Eleventh Circuit Upholds Whistleblower Suits Under the False Claims Act in a Florida Medicare Case

The U.S. Court of Appeals for the Eleventh Circuit ruled on September 1 that the qui tam provisions of the False Claims Act do not violate the Appointments Clause of Article II of the Constitution, reversing a Florida district court decision that had threatened the most important fraud enforcement tool the federal government has.

The case is Zafirov v. Florida Medical Associates LLC. Dr. Clarissa Zafirov, a board-certified family care physician, sued her former employer, doing business as VIPcare, alleging that it systematically submitted false Medicare Advantage diagnosis codes in order to inflate monthly risk-adjustment payments from the federal government.

The appeals court disagreed with a 2024 ruling by U.S. District Judge Kathryn Kimball Mizelle of the Middle District of Florida, who had found that the whistleblower provision improperly allows private citizens to exercise executive branch authority. The Eleventh Circuit vacated the dismissal and sent the case back for the district court to address the defendants' remaining constitutional arguments under the Take Care Clause and the Vesting Clause.

What a qui tam action is

The False Claims Act dates to the Civil War, enacted to combat fraud by contractors supplying the Union Army. Its distinguishing feature is the qui tam provision, which allows a private person with knowledge of fraud against the government to file suit on the government's behalf.

The person filing, called a relator, files the case under seal while the Department of Justice investigates and decides whether to intervene and take over the litigation. If the government declines, the relator may proceed alone.

Successful cases return money to the Treasury, and the relator receives a statutory share of the recovery, typically between 15 and 30 percent depending on whether the government intervened. That financial incentive is the mechanism that surfaces fraud the government would not otherwise detect.

Qui tam actions have historically accounted for the large majority of False Claims Act recoveries, and health care fraud accounts for the largest share of those cases by dollar value.

The constitutional argument

The challenge rested on the Appointments Clause, which governs how officers of the United States are appointed. The argument was that a relator prosecuting a case on the government's behalf exercises significant executive authority and therefore must be an appointed officer, which relators plainly are not.

Judge Mizelle accepted that reasoning in 2024, a ruling that drew national attention precisely because its logic, if adopted broadly, would invalidate the qui tam mechanism entirely.

The Eleventh Circuit rejected it. The panel's holding means qui tam suits remain constitutional within the circuit, which covers Florida, Georgia and Alabama.

The court did not resolve every constitutional question. It remanded for the district court to evaluate arguments under the Take Care Clause, which requires the President to take care that laws are faithfully executed, and the Vesting Clause, which vests executive power in the President.

Why Florida is where this happened

Florida is the largest Medicare Advantage market in the country by enrollment, a consequence of having the largest population of Medicare-eligible residents and a mature managed care sector.

Medicare Advantage pays plans a monthly per-member amount adjusted for the health status of each enrollee, a system called risk adjustment. Sicker patients generate higher payments, which creates a direct financial incentive to document more diagnoses.

That incentive structure has made risk-adjustment coding one of the most active areas of federal health care fraud enforcement nationally, and Florida's market size makes it the center of gravity for those cases.

The allegations in Zafirov, that diagnosis codes were submitted that did not reflect the patients' actual conditions, describe the core theory in most risk-adjustment cases.

What was at stake

Had the district court ruling stood and spread, the practical effect would have been to remove the primary engine of federal fraud recovery. The Department of Justice does not have the investigative capacity to detect most health care fraud on its own; it relies on insiders coming forward.

For Florida specifically, that would have meant reduced scrutiny of the largest Medicare Advantage market in the country at a moment when enrollment continues to grow.

The financial stakes are substantial. False Claims Act recoveries run into the billions annually, and treble damages plus per-claim penalties make the exposure for defendants severe enough to shape compliance behavior across the industry.

That severity is also the basis for the criticism. Defense-side practitioners have long argued that the combination of treble damages, penalties and financially motivated private plaintiffs produces settlement pressure disproportionate to the underlying conduct.

What it means for Florida patients

Medicare Advantage covers a large share of Florida seniors, and the integrity of the risk-adjustment system affects them indirectly through program costs and directly through what appears in their medical records.

Diagnosis codes submitted for payment purposes become part of a patient's documented medical history. A code that does not reflect an actual condition can affect future care decisions, insurance underwriting in other contexts and the patient's own understanding of their health.

Program costs matter too. Medicare spending affects premiums, trust fund solvency and the political sustainability of the program, all of which fall on beneficiaries eventually.

For Florida's large health care workforce, the ruling preserves the legal protection and financial incentive for employees who report fraudulent billing practices.

The Eleventh Circuit's broader docket

The qui tam decision was one of several notable Eleventh Circuit rulings in September involving Florida parties, including cases captioned Burge v. Sheriff of Manatee County decided September 25, Yeyille v. Greenberg Traurig decided September 24, and United States v. Alvarez Garcia also decided September 24.

The Eleventh Circuit is the federal appellate court with jurisdiction over Florida, Georgia and Alabama, which means its rulings bind all federal district courts in Florida and set the law for a substantial share of the nation's health care and immigration litigation.

Because Florida generates so much federal litigation in health care, immigration and financial services, the Eleventh Circuit's docket carries national significance beyond its three-state footprint.

The court has also issued notices seeking public comment on proposed amendments to its own rules, a routine procedural matter that federal district courts in Florida have circulated.

What it means for Floridians

For Florida health care employees, the ruling preserves the ability to bring a qui tam action, which is the principal legal route available to someone who observes fraudulent billing from inside an organization.

For Florida health care companies, the compliance stakes remain where they were, which means documentation standards and coding audits retain their importance.

For taxpayers, the ruling preserves a recovery mechanism that returns substantial sums to the Treasury annually, a meaningful share of it from cases originating in Florida.

For the legal question itself, the decision resolves it within the Eleventh Circuit but not nationally.

How Medicare Advantage risk adjustment works

Understanding the allegations requires understanding the payment mechanism. Traditional Medicare pays providers for each service delivered. Medicare Advantage instead pays private plans a fixed monthly amount per enrollee, and that amount is adjusted upward for enrollees whose documented health conditions predict higher costs.

The adjustment uses a risk score built from diagnosis codes submitted during the year. A patient documented with diabetes, congestive heart failure and chronic kidney disease generates a substantially higher monthly payment than a patient with none of those conditions, which is the system working as designed since sicker patients genuinely cost more to care for.

The vulnerability is that the plan benefits financially from more diagnoses being documented, and the plan or its affiliated providers control the documentation. Federal enforcement in this area has focused on diagnoses submitted without clinical support, diagnoses derived from in-home assessments that generate no treatment, and retrospective chart reviews that add codes without removing unsupported ones.

The allegations in Zafirov, that codes were submitted to inflate monthly risk-adjustment payments, track that pattern. Whether they are proven is a question the district court has yet to reach, because the case was dismissed on constitutional grounds before the merits were addressed.

Florida's exposure to this enforcement area

Florida has more Medicare Advantage enrollees than any state except California, and a higher penetration rate than most, meaning a larger share of Florida's Medicare-eligible population is enrolled in a private plan rather than traditional Medicare.

The state also has a dense network of physician practices organized specifically around Medicare Advantage contracting, including large primary care groups that take on financial risk for patient populations. That business model concentrates both the clinical coordination benefits and the coding incentives in the same organizations.

Federal prosecutors in the Middle and Southern Districts of Florida have brought a substantial volume of health care fraud cases, and Florida is consistently among the states with the highest recoveries under the False Claims Act.

That history is why a constitutional ruling on qui tam actions issued by the Eleventh Circuit has outsized practical consequences for Florida's health care sector specifically.

What's next

The case returns to the Middle District of Florida for consideration of the remaining constitutional arguments under the Take Care Clause and the Vesting Clause, which means the litigation is not finished.

The defendants could seek further review, including en banc consideration by the full Eleventh Circuit or a petition to the U.S. Supreme Court.

Similar Appointments Clause challenges have been raised in other circuits, and a split among the circuits would substantially increase the likelihood of Supreme Court review.

The Supreme Court's new term begins October 5, and whether the qui tam question reaches it in this term or a later one depends on how the remaining proceedings unfold in Florida.