The Cigna Health Insurance Claim Denial Algorithm Class Action centers on allegations that Cigna used an automated system called “PxDx” (procedure-to-diagnosis) to deny more than 300,000 health insurance claims without human medical review. The lawsuit claims that Cigna’s algorithm would flag claims based on perceived mismatches between diagnoses and the treatments patients received, and then automatically deny coverage—in some cases processing denials in just 1.2 seconds per claim. According to the allegations, this practice violated Cigna’s own internal requirements, which mandate that a human doctor must evaluate whether care is medically necessary before any claim denial occurs.
The litigation began in 2023 following investigative reporting and has advanced significantly in 2025. In March 2025, a federal judge partially denied Cigna’s motion to dismiss, allowing key claims to proceed forward. Six named plaintiffs are seeking class certification to represent other Cigna health plan beneficiaries who were affected by this automated denial system. This class action raises fundamental questions about whether insurance companies can use algorithms to replace human judgment in life-and-death medical decisions—and whether policyholders have adequate protections when machines make claims decisions.
Table of Contents
- How Did Cigna’s Claim Denial Algorithm Work?
- The Scale of Claim Denials and Impact on Patients
- The Litigation Timeline and Legal Proceedings
- What Plaintiffs Are Claiming and Cigna’s Violation of Its Own Rules
- Current Legal Status and Which Claims Are Advancing
- Who Can File a Claim and How to Determine Eligibility
- Looking Forward: What Happens Next in the Litigation
- Conclusion
How Did Cigna’s Claim Denial Algorithm Work?
Cigna’s system, called “PxDx,” was designed to identify discrepancies between a patient’s diagnosis and the procedures or treatments Cigna considered medically appropriate for that condition. For example, if a patient received a particular imaging test for a diagnosis that Cigna’s algorithm deemed inconsistent with its internal guidelines, the system would flag the claim and recommend denial. The problem, according to the lawsuit, is that these flags were being acted upon without any human medical professional reviewing whether the denial was actually justified. The speed of these denials is particularly troubling.
Claims were being denied in approximately 1.2 seconds per claim—a timeframe that makes meaningful medical review essentially impossible. A single Cigna physician could deny as many as 60,000 claims per month using the algorithm, according to the allegations, suggesting that doctors were reviewing algorithm recommendations at a pace far too rapid to constitute genuine individual medical evaluation. This system operated even though Cigna’s own fiduciary and contractual obligations required human physician review before denial. The algorithm was functioning as a filter to identify claims for potential denial, but the subsequent human review—if it occurred at all—was apparently rubber-stamping the system’s recommendations without substantive evaluation of medical necessity.
The Scale of Claim Denials and Impact on Patients
Over 300,000 claim requests were auto-denied without medical review according to the allegations raised in the lawsuit. This staggering number underscores that this was not a small or isolated incident, but a systematic practice affecting hundreds of thousands of patients across multiple Cigna plans. The lawsuit does not specify how many of these denials were eventually overturned on appeal or how many patients went without necessary care because they could not navigate the appeals process. The real-world impact on individual patients is significant.
Patients who have their claims denied must decide whether to pay out of pocket for treatment, forgo care entirely, or pursue an appeals process that requires time, documentation, and persistence. For urgent or emergency treatments, a quick automatic denial could delay or prevent necessary care. Consider a patient whose claim for cardiac imaging was denied within 1.2 seconds because the algorithm deemed the imaging inconsistent with their diagnosis—that patient might delay life-saving testing while attempting to appeal the denial or gathering additional documentation. One limitation of the current litigation is that the lawsuit’s early stages do not reveal how many patients suffered actual harm—whether denied care worsened health outcomes, whether patients paid out of pocket, or how many actually pursued appeals. The class action will need to establish causation and damages through evidence gathering and discovery.
The Litigation Timeline and Legal Proceedings
The Cigna class action lawsuit was formally initiated in 2023, prompted by investigative journalism that exposed the PxDx algorithm’s systematic use to deny claims. The case was assigned to federal court, and Cigna immediately filed a motion to dismiss in an attempt to remove it from the court system. On March 31, 2025, Federal Judge Dale Drozd issued a significant ruling: he denied Cigna’s motion to dismiss—partially. This means the judge found that certain legal claims alleged by the plaintiffs had enough merit to proceed. Specifically, the judge allowed claims of breach of fiduciary duty and unfair competition to continue.
However, the judge did dismiss the claim of wrongful denial of benefits. The plaintiffs were given 21 days to amend their complaint where the motion was granted, suggesting they need to refine or strengthen certain allegations. The fact that a federal judge allowed the case to proceed is meaningful. Motions to dismiss are often the first major hurdle in litigation; when they are denied—even partially—it suggests the judge found plausible allegations that the defendant violated applicable law. The case remains in ongoing litigation, and no settlement has been reached.
What Plaintiffs Are Claiming and Cigna’s Violation of Its Own Rules
The central claim in this lawsuit is that Cigna violated its fiduciary obligations to beneficiaries by using an automated algorithm to deny claims without human medical review. Cigna, as the administrator of health insurance plans, has a fiduciary duty under ERISA (the Employee Retirement Income Security Act) to act in the best interest of plan beneficiaries. The plaintiffs argue that relying on an automated system to pre-approve denials—rather than having a physician thoughtfully evaluate medical necessity—breaches this duty. A second major claim is unfair competition.
Cigna’s competitors generally employ human physicians to review medically complex claims decisions, making Cigna’s automated approach arguably an unfair competitive advantage. By eliminating human review, Cigna reduced its costs and potentially increased its profits at the expense of beneficiaries receiving appropriate care. The plaintiffs also note that Cigna’s own internal policies and contractual requirements explicitly mandate that a human doctor evaluate the medical necessity of care before any denial occurs. This creates a straightforward comparison: Cigna required itself to follow a certain process (human medical review) but allegedly did not follow it. The automation was being used to circumvent the company’s own safeguards, not to enhance them.
Current Legal Status and Which Claims Are Advancing
As of March 2025, the case has survived the motion to dismiss stage on specific claims. The breach of fiduciary duty claim is moving forward, meaning the plaintiffs have cleared an initial legal hurdle and can proceed to the discovery phase, where both sides will exchange documents and gather evidence. The unfair competition claim also survives, allowing the plaintiffs to argue that Cigna’s practice was deceptive or unfair compared to competitors’ approaches. However, the wrongful denial of benefits claim was dismissed by the judge.
This is an important limitation: the case is not a blanket assertion that every denial was wrong, but rather focuses on the process Cigna used to make denials (the algorithm without human review) rather than the outcomes of individual denials. This distinction may affect how damages are calculated and how the class is defined—potentially limiting recovery to proof of procedural violation rather than proof that individual claims should have been approved. Six named plaintiffs are seeking certification as a class action, meaning they would represent a larger group of Cigna beneficiaries affected by the algorithm. For a class to be certified, the court must find that the plaintiffs’ claims are typical of the larger group and that class certification is the most efficient way to resolve the dispute. The case is still in its early stages of litigation.
Who Can File a Claim and How to Determine Eligibility
The class action lawsuit involves beneficiaries of Cigna health insurance plans—both individual policyholders and participants in employer-sponsored or union plans administered by Cigna. The exact definition of the class will be determined by the court as the case progresses. Typically, class eligibility would include anyone who had a claim denied during the period in which the PxDx algorithm was in use.
Determining your own eligibility requires checking whether you held a Cigna health plan during the relevant time period and whether a claim was denied. If you received a claim denial from Cigna that you believe was processed improperly or too quickly without genuine medical review, you may potentially be part of this class. However, the specific class definition will be finalized by the court, and class members will be notified of their rights and options if a settlement is reached or a judgment is made.
Looking Forward: What Happens Next in the Litigation
The Cigna algorithm case is proceeding through the discovery phase of federal litigation. Both sides will exchange documents, depose witnesses, and gather evidence to support their positions. Cigna will likely argue that its algorithm was a tool to flag claims for review, not a final arbiter, and that human review still occurred. The plaintiffs will attempt to prove that human review was perfunctory and not meaningful.
This phase could take months or years. Future developments in this case could include a settlement offer from Cigna, a class certification decision by the court, or a trial if settlement negotiations fail. The outcome could have broader implications for the insurance industry regarding the use of automated decision-making in claims processing. If plaintiffs prevail or settle, it could pressure other insurers to strengthen human oversight of algorithmic decisions and increase transparency about how claims are evaluated.
Conclusion
The Cigna Health Insurance Claim Denial Algorithm Class Action is a significant litigation over whether an insurance company can use automation to replace human medical judgment in claims decisions. With over 300,000 claims allegedly auto-denied in just 1.2 seconds each, without physician review, the case raises serious questions about patient safety and corporate accountability. The March 2025 ruling that allowed key claims to proceed demonstrates that the court found the plaintiffs’ allegations legally plausible.
If you held a Cigna health plan and had a claim denied, monitoring this case for updates is advisable. Class members are typically notified automatically if a settlement is reached or a judgment is rendered. No settlement has been reached as of now, and litigation is ongoing. You can also contact a consumer attorney to discuss whether you have individual claims or to learn more about joining the class action when certification is finalized.