The judge denied the motion for class certification in its entirety in this case involving claims that a service provider reordered physician diagnosis codes. A large provider of healthcare services retained Professor Laurence Baker of Stanford University and Cornerstone Research to respond to a motion to certify a class of patients. The plaintiffs alleged that a large healthcare provider reordered physician diagnosis codes when submitting claims for insurance payment, resulting in patient cost sharing for services that should have been provided at no cost to patients. Professor Baker submitted a declaration for the defendant, showing that it was not possible to ascertain which patients were in the proposed class based on the definitions provided by the plaintiffs. He also demonstrated tha

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