The Trump administration has canceled about 315,000 Affordable Care Act Marketplace enrollments covering more than 760,000 people, saying investigators determined that the enrollments were unauthorized.
The Centers for Medicare & Medicaid Services says ending the associated federal premium subsidies should return about $2.2 billion in taxpayer funding. The administration is also reviewing hundreds of thousands of additional enrollments and imposing new restrictions on insurance brokers.
The action addresses documented vulnerabilities in the ACA enrollment system, but health-policy experts are asking CMS to disclose more about how it determined which enrollments were unauthorized and whether legitimate customers could have lost coverage.
Background
The ACA Marketplace provides private health insurance to people who generally do not receive coverage through an employer or government program. Federal premium tax credits reduce the cost for eligible households.
Enrollment expanded sharply after Congress temporarily increased those subsidies beginning in 2021. Those enhanced subsidies expired at the end of 2025. About 19.2 million people had active Marketplace coverage in February 2026, down from 21.8 million a year earlier.
The rapid expansion also brought concerns about improper enrollment. Brokers can receive commissions for enrolling customers, and federal investigators have identified cases in which people were placed in plans or switched between plans without their knowledge.
A December 2025 Government Accountability Office investigation demonstrated weaknesses in enrollment controls. GAO created 20 fictitious applicants for 2025 and found that 18 were still receiving subsidized coverage as of September. GAO cautioned that its test demonstrated vulnerabilities but could not be used to estimate how much fraud exists across the entire Marketplace.
What the Administration Is Doing
CMS says it worked with health insurers to investigate suspicious enrollments and canceled those it confirmed were unauthorized on August 31. Vice President JD Vance described the affected group as including nonexistent people, ineligible applicants and real people enrolled without their knowledge.
The administration says another roughly 419,000 enrollments will receive additional verification before officials determine whether those customers remain eligible.
CMS is also targeting brokers. The agency issued notices to 569 brokers that it says submitted 2026 applications at statistically implausible rates without basic identifying information such as Social Security numbers.
Separately, CMS has temporarily stopped new brokers from registering for the federal Marketplace through February 1, 2027. Existing authorized brokers can continue operating.
What Different Sides Are Saying
The Trump administration says the actions protect both consumers and taxpayers. CMS Administrator Mehmet Oz argues that unauthorized enrollment can leave people unknowingly insured, expose them to tax complications and direct federal subsidies to insurance policies that should never have existed.
Fact-check: Fraud vulnerabilities are documented independently of the administration. GAO successfully obtained subsidies for fictitious applicants and identified potential Social Security number misuse and unauthorized enrollment changes. However, GAO specifically warned that its small covert test cannot establish the overall rate of fraud in the Marketplace.
The administration has made much broader estimates. A June HHS analysis estimated that 2.6 million remaining 2026 enrollments could be improper, fraudulent or “phantom” enrollments in which people do not know they have coverage.
Fact-check: That 2.6 million figure is an estimate, not a count of individually proven fraudulent cases. The analysis uses enrollment patterns, claims activity and other data to estimate suspected improper enrollment.
Health-policy experts generally agree that unauthorized enrollments should be canceled but question whether the government has disclosed enough information about this particular operation. Cynthia Cox of KFF told the Associated Press that the key issue is whether the process correctly identified all of the people whose coverage was terminated.
Former CMS official Ellen Montz similarly said the administration has taken useful steps against actual fraudsters but that consumers may now discover that their coverage was canceled and ask why.
Fact-check: CMS says the 315,000 enrollments were canceled only after review with insurers confirmed they were unauthorized. The agency has not publicly released case-level data or a detailed methodology that would allow outside researchers to independently evaluate that conclusion.
The National Association of Benefits and Insurance Professionals has also criticized the temporary freeze on new broker registrations. The trade group argues that an industry-wide moratorium penalizes legitimate brokers instead of concentrating enforcement on people who commit fraud.
Why This Matters Beyond Fraud
The crackdown is occurring during an already difficult year for the ACA Marketplace. Enhanced federal subsidies expired at the beginning of 2026, increasing what many customers pay for coverage. KFF found that average monthly premium payments rose substantially while Marketplace enrollment fell by nearly three million people compared with 2025.
That makes the distinction between fraudulent and legitimate enrollment especially important. Removing unauthorized policies can protect taxpayers and people whose identities were used without permission. Incorrectly canceling legitimate coverage, however, could leave eligible people uninsured during a period when replacing coverage may already be more expensive.
Note on Scope
The administration’s announcement does not mean that 760,000 people were individually proven to have committed fraud. CMS says the canceled group includes people who may have been enrolled without their knowledge as well as applicants who were not eligible. The 760,000 figure refers to individuals covered by approximately 315,000 canceled enrollments.
CMS says it will continue investigating suspected unauthorized enrollment and recovering improper subsidies. The full number of affected consumers and the results of the additional verification reviews are therefore not yet known.
Related Links
- CMS: Marketplace Fraud Crackdown
- CMS: Federal Marketplace Anti-Fraud Actions
- AP: ACA Enrollment Cancellations
- Reuters: CMS Cancels Marketplace Policies
- GAO: ACA Fraud Risks
- KFF: 2026 Marketplace Enrollment
Discussion Questions
- How much evidence should the government require before canceling someone’s health insurance?
- Who should be responsible when a broker enrolls someone without permission?
- What safeguards could reduce ACA fraud without making enrollment unnecessarily difficult?
- Should CMS publicly disclose more information about how it identified unauthorized enrollments?
- Does GAO’s ability to enroll fictitious applicants demonstrate a serious problem even though its test was small?
- How should policymakers distinguish fraud from administrative mistakes or incomplete documentation?
- Is temporarily blocking all new brokers a reasonable response to fraud involving some brokers?
- What rights should consumers have if their coverage is canceled incorrectly?
- How might higher insurance premiums affect efforts to identify unusual or fraudulent enrollment patterns?
- What balance should the government strike between preventing improper spending and making health insurance easy to obtain?
