Malpractice is improper, illegal, or negligent professional activity or treatment, especially by a medical practitioner, lawyer, or public official. When a doctor fails to correctly do a procedure, it can lead to physical and mental trauma for a patient. For this reason, all doctors are required to carry malpractice insurance while practicing medicine. When intending to file a lawsuit, one can sue both the doctor as an individual and the company the doctor works for. Since the doctor works for a company, it is also the duty of that company to ensure that all patients receive proper care; this also makes the company negligent.