Some people who expected their health insurance to cover some out-of-network care have been getting stuck with enormous bills. One Kansas City, Kansas, couple paid thousands of dollars out-of-pocket and up-front for care. They expected to get a partial reimbursement from their insurer. So, they were shocked when instead they got a bill saying they owed even more than what they’d already paid. It turns out, a little-known data firm called MultiPlan was working with their insurance company to suggest cuts to their coverage. MulitPlan says it’s helping control ballooning health care costs by keep…