Malpractice

Evil practice; illegal or immoral conduct; practice contrary to established rules; specifically, the treatment of a case by a surgeon or physician in a manner which is contrary to accepted rules and productive of unfavorable results.

a wrongful act that the actor had no right to do; improper professional conduct; "he charged them with electoral malpractices"

professional wrongdoing that results in injury or damage; "the widow sued her surgeon for malpractice"