A new Kaiser Family Foundation brief finds that, among people with employer-based coverage, almost one in five patients admitted to the hospital end up getting a bill from an out-of-network provider.

Why it matters: Patients have to pay more out of their own pockets for out-of-network care.

As a lot of excellent recent reporting on emergency room billing has shown, it can be almost impossible to avoid out-of-network bills even when you take pains to ensure you’re going to an in-network hospital.