I spent 5 days in the hospital a few months ago with a blood clot in my lung. Afterwards i receive a summary from my insurance company which usually comes a week or two before i get any bills. It showed that there was roughly 24k in bills and none of it was covered so i call the insurance company. They told me i needed pre authorization and i told her it was a life threatening emergency and i almost died so she put me on hold and called the hospital. She came back a few minutes later saying yeah you're right, they just did the billing under the wrong code. She said it would 30-45 days before they redo it and i get any bills which was fine as i was in no hurry to get more medical bills. Yesterday i got the summary in the mail and now it's billed at 48k, the insurance paid just under 4k and i owe nothing. Not complaining that i owe nothing but I'm curious why i was billed 24k and then when the insurance company was billed it was pretty much doubled for the same treatment.