Stephen S. Hasegawa

Mr. Hasegawa’s work was recognized by the National Law Journal with the “Elite Trial Lawyers” award to the firm. His whistleblower cases have returned millions to schools and helped stop fraud schemes involving Medicare and a disabled vets program.

Stephen Hasegawa, a partner at Phillips & Cohen, represents whistleblowers in qui tam cases and whistleblower submissions involving numerous industries, such as healthcare, defense, aerospace, financial services and government procurement.

He has played a key role in a number of whistleblower cases that have gotten significant results, including:

Mr. Hasegawa is co-counsel in a case against UnitedHealth Group and other defendants alleging use of fraudulent risk-adjustment data in Medicare Advantage plans. It is one of the first significant whistleblower cases alleging risk adjustment fraud by a Medicare Advantage plan run by a major health insurer.

Mr. Hasegawa joined Phillips & Cohen after eight years with Irell & Manella LLP in Los Angeles. He litigated numerous securities matters, including matters involving private securities litigation, SEC actions and inquiries, criminal investigations, internal investigation and state securities laws. Mr. Hasegawa’s practice also covered a diverse range of commercial disputes, including litigation under the California False Claims Act, entertainment-industry litigation, class actions and numerous cases concerning copyright, trademark, trade secrets and contracts.

Mr. Hasegawa graduated with honors from the University of Chicago Law School, where he was Articles Editor of the University of Chicago Legal Forum. He was named a “Super Lawyers Rising Star” in both Northern and Southern California.

Mr. Hasegawa serves as Phillips & Cohen LLP’s General Counsel. He is admitted to the bar in California.

“We're a small firm that is very successful handling big cases, so we're used to dealing with giant, well-funded defense firms . . .
  • “Gilead Whistleblowers may be well placed to fight DOJ dismissal,” Bloomberg Law, January 16, 2019.
  • “Credit Suisse: AbbVie’s fraud allegations mirror common biopharma strategy,” S&P Global Market Intelligence, September 19, 2018.
  • “High hopes, 1 result from Justice Department false claims memo,” Bloomberg Government, July 17, 2018.
  • Wells Fargo Will Appeal $5.4M OSHA Whistleblower Award, Corporate Counsel, April 4, 2017.
  • Interview with “Elite Trial Lawyer” and Phillips & Cohen partner Stephen Hasegawa, National Law Journal.
  • “Office Depot settles whistleblower suit for $68.5 million,” San Bernadino County Sun, January 16, 2015.
  • “Office Depot to Pay $68.5 Million to Settle False Claims Charge,” Corporate Crime Reporter, January 14, 2015.
  • “Santa Clara County to get $3 million in settlement with Office Depot in overcharges for office supplies,” San Jose Mercury News, January 16, 2015.
  • “Community Health Systems, hospitals to pay $75M in Medicaid scam,” The Tennessean, February 2, 2015.
  • “CHS settles false claims allegations for $75M,” Beckers Hospital Review,  February 2, 2015.
  • “U.S. Renal Care settles billing fraud case brought by nurse,” Nephrology News.
  • “U.S. Renal Care Will Pay $7.3 Million to Settle False Claims Charge,” Corporate Crime Reporter, May 21, 2013.
  • National Law Journal – Elite Trial Lawyers (firm award) – 2015
  • Consumer Attorneys Of California – Consumer Attorney of the Year Finalist (firm award) – 2015
  • National Law Journal – Rising Stars

VIDEO: Mr. Hasegawa was filmed by CAOC about his case against Office Depot.

  • Moderator of “Developing Issues Involving the Anti-Kickback Statute and Stark Law,” 19th Annual Taxpayers Against Fraud Education Fund Conference, October 2, 2019.
  • “The DOJ’s evolving civil enforcement priorities: from the Yates memo to the Brand memo and beyond,” George Mason University Law & Economics Center Panel, February 22, 2019.
  • “Compliance: New Risks, Challenges, and Approaches,” New York University, October, 2016
  • “When/How to Attack Affirmative Defenses,” Taxpayers Against Fraud Education Fund Conference, 2015.

Phillips & Cohen attorney Stephen Hasegawa – a partner at our San Francisco office – underscores the unique value of whistleblowers at George Mason Law & Economics Center’s recent panel on False Claims Act enforcement.  See video of the panel discussion.

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