Katherine Anne Trefz
Williams & Connolly
- Address of record
- 680 Maine Avenue SW, Washington, DC 20024, 202-434-5038
- ktrefz@wc.com
- Phone
- (202) 434-5038
- Fax
- Fax Not a member
Contact details as filed with the court in the cases below.
Case history
Publicly tracked matters where this attorney is listed as counsel.
Zelis Repricing Antitrust Class Action
A proposed class action against Zelis, apparently concerning antitrust claims over repricing of healthcare claims or services. The docket indicates the court recently ruled on a motion to compel, but no further details are provided in the available text. These are allegations in a newly filed case and not proven facts.
- Filed
- March 28, 2025
- Represents
- Aetna, Inc.
Multiplan Health Insurance Class Action
A proposed class action against Multiplan, apparently concerning practices related to health insurance provider services. The caption and nature of suit provide limited detail, but the case is docketed as a personal injury health care/pharmaceutical product liability action. These are allegations in a newly filed case, not proven facts.
- Filed
- August 1, 2024
- Represents
- Aetna, Inc.
Sutter Health Premium Overpayment Settlement
Sutter Health allegedly included unfair terms in its contracts with insurance plans, causing the plans to overpay for hospital services. These overpayments resulted in higher premiums for individuals and businesses. Sutter Health denies any wrongdoing; the parties agreed to settle to avoid further litigation.
- Settlement fund
- $228.5M
- Claim deadline
- September 12, 2025
- Represents
- Aetna Life Insurance Company, Aetna Health of California, Inc.
“Recovery” and “exposure” refer to total disclosed settlement funds in associated cases, not money personally won or lost by an attorney. Settlements generally resolve disputed allegations without a finding that either side won. Data comes from public court dockets and may be incomplete.