Is it possible to sue my lawyer after the case was closed 2 months ago?

My case was settled for a small amount and my lawyer informed me that all of my bills were taken care of. I just revieved a call from my chiropractor stating that I have an outstanding balance. They try to get into contact with him and now he is dodgeing their phone calls. In addition the chiropractor didnt get paid from the settlement. What options do I have?