I was sent to collections for a rabies vaccine (well the immunoglobulin post-exposure part was the real expensive one) that was supposed to be reimbursed under a pharma/CDC program. Something like $17k.

I begged the guy that helped me fill out the paperwork for that program to give me something proving the hospital was paid. He broke the law and gave me the whole month's reimbursed list of everyone in that program. Hospital made the situation go away in less than a day once they saw I had it.

I will never forget his name since he put his ass on the line doing that and I never met him in person, just a few phone calls.