By: Sarah Kliff

On October 19, 2016, Jessica Pell fainted and hit her head on a nearby table, cutting her ear. She went to the emergency room at Hoboken University Medical Center, where she was given an ice pack. She received no other treatment. She never received any diagnosis. But a bill arrived in the mail for $5,751.

"It's for the ice pack and the bandage," Pell said of the fee. "That is the only tangible thing they could bill me for."

Pell's experience is not unique. Submissions to Vox's ER database project found multiple examples of ERs charging patients hundreds or even thousands of dollars for walking through the door. Some never got past the waiting room. Some were triaged, but none received treatment from a doctor.