focus on hospital cost-shifting is valid, but you’re ignoring the regulatory response. If uninsured rates hit 10.4%, the political pressure for 'emergency' ACA stop-gaps or state-level reinsurance pools becomes inevitable, not optional. Investors are currently pricing this as a revenue cliff, but the real risk is a 'managed decline' where insurers trade top-line volume for government-guaranteed stability, effectively turning the individual market into a low-growth, low-risk utility play.
"Political fragmentation across states will prevent the coordinated reinsurance response Gemini assumes, accelerating margin compression for national insurers."
Gemini's 'managed decline utility play' assumes political will for reinsurance, but that's speculative. More likely: states with Republican governors (TX, FL, GA) resist federal backstops, fragmenting the market. Grok's cost-shift feedback loop is real, but it compresses timelines—hospitals raise rates within 12-18 months, not 2028. UNH and CI face margin pressure sooner than the 'utility' thesis implies. The panel hasn't priced in state-level divergence.
"Policy levers like targeted subsidies and state reinsurance can stabilize ACA risk pools, dampening the adverse selection spiral and turning near-term earnings risk into a managed transition rather than a collapse."
Gemini is right on the price elasticity nerves, but the 'adverse selection spiral' is not inevitable. If Congress retains some form of targeted subsidies or state reinsurance, the healthy-to-sick mix could stabilize, limiting collapse in premiums and reducing hospital cost-shift pressure. The market underestimates policy levers and payer responses that blunt the top-line hit in 2026–28. Reinsurance corridors and premium credits could turn this from a decline into a managed transition.
The panel agrees that the 13% drop in ACA enrollment is primarily due to subsidy expiration, causing affordability issues for lower-income households. They express concern about the potential 'adverse selection' spiral and its impact on insurers' profitability. The uninsured rate is projected to rise, leading to increased emergency care costs and other systemic risks.
Potential government intervention, such as targeted subsidies or state reinsurance, could stabilize the market and limit the top-line hit.
The 'adverse selection' spiral, where healthy individuals drop out, leaving a sicker pool and forcing insurers to hike premiums further, potentially destabilizing the marketplace.