UnitedHealth Group

Following its $2.5 billion acquisition of naviHealth in 2020, UnitedHealth's Optum subsidiary deployed the nH Predict AI algorithm to determine when elderly Medicare Advantage patients should be discharged from skilled nursing facilities, inpatient rehabilitation, or long-term acute care. The algorithm set predicted discharge dates and triggered automatic coverage denials when actual stays exceeded predictions. UnitedHealth's internal target: keep patient stays within 1% of the algorithm's prediction — regardless of clinical reality. A federal court in 2025 found the case viable enough to proceed. In March 2026, a federal magistrate judge ordered UnitedHealth to produce tens of thousands of internal documents revealing whether the algorithm was intentionally designed to override physician clinical judgment. Trial is set for 2028.

• —UnitedHealthcare's post-acute care denial rate rose from 8.7% (2019) to 22.7% (2022) — the period following naviHealth's acquisition. The skilled nursing home denial rate rose ninefold in the same period.
• —The Senate Permanent Subcommittee on Investigations obtained 280,000+ pages of internal UnitedHealth documents and found employees were directed to "follow the algorithms and basically not use your clinical judgment."
• —Employees were required to compile clinical notes and file progress reports three days before the algorithm's predicted discharge date — not when the patient's clinical condition indicated readiness.
• —STAT News reported in 2023 that five former naviHealth employees described being instructed to abide by algorithm predictions even when clinical staff knew patients were not ready to leave.
• —In February 2025, the federal court denied UnitedHealth's motion to dismiss in Estate of Lokken v. UnitedHealth Group (D. Minn.). The court found the contract claims plausible: insurance policy language specified coverage decisions would be made by "clinical staff or physicians" — the plaintiffs argue an AI algorithm is neither.
• —In March 2026, a federal magistrate judge ordered UHG to produce internal documents on nH Predict reaching back to January 2017, including cost-savings projections from the naviHealth acquisition and all government investigations into its AI use. Fact discovery closes April 2027. Trial readiness: February 2028.
• —Plaintiffs allege the algorithm was designed to override physician judgment. A federal judge ordered disclosure of internal documents that would answer that question — that order is not a finding.
• —90% of nH Predict coverage denial appeals are reversed. Yet only 0.2% of policyholders ever file an appeal. A tool that loses 9 of 10 fights it picks, deployed against people who almost never fight.

The federal class action Estate of Lokken v. UnitedHealth Group (D. Minn., Nov. 2023) names two plaintiffs whose estates are pursuing the company after coverage was cut by the nH Predict algorithm over physician objection. Both patients are now dead. Their cases are not aberrations — the complaint alleges the algorithm operates as a systematic scheme to deny care to patients whose continued stay was medically necessary.

• —Gene Lokken, 91, fractured his leg and ankle in May 2022. His physician approved physical therapy. Coverage was denied after 19 days — while records documented his muscles as "paralyzed and weak." His family paid approximately $150,000 out of pocket over the following year. Lokken died in July 2023.
• —Dale Tetzloff, 74, suffered a stroke in October 2022. His physician recommended long-term nursing care. Coverage was cut after 20 days. When his family requested an explanation, the company cited confidentiality. Out-of-pocket costs: $70,000. Tetzloff died in October 2023.
• —The complaint alleges that only 0.2% of patients denied under the algorithm ever file an appeal — and that of those who do, 90% of nH Predict denials are reversed through appeals or administrative law judge rulings.
• —February 2025: Federal court denied UnitedHealth's motion to dismiss; breach of contract and good-faith claims proceed.
• —March 2026: Federal magistrate judge ordered broad discovery — UnitedHealth must produce documents on nH Predict reaching back to January 2017.

ProPublica's 2023 investigation into Christopher McNaughton, a 31-year-old student with severe ulcerative colitis, documented an extraordinary record of internal UnitedHealth communications showing deliberate suppression of a favorable independent medical review, internal calculations of cost savings from denying treatment, and a recorded phone call in which a UHC employee laughed at an appeal and stated the company was "still gonna say no."

• —McNaughton's Mayo Clinic specialist prescribed a dual-biologic regimen (cost: $2 million/year). UnitedHealth's student health division denied coverage multiple times as "not medically necessary."
• —A favorable independent medical review from Dr. Nitin Kumar was actively suppressed. Nurse Kavanaugh stated in deposition: "I didn't [save the Kumar report] because it shouldn't have existed."
• —Internal emails showed UnitedHealth executives calculated that reducing McNaughton's doses would cut costs from $1.1 million to $260,218.
• —Dr. Nady Cates, a UHC internal medical director, admitted under oath that he gave McNaughton's treating physician's opinion "zero weight."
• —A recorded call captured UHC employee Dave Opperman laughing at an appeal and stating: "We're still gonna say no."
• —McNaughton filed a federal lawsuit in August 2021. After he sought a temporary restraining order in September 2021, UnitedHealth capitulated. The case settled confidentially in February 2023.

The Department of Justice opened a criminal investigation into UnitedHealth Group's Medicare Advantage billing practices, focusing on systematic upcoding — adding high-value diagnoses to patient records without physician confirmation to inflate risk scores and drive higher federal payments. On August 14, 2025, UHG confirmed it was subject to DOJ's "formal criminal and civil requests" in an SEC 8-K filing. No indictments have been filed as of October 2026. UHG cites a court-appointed Special Master in a prior related review who concluded there was no evidence of wrongdoing. DOJ has not accepted that conclusion and continues its investigation.

• —Medicare Advantage is funded by the federal government at a per-member rate set by risk score: the sicker the patient profile, the higher the federal payment. Inflating diagnoses inflates the payment.
• —UHG's August 14, 2025 SEC 8-K states it received DOJ's "formal criminal and civil requests." The same filing states the company "has not been charged with any offense" and cites the Special Master finding. The criminal (not just civil) nature of the probe is the substantive escalation.
• —CEO Andrew Witty resigned on May 13, 2025 — the same day UnitedHealth suspended its 2025 full-year financial guidance. The timing was widely reported as connected. Witty's stated reason: "personal." He was retained as a senior adviser.
• —Witty had recorded an internal video address after the December 2024 Thompson assassination. The video was leaked to independent journalist Ken Klippenstein. In it, Witty urged employees: "I encourage you to tune out that critical noise that we're hearing right now. It does not reflect reality." He defended denial practices as necessary "to guard against the pressures that exist for unsafe or unnecessary care to be delivered in a way that makes the whole system too complex and ultimately unsustainable."
• —Witty was replaced immediately by Stephen Hemsley, the company's former CEO (2006–2017) and current board chair — the architect of the company's expansion into the model now under investigation.
• —The DOJ probe extends to Optum Rx billing practices and UnitedHealth's physician reimbursement practices. The WSJ reported the DOJ was interviewing former employees about Medicare billing across UHG and Optum.
• —In May 2024, a class action alleged that CEO Witty and two other executives sold a combined $120 million in UHG stock four months before the antitrust investigation became public.
• —Financial analysis estimates UNH stock dropped approximately 49% across 2025, wiping an estimated $300 billion in market capitalization. As of October 2026, no indictment or charges have been filed.

In January 2026, newly installed CEO Stephen Hemsley testified before the House Energy and Commerce Committee and the Ways and Means Committee in back-to-back hearings on healthcare affordability. The hearings were bipartisan in their criticism — unusual for any healthcare legislation. Months later, UnitedHealth voluntarily dropped prior authorization requirements for approximately 1,700 procedure codes starting October 1, 2026. No legislation compelled the change. The Prior Authorization Accountability Act (H.R. 9396) had not reached a floor vote as of October 2026.

• —Sen. Chris Murphy (D-CT) introduced the Protecting Patients from Automated Denials Act in July 2026, which would ban AI-generated prior authorization denials without physician review. Murphy sits on the Energy and Commerce Health Subcommittee.
• —Rep. Kim Schrier (D-WA) told Hemsley it was "unconscionable and shameful" that a constituent had been denied hospitalization following a stroke by UnitedHealth Group, per NBC News coverage of the hearing.
• —The Prior Authorization Accountability Act (H.R. 9396, 119th Congress) was forwarded from subcommittee to full committee by voice vote in June 2026, but had not reached a floor vote as of October 2026.
• —Starting October 1, 2026, UnitedHealth dropped prior authorization requirements for approximately 1,700 CPT codes — roughly 30% of its prior authorization list — across all commercial, Medicare Advantage, Community, Individual Exchange, and Oxford plans. This was a response to provider and congressional pressure, not legislative mandate.
• —The voluntary rollback covers 30% of UHC's prior authorization list. The other 70% remains. The company resisted this change for years before moving — and moved only after the Thompson assassination, the DOJ investigation, and two years of congressional pressure.

In August 2026, KFF published analysis of the first-ever CMS-mandated cross-market prior authorization transparency data covering 2025 insurer performance — 71 million enrollees, 14 insurers across Medicare Advantage, Medicaid managed care, and ACA marketplace. The data confirmed UnitedHealthcare as the highest-denying major insurer for Medicare Advantage standard prior authorization requests. This is not advocacy data. It is government-mandated, primary-source reporting analyzed by Kaiser.

• —Medicare Advantage market average denial rate: 12%. UnitedHealthcare: 17% — the highest of any major insurer in the Medicare Advantage market. Elevance (Anthem): 5%. UHC denies Medicare Advantage prior authorization requests at 3.4 times the rate of the lowest major competitor.
• —67% of Medicare Advantage prior authorization denials are overturned on appeal — meaning the majority of UHC's denials do not hold up when challenged. Combined with the 90% reversal rate documented specifically for nH Predict denials in the Lokken class action, the pattern is consistent: deny broadly, count on most patients not appealing.
• —Dually eligible enrollees — lower-income patients who qualify for both Medicare and Medicaid, who are more likely to be disabled — faced denial rates up to twice those of non-dual enrollees. The algorithm denies hardest where patients have the least capacity to fight back.
• —In the ACA marketplace segment, UHC's denial rate was 21% in 2025. Centene's ACA marketplace denial rate was 25%. The "highest major insurer" claim holds for Medicare Advantage specifically; it does not apply as a cross-market claim.
• —In June 2025, the Trump administration's CMS waived the requirement that Medicare Advantage utilization management committees include health-equity expertise. Two months later, Colorado moved in the opposite direction, expanding AI governance rules to health insurers — requiring documentation of how algorithms are used in coverage decisions. Federal policy rolled back a protection; one state tried to fill the gap.

UnitedHealth Group's 2025 financials reflect the costs of the DOJ probe, the Thompson assassination's reputational damage, and the tail of the 2024 Change Healthcare ransomware attack — but not reform. The company still posted $12.81 billion in net income on $447.6 billion in revenue. The difference from 2023's $22.4 billion is the price of scrutiny. It is not the absence of the underlying conduct.

• —2025 full-year net income: $12.81 billion — down from $22.4 billion in 2023. Revenue: $447.6 billion.
• —UHG recorded a $2.8 billion extraordinary charge in 2025, covering the continuing costs of the 2024 Change Healthcare ransomware attack, divestitures, and restructuring. This was the tail of the 2024 breach, not a new security incident.
• —Financial analysis by Equentis estimates UNH stock declined approximately 49% across 2025, wiping an estimated $300 billion in market capitalization from peak. This is a secondary financial research estimate, not a primary exchange record.
• —CEO Andrew Witty's total compensation for 2024 (his last full year): $26.3 million. CEO-to-median-worker pay ratio: 352-to-1. Brian Thompson, CEO of UnitedHealthcare (the insurance subsidiary), earned $10.2 million annually while overseeing the unit where denial rates doubled.
• —UHG suspended its 2025 full-year financial guidance on May 13, 2025 — the same day Witty resigned. Guidance was partially restored at Q4 2025 earnings. As of Q3 2026, the company had raised adjusted EPS guidance multiple times and appears to be stabilizing.
• —The company insures 49 million Americans. The collapse in net income does not represent accountability — it represents operating costs. The algorithmic denial infrastructure, the DOJ probe, and the structural conflicts of interest documented here are still active.

On December 4, 2024, Brian Thompson — CEO of UnitedHealthcare — was shot and killed outside the New York Hilton Midtown while walking to an investor conference. Luigi Mangione, 26, was arrested five days later in Pennsylvania. On August 14, 2026, Mangione pleaded guilty in federal court to two counts: interstate stalking resulting in death and cyberstalking resulting in death. There was no plea agreement. Sentencing is set for December 18, 2026. The New York State murder charge remains a separate, still-pending case.

• —The shell casings found at the scene were inscribed with the words "delay," "deny," and "depose" — a reference to the insurance industry critique phrase "Delay, Deny, Defend."
• —Mangione told the court, according to CNN and CNBC coverage of the August 14, 2026 plea hearing, that he was motivated "after years of enduring severe pain from a broken back, navigating the obstacles of the health insurance system and witnessing similar experiences of countless others."
• —The DOJ SDNY press release (August 14, 2026) confirms two counts: interstate stalking resulting in death and cyberstalking resulting in death (both carry a maximum of life in prison). There was no plea agreement. Federal sentencing guidelines suggest 24–30 years; a former federal prosecutor told CNN life in prison remains "very likely."
• —The federal plea covers the stalking/cyberstalking case. The New York State murder charge — a separate matter — may be dismissed on double jeopardy grounds following the federal plea, but that determination had not been made as of October 2026.
• —In January 2026, a federal judge threw out two of the four charges, including the murder-through-use-of-firearm charge that would have made Mangione death-penalty eligible. Death penalty is off the table.
• —A 262-word handwritten document recovered with Mangione stated that the U.S. healthcare system has "the #1 most expensive healthcare system in the world" while ranking "roughly #42 in life expectancy," and described UnitedHealth as having engaged in "abuse for immense profit."
• —Emerson College poll (Dec 11–13, 2024): 68% found the killing unacceptable; among 18–29 year-olds, 41% found it acceptable or somewhat acceptable. NORC poll (Dec 12–16, 2024): 69% said insurance claim denials bore "a great deal or moderate" responsibility for Thompson's death.
• —Within weeks of the assassination, UnitedHealthcare announced reductions in prior authorization requirements covering an additional 30% of services — changes it had resisted for years.

UnitedHealth Group operates the largest physician enterprise in the United States through its Optum subsidiary — over 90,000 employed physicians, 320+ ambulatory surgery centers, the largest pharmacy benefit manager, and following the 2024 Amedisys acquisition, the largest hospice provider. The DOJ is investigating whether Optum's physician group acquisitions create anticompetitive effects. A Health Affairs analysis found that UHC pays Optum-owned physicians 17% more than rival insurers do — rising to a 61% differential in markets where UHC holds 25% or higher market share. When the insurer also owns the doctors, the conflict of interest is not speculative. It is documented.

• —Optum Health employs approximately 90,000 physicians across the United States. UHG spent approximately $31 billion on healthcare acquisitions over a two-year period ending 2023.
• —A Health Affairs analysis found UHC pays Optum-owned physician practices 17% above what rival insurers pay in those markets — rising to a 61% differential where UHC holds 25%+ market share. This creates a documented institutional incentive for Optum to route patients toward UHC plans.
• —In Washington state, Optum dropped Humana (a direct UHC competitor) from its Medicare Advantage network, effectively redirecting enrollees toward UHC-affiliated plans. Antitrust experts noted this as a potential precedent for provider-level market manipulation to benefit the insurer parent.
• —Optum closed multi-specialty offices in Somers, NY and clinics in New Jersey and Connecticut, while dropping several competing plans from its network, including Centene's Fidelis/WellCare and HCSC's HealthSpring. New York state legislators demanded a state health department investigation.
• —According to Hudson Valley One (October 2026), in Sullivan County — an area where Optum's network contractions have reduced provider access — one OB/GYN practice remains to serve 38,707 women and girls.
• —The Amedisys acquisition closed in 2024 after a DOJ settlement requiring divestiture of clinics in 19 states. UHG now controls the largest hospice provider in the United States — the company that decides when Medicare Advantage patients are near death also decides how they spend their final months.
• —The DOJ opened a formal civil antitrust review of Optum physician group acquisitions in February 2024, separate from the May 2025 criminal Medicare fraud probe. Both involve DOJ and are distinct matters.
• —The Patients Over Profits Act — a bipartisan bill to bar insurance companies from acquiring medical practices through subsidiaries and require existing conglomerates to separate insurance and provider businesses — had not passed as of October 2026.