One in three Americans with private health insurance has been hit with a surprise medical bill, according to a new survey by Consumers Union. The study of 2,200 individuals also found consumers overall are confused when it comes to how to fight a surprise bill. Among the surprises: bills that were for higher amounts than customer’s expected, bills for out-of-network services that customers believed were in-network, and bills from doctors they did not expect would send them a bill. Betsy Imholz of Consumers Union says few people who receive surprise bills ever file a complaint with a state agency. “Nobody...