Medical malpractice can occur in any phase of medical practice. It may involve a delay or failure to diagnose a disease. There could be a mistake made by a surgeon during an operation resulting in a serious injury or death. Emergency room physicians or their staff may fail to correctly diagnose a disease or medical condition. Sometimes nurses or pharmacists give a patient the wrong medicine or an incorrect dosage of a medicine. Even if a physician correctly diagnoses a disease, he may have committed malpractice by failing to treat the disease promptly.