Suing the University of Chicago Medical Center for allegedly violating the False Claims Act by failing to reimburse the government for Medicare payments involving “bad debts,” three qui tam plaintiffs relied on a series of inferences — starting with the results of UCMC’s audit of a wayward billing contractor — to satisfy Federal Rule of Civil Procedure 9(b)’s enhanced requirements for pleading fraud.When Medicare beneficiaries fail to pay deductibles or coinsurance and these obligations …