ACA marketplace fraud enforcement is intensifying as the Centers for Medicare & Medicaid Services moves to cancel unauthorized health insurance enrollments, recover federal subsidies and temporarily restrict certain new brokers from entering the federally facilitated Marketplace. CMS said it canceled approximately 315,000 enrollments covering more than 760,000 people after determining the coverage had been created without proper authorization. The agency expects the action to lead to roughly $2.2 billion in returned advance premium tax credit payments.
The enforcement push arrives just ahead of 2027 open enrollment and represents one of the federal government’s most aggressive recent efforts to address improper ACA enrollments.
ACA Marketplace Fraud Triggers Mass Cancellations
CMS canceled the affected policies on August 31, 2026, following reviews conducted with health insurance companies.
According to CMS, the enrollments had been confirmed as unauthorized through its existing investigation process. Federal rulemaking materials also pointed to cases involving unresolved citizenship or immigration documentation and situations where insurers could not identify claims activity or successfully contact consumers associated with the policies.
The cancellation involved 315,000 policies but more than twice as many individuals because a single Marketplace policy can cover multiple members of a household.
ACA Marketplace Fraud Could Cost Billions
CMS says improper enrollments can generate substantial federal spending because most HealthCare.gov consumers receive advance premium tax credits, or APTCs, that lower monthly premiums.
The new interim final rule estimates the potential annual cost of agent- and broker-related noncompliance using two different methodologies.
One produces an estimate of approximately $1.5 billion, based partly on confirmed unauthorized enrollment and plan-switching complaints. A broader methodology produces an estimate of about $6.6 billion, based partly on differences in zero-claim utilization between on-Exchange and unsubsidized off-Exchange plans.
CMS acknowledges that the higher figure could overestimate improper spending because zero medical claims do not automatically indicate an unauthorized enrollment.
That distinction is important. The estimates represent models of potential improper spending, not confirmed fraud losses.
Broker Registration Freeze Begins Immediately
CMS is also temporarily pausing registration for certain new agents and brokers seeking to participate in federally facilitated Exchanges for plan year 2027.
The moratorium applies to agents and brokers who do not already have an active 2026 Exchange Agreement with CMS. It is scheduled to remain in place until February 1, 2027.
The restriction does not apply to State-based Exchanges.
CMS says the pause will give it time to implement stronger identity verification, authentication, monitoring and other program-integrity safeguards before additional brokers gain access to federal Marketplace enrollment systems and consumer information.
ACA Marketplace Fraud Focuses on New Brokers
CMS says newly registered agents and brokers have shown disproportionately high rates of questionable activity.
During the summer, CMS issued 569 notices of intent to terminate Exchange Agreements to agents and brokers whose 2026 applications showed statistically unusual patterns, including applications missing important identifying information such as Social Security numbers.
Among this group, newly registered brokers accounted for about 30% of those flagged even though newer registrants represented a much smaller share of all brokers with active enrollments.
CMS also reported that applications connected with this group were more likely to have unresolved income issues, missing Social Security numbers and unresolved citizenship or immigration verification issues.
Since January 2026, the agency has issued termination notices involving more than 200 agents and brokers it identified as noncompliant.
Unauthorized Enrollment Can Harm Consumers
The federal government’s concern is not limited to subsidy spending.
Unauthorized enrollment can directly affect consumers.
If someone is placed into a plan or switched to another plan without consent, they may unexpectedly lose access to physicians, specialists or prescription drugs. They could also face gaps in coverage or medical bills when they discover that their insurance has changed.
Improper enrollment can also create tax complications because premium tax credits are reconciled through the federal tax system.
For that reason, CMS says protecting personally identifiable information and preventing unauthorized plan changes are central objectives of the new rules.
Insurers Will Face More Verification Work
Health insurers are also expected to play a larger role in detecting questionable enrollments.
CMS says it will continue working with issuers to identify potentially unauthorized coverage, investigate those cases, cancel confirmed unauthorized policies and recover associated federal subsidies.
That could mean greater emphasis on contacting members, reviewing utilization patterns and sharing information with federal regulators when enrollment activity appears suspicious.
The administrative burden could increase in the short term, but CMS argues that stronger verification should reduce the resources insurers currently spend investigating and reversing improper enrollments.
Broker Groups Question Broad Restrictions
Not everyone supports the temporary registration moratorium.
The National Association of Benefits and Insurance Professionals criticized the blanket freeze and argued that federal regulators should target individual bad actors rather than potentially limiting legitimate new agents entering the Marketplace. Reuters reported that the group warned broader restrictions could affect consumers who rely on brokers for enrollment assistance.
That concern highlights the policy trade-off.
Brokers play an important role in helping consumers compare plans, understand subsidies and complete complicated enrollment processes.
A strong anti-fraud policy therefore has to prevent unauthorized activity without unnecessarily reducing access to legitimate enrollment assistance.
ACA Enrollment Is Already Under Pressure
The enforcement changes arrive during a challenging period for the ACA Marketplace.
Enrollment declined in 2026 after enhanced premium subsidies expired at the end of 2025. Becker’s previously reported that effectuated ACA enrollment fell from about 22.1 million people in February 2025 to 19.2 million in February 2026.
Insurers are also preparing for the 2027 coverage year amid rising premiums and multiple carrier exits or market reductions.
That makes accurate enrollment especially important because improper subsidies and unauthorized policies can distort both federal spending and insurers’ understanding of their risk pools.
ACA Marketplace Fraud Enforcement Will Continue
CMS has made clear that the August cancellations and broker moratorium are not the end of its enforcement strategy.
The agency plans additional work with insurers, continued termination of noncompliant brokers and stronger safeguards around Marketplace enrollment systems.
The interim final rule also creates authority for HHS to impose future temporary broker-registration moratoria when conduct presents what the agency considers an unacceptable program-integrity risk.
For consumers, insurers and brokers, the practical message is clear: ACA marketplace fraud prevention is moving toward stricter identity verification, closer broker oversight and more aggressive review of suspicious enrollment patterns.
The challenge will be ensuring those controls stop unauthorized activity while preserving legitimate access to ACA coverage and qualified enrollment assistance as the 2027 enrollment season approaches.
For more healthcare industry updates, insights and news, visit DistilINFO. Click here to subscribe to stay informed
