I just got a bill from my Chiropractor from 5 years ago. Do I have to legally pay for this? 
Having been in a similar situation I would say `` no '' . Why ? Your chiropractor knows there is a limited amount of time to file with an insurance company for payment . Usually about a year . After that , the insurance company is not obligated to pay the claim . Pretty much neither are you . Why ? you did n't hire his/her accounts receivable clerk . Your chiropractor has a professional responsibility to handle the billing end of their practice along with the treatment end . 5 years late is beyond `` reasonable '' to bill . They screwed up and probably with more than just you . This is sort of a fishing trip to see who bites on their office 's lack of follow through . It is basically stating `` I ca n't run my business professionally , please cover for my mistakes . '' I would n't ignore them , I would talk to them about it and state why I did n't feel the need to pay . 