G.T. v. Cigna / IQVIA — AI Healthcare Coverage Denial Class Action (D. Conn.)
E.D. Cal. · Kisting-Leung v. Cigna Corp., No. 2:23-cv-01477 (E.D. Cal.)
Patients sued Cigna in 2023 alleging its 'PxDx' algorithm reviewed and denied roughly 300,000 claims in two months — averaging 1.2 seconds per denial — without genuine physician review, violating California and federal law. Triggered a wave of similar AI healthcare-denial suits against UnitedHealth (NaviHealth) and Humana.
Technical detail
Kisting-Leung v. Cigna Corp., No. 2:23-cv-01477 (E.D. Cal., filed July 24, 2023; Judge Daniel J. Calabretta). Cal. Health & Safety Code § 1367 + ERISA + breach of contract + UCL claims tied to PxDx automated denials. Class certification briefing 2025–2026; parallel actions against UnitedHealthcare (NaviHealth) and Humana also active.
Who is protected: Patients with health-insurance claims subject to automated coverage-denial algorithms
Who must comply: Cigna Corp. and similarly situated insurers using algorithmic claims-denial systems
Key facts
| Jurisdiction | E.D. Cal. |
|---|---|
| Level | Federal |
| Status | Blocked / in litigation |
| Protection strength | Moderate protection |
| Effective date | 2023-07-24 |
| Citation | Kisting-Leung v. Cigna Corp., No. 2:23-cv-01477 (E.D. Cal.) |
| Topics | healthcare AI · automated decision-making · consumer protection |
| Last verified | 2026-06-17 |
| Official source | Kisting-Leung v. Cigna — CourtListener 2:23-cv-01477 ↗ |
Related healthcare AI rules elsewhere
- Missouri AI Therapy Chatbot Ban (SB 1019) · Enacted (not yet in effect)
- PA v. Character.AI (Fake Psychiatrist Chatbot) · Blocked / in litigation
- RI Therapy Chatbot Ban (2026) · In effect
- RI AI Companion Self-Harm Safety (2026) · In effect
- Georgia SB 544 (health insurer AI) · Enacted (not yet in effect)
- Indiana HB 1271 (AI claims downcoding) · In effect
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