How many days does a hospital have to file a notice of a lien and give it to a person's attorney?

I am an intern for civil litigation lawyer. However, I have to do the research and I need to know how many days a hospital has to give the notice of lien to the attorney. THe only thing that has anything about dates in the Nevada Revised Statutes (NRS) is saying that a company has 90 days to give a notice to the representative, but that is for property liens. I really need help and would really appreciate the information as fast as possible. :)