What is a lien, and who can file one on me?

A lien is something that anyone who has outstanding medical bills, or who has paid medical bills, can assert against a recovery that you may receive. 

The lien allows them to make a claim to being owed a portion of your recovery to pay back medical bills or medical payments that were made on your behalf.  These liens can be significant if you required a lot of medical treatment.  It is always critical to let your attorney know if anyone asserts a lien against you, so that they can attempt to minimize the amount you will have to pay back to those who have a lien against your recovery.