Tracking the most important health care lawsuits in U.S. courts today
May 18, 2026 | Supreme Court rejects challenges to the Medicare drug price negotiation program
This important alert links to ”How the Litigation Tracker Works
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Search for a lawsuit or issue More than 350 cases over 17 issues
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Explore related documentation Extensive library of key filing documents
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Learn the current status of the case Realtime case updates
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Read our analysis Read our take on the most pressing cases
Issues We’re Tracking
- 340B Program 21 cases
- Affordable Care Act 72 cases 6 Topics
- Anticompetitive Practices 24 cases 3 Topics
- Artificial Intelligence 3 cases
- Consumer Protections 17 cases 3 Topics
- Cost Containment 16 cases
- Equity 49 cases 1 Topics
- ERISA 18 cases
- Federal Health Funding 46 cases 4 Topics
- Medicare Advantage 34 cases 4 Topics
- Medicare Drug Price Negotiation 22 cases
- No Surprises Act 52 cases 4 Topics
- Prescription Drug Affordability 21 cases 5 Topics
- Reproductive Health 49 cases 5 Topics
- Site-Neutral Payments 9 cases
- Transparency 6 cases

Our Team
We’re the experts on health care litigation. We’re here to make the process of navigating and understanding health care litigation easy.

Katie Keith
Director of the Center for Health Policy and the Law at the O’Neill Institute

Andrew J. Twinamatsiko
Director of the Center for Health Policy and the Law at the O’Neill Institute
Latest Updates
- Status
- Briefing is ongoing
- Court
- Colorado
- Goal
- Block enforcement of a law +1 additional goal(s)
- Status
- Appeal Filed
- Court
- Texas Northern — Fort Worth
- Goal
- Block enforcement of an agency action +2 additional goal(s)
4:25-cv-00779
Humana Inc. et al. v. Department of Health and Human Services et al.
- Filed:
- July 21, 2025
- Status
- Appeal Filed
- Court
- Texas Northern — Fort Worth
- Goal
- Declaration that agency action is unlawful +1 additional goal(s)
- Status
- Briefing is ongoing
- Court
- Tennessee Eastern — Northeastern
- Goal
- Award damages +1 additional goal(s)
0:23-cv-03514
Estate of Gene B. Lokken et al. v. UnitedHealth Group Inc. et al.
- Filed:
- November 14, 2023
- Status
-
Briefing is ongoing
Motion to Dismiss Granted in Part
- Court
- Minnesota — Fourth
- Goal
- Award damages +1 additional goal(s)
- Status
- Briefing is ongoing
- Court
- Kentucky Western
- Goal
- Award damages +2 additional goal(s)
- Status
- Briefing is ongoing
- Court
- Massachusetts
- Goal
- Award damages +1 additional goal(s)
- Status
- Briefing is ongoing
- Court
- Fifth Circuit
- Goal
- Block enforcement of an agency action +2 additional goal(s)
8:19-cv-01236
United States ex rel. Zafirov v. Florida Medical Associates, LLC et al.
- Filed:
- May 20, 2019
- Status
- Appeal Filed
- Court
- Florida Middle
- Goal
- Award damages
24-13581
United States ex rel. Zafirov v. Florida Medical Associates LLC et al.
- Filed:
- October 30, 2024
- Status
- Briefing is ongoing
- Court
- Eleventh Circuit
- Goal
- Award damages
2:19-cv-00559
United States et al. ex rel. Mazik v. Kaiser Foundation Health Plan Inc. et al.
- Filed:
- April 1, 2019
- Status
- Briefing is ongoing
- Court
- California Eastern
- Goal
- Award damages +1 additional goal(s)
25-11302
Humana Inc. et al. v. Department of Health and Human Services et al.
- Filed:
- November 25, 2025
- Status
- Briefing is ongoing
- Court
- Fifth Circuit
- Goal
- Declaration that agency action is unlawful +1 additional goal(s)
Key Dates
Defendants’ Reply Brief Due
Discovery Related Deadline
Defendant’s Response Brief Due
Motions to Seal Due
Hearing on Motion to Dismiss
Plaintiffs’ Response to Motion to Amend Judgment Due
Discovery Hearing
Plaintiff’s Response to Motion to Dismiss Due
Defendants’ Motion to Dismiss Due
Deadline for Seeking Leave to Amend
Deadline for Fact Discovery
Case Management Plan and Proposed Scheduling Order Due
Plaintiffs’ Brief Due
Joint Status Report Due
Hearing on Motion for Summary Judgment
Plaintiff’s Expert Disclosure Due
Joint Status Report Due
Plaintiffs’ Opening Brief Due
Status Conference
Response Due
Fact Discovery Cut Off
Plaintiffs’ Response Brief Due
Scheduling Conference
Joint Status Report Due
Hearing on Motion to Dismiss
Plaintiffs’ Opening Brief Due
Oral Argument
Status Report Due
Defendants’ Brief Due
Plaintiffs’ Opening Brief Due
Plaintiffs’ Response Brief Due
Plaintiff’s Brief Due
Plaintiffs’ Response to Motion to Dismiss Due
Plaintiffs’ Opening Brief Due
Deadline to Amend Pleadings
Defendants’ Response to Motion to Strike Due
Oral Argument
Defendant’s Brief Due
Hearing on Motion to Dismiss
Declarations Re: Class Certification Due
Joint Status Report Due
Joint Status Report Due
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