Eleventh Circuit Upholds False Claims Act Whistleblower Suits in a Case Out of Florida

The U.S. Court of Appeals for the Eleventh Circuit has held that the whistleblower provisions of the False Claims Act do not violate Article II of the Constitution, reversing a ruling from a federal judge in Tampa that had thrown the future of one of the government's principal fraud enforcement tools into doubt.

The decision, issued at the start of September, came in a case brought by Clarissa Zafirov, a board certified family care physician who alleged that her former employer systematically submitted false Medicare Advantage diagnosis codes in order to inflate monthly risk adjustment payments.

In 2024, U.S. District Judge Kathryn Kimball Mizelle held that the qui tam provisions improperly allow private citizens to exercise executive branch authority without appointment, a conclusion that would have invalidated the mechanism through which most False Claims Act recoveries begin.

The Eleventh Circuit disagreed. Applying the two part test for whether someone qualifies as an officer of the United States, the court concluded that relators, the private parties who bring these suits, fail the first prong because they do not occupy a continuing position established by law and therefore are not subject to the Appointments Clause.

What qui tam actually is

The False Claims Act allows a private person with knowledge of fraud against the federal government to file suit on the government's behalf. The case is filed under seal, the Justice Department investigates and decides whether to intervene, and the whistleblower receives a share of any recovery.

The mechanism dates to the Civil War, when it was enacted to combat contractor fraud, and it was substantially strengthened in 1986. The share awarded to a successful relator ranges roughly from 15 to 30 percent depending on whether the government intervenes.

Most False Claims Act recoveries originate this way. The government lacks the internal visibility to detect billing fraud inside thousands of health systems, defense contractors and financial institutions, and the statute outsources detection to insiders who have it.

Health care accounts for the largest share of recoveries, and within health care, Medicare and Medicaid billing is the dominant category. That makes the statute unusually consequential in Florida, which has one of the country's largest Medicare populations.

The constitutional argument

The challenge rested on the Appointments Clause, which requires that officers of the United States be appointed by the President, by courts of law or by heads of departments. A person exercising significant executive authority who has not been appointed in one of those ways is unconstitutionally serving.

The argument gained traction after a Supreme Court concurrence raised the question, which prompted defendants across the country to press the issue in district courts. Mizelle's ruling was the first to accept it, which made the appeal the most closely watched False Claims Act case in the country.

The Eleventh Circuit's analysis turned on the continuity requirement. An officer must occupy a continuing position established by law. A relator files a single case, litigates it and receives a share, then has no ongoing role, which the court found disqualifying.

Because the court resolved the question on the first prong, it did not need to determine whether relators exercise significant authority, leaving that portion of the analysis undeveloped.

Why Florida is the center of this

The case arose in the Middle District of Florida and involved a Florida based medical services organization operating in the Medicare Advantage space. Florida's demographics place it at the center of Medicare Advantage growth, and with that growth has come enforcement attention.

Medicare Advantage pays plans a monthly amount per enrollee adjusted for the enrollee's diagnosed conditions. A sicker patient generates a larger payment, which creates a direct financial incentive to document conditions aggressively. The Justice Department has pursued numerous cases alleging that providers and plans crossed from documentation into fabrication.

Florida has been a consistent focus of federal health care fraud enforcement for decades, across home health, durable medical equipment, pharmacy and now risk adjustment. The state's size, its Medicare population and its density of provider organizations combine to make it fertile ground.

The Middle District of Florida, which covers Tampa, Orlando, Jacksonville and Fort Myers, handles a substantial share of that docket, and the Eleventh Circuit sits above it along with the federal courts in Georgia and Alabama.

What the ruling preserves

Had the district court ruling stood and spread, the practical effect would have been to eliminate the primary detection mechanism for federal fraud. The Justice Department would have retained authority to bring its own False Claims Act cases, but without the pipeline of insider reports that generates most of them.

Recoveries under the statute run into the billions annually across all sectors, with health care the largest component. That money returns to the Medicare trust fund and to the Treasury, which gives the question a fiscal dimension beyond the legal one.

For whistleblowers, the ruling preserves both the ability to bring cases and the financial incentive to do so. Insiders who report fraud typically face professional consequences, and the statutory share is what makes the risk rational.

For defendants, the ruling removes a defense that had begun to appear in filings nationwide and returns the litigation to the merits of whether the alleged conduct occurred.

The circuit split question

The Eleventh Circuit's decision was the first appellate ruling squarely on the question, which means there is currently no conflict among the circuits for the Supreme Court to resolve.

That could change. Defendants in other circuits continue to raise the argument, and a contrary ruling from another appeals court would create the split that typically prompts Supreme Court review.

The losing party in this case may also seek certiorari directly, though the Supreme Court takes a small fraction of the petitions filed and often prefers to wait for a split to develop.

Until then, the Eleventh Circuit's ruling governs federal courts in Florida, Georgia and Alabama, and it functions as persuasive authority elsewhere.

What happens to the underlying case

With the constitutional defense rejected, the Zafirov case returns to the district court for litigation on the merits of the allegations. Those allegations concern whether diagnosis codes submitted for Medicare Advantage risk adjustment reflected conditions the patients actually had.

Proving a False Claims Act case requires establishing both falsity and scienter, meaning the defendant knew the claims were false or acted in reckless disregard. Risk adjustment cases are frequently contested on the second element, since coding involves clinical judgment.

The Justice Department declined to intervene in this case, which means the relator is litigating it independently. Declined cases proceed less often to large recoveries than intervened ones, though they do succeed.

Resolution will take time. False Claims Act cases routinely run for years, and the constitutional detour consumed a substantial portion of this one's life already.

What it means for Florida patients and providers

For patients, the enforcement mechanism is largely invisible but affects the cost and integrity of the programs they rely on. Fraud recoveries return money to Medicare, and enforcement pressure shapes provider billing behavior.

For providers, the ruling restores a familiar compliance environment. Health systems and physician groups maintain compliance programs specifically because of False Claims Act exposure, and a constitutional invalidation would have altered those calculations considerably.

Employees of Florida health care organizations who observe billing practices they believe are fraudulent retain the ability to file under seal, and the statute's anti retaliation provisions remain in force.

Medicare Advantage enrollees in Florida, a group numbering in the millions, have an indirect stake. Risk adjustment fraud inflates program costs, which ultimately affects premiums, benefits and the trust fund's solvency.

What the decision leaves open

Because the court resolved the Appointments Clause question on the continuity prong, it did not address whether relators exercise significant authority pursuant to the laws of the United States. That portion of the analysis remains undeveloped in the circuit.

Other constitutional theories have been raised against the statute in various cases, including arguments under Article II's Take Care Clause and arguments about the separation of powers implications of private enforcement. None has succeeded to date.

The decision also does not address the statute's substantive provisions, including the materiality standard the Supreme Court addressed in its Escobar decision, which remains the principal battleground in False Claims Act litigation on the merits.

For practitioners, the effect is a return to ordinary litigation. Defendants will continue to contest falsity, knowledge and materiality, and the constitutional argument that briefly threatened the statute's foundation moves to the periphery.

What whistleblowers should know

A False Claims Act case must be filed under seal in federal district court, and the complaint is served on the government rather than on the defendant. The seal period allows the Justice Department to investigate before the defendant learns of the case.

First to file matters. Only the first relator to bring a particular set of allegations can pursue them, which means delay can eliminate a claim entirely if someone else files first on the same conduct.

The statute contains anti retaliation provisions protecting employees who investigate or report suspected fraud, and those protections apply independently of whether the underlying case succeeds.

Because the procedural requirements are technical and the consequences of error are severe, whistleblowers generally retain counsel experienced in the statute before filing. Florida has a substantial bar practicing in this area, concentrated in Tampa, Miami and Orlando.

What is next

Watch for a petition for rehearing en banc or for certiorari, either of which would extend the constitutional question's life. Absent that, the issue is settled in the Eleventh Circuit.

Watch also for how district courts in other circuits handle the argument now that an appellate court has rejected it. A persuasive published opinion from a circuit court typically reduces the frequency with which an argument is raised.

The merits litigation in Zafirov will proceed on its own schedule in the Middle District of Florida, and the outcome will be its own data point about how risk adjustment cases fare.

For Florida, the broader significance is that the state's federal courts remain the venue where a large share of the country's health care fraud enforcement plays out, and the tools available in those courts are unchanged.