ROCHESTER — Mayo Clinic and other large health systems are again suing Blue Cross Blue Shield (BCBS), which provides health insurance for more than 115 million Americans, for alleged illegal antitrust actions that result in underpayment to hospitals.

Mayo Clinic — along with fellow Minnesota nonprofit care providers Allina Health System, CentraCare Health System and Fairview Health System, plus Atlantic Health System, RWJBarnabas Health, University of Florida Health and the University of Chicago Medical Center — filed a new lawsuit against BCBS on Aug. 4 in the Northern District of California.

The lawsuit argues that BCBS entities, including those in Minnesota and North Dakota, should compete with each other and should individually negotiate contracts with care providers. Instead, the

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