Employers sue UnitedHealth, alleging overpayment of workers' medical claims

Six major U.S. companies have filed a lawsuit against UnitedHealth Group, claiming the insurer overpaid medical claims for their employees, which they say increased their costs.

The plaintiffs include Aramark, Whirlpool, Grainger, Kraft Heinz Foods, Ralph Lauren and Sterling Jewelers. They allege that UnitedHealth's payment practices have led to higher expenses for the employers.

The lawsuit seeks to address these alleged overpayments, though details of the legal remedy sought were not disclosed in the filing.

UnitedHealth has not commented publicly on the allegations at this time.