Billionaire entrepreneur Mark Cuban isn't holding back when it comes to what he sees as regulatory failure in the health insurance industry. On Thursday, he took to X to question why the SEC and DOJ have remained silent on what he describes as obvious fraud by health insurers.

The Zero-Premium Problem

At the heart of Cuban's complaint is a troubling issue: health insurers have failed to verify whether people enrolled in zero-premium plans actually knew they were being signed up. Cuban called this "fraud" and a "material risk" to insurer earnings, pointing out that $35 billion in aggregate premium tax credits could and should be returned to taxpayers.

He even threw some shade at short sellers, wondering if they were paying attention to this opportunity, since they "typically conduct more due diligence than anyone."

Cuban's comments responded to a Politico report revealing that health insurers are finally admitting to widespread fraud in the Affordable Care Act marketplace. This represents a dramatic about-face after years of downplaying the problem. The timing is interesting, too: insurers are making this admission while simultaneously lobbying Republicans to renew the enhanced Obamacare subsidies that have significantly boosted their profits since 2021. So far, GOP lawmakers aren't biting, showing little appetite for maintaining the higher subsidy levels enacted during the pandemic.

This isn't Cuban's first rodeo criticizing the health insurance industry. The Shark Tank star has previously argued that skyrocketing deductibles have effectively turned health insurance into a "scam." His logic: when deductibles are so astronomical that people avoid seeking care despite paying premiums, they'd actually be better off ditching insurance and paying out-of-pocket.

Federal Crackdown Gains Momentum

The DOJ hasn't been completely asleep at the wheel. Earlier this year, authorities dismantled a massive $14 billion healthcare fraud scheme, charging over 320 individuals and seizing more than $245 million in assets. The operation exposed fraudsters operating from Russia, Eastern Europe, Pakistan, and other countries.

UnitedHealth Group (UNH) has found itself squarely in the crosshairs of federal investigators examining its Medicare practices. The probe, which launched at least a year ago, focuses on allegations that the company used doctors and nurses to inflate payments from the government. Former employees have been cooperating with federal investigators, adding fuel to the fire.

UnitedHealth has pledged to cooperate with both criminal and civil inquiries from the DOJ while maintaining that its operations are above board. The market hasn't been convinced. UnitedHealth stock has cratered 33.26% so far in 2025 as fraud reports continue to surface.

For Cuban, the question remains: if the fraud is this obvious and the financial exposure this enormous, why aren't regulators moving faster?