Final answer:
An accidental death refers to an unexpected patient death that is not related to the patient's illness.
Step-by-step explanation:
An unexpected patient death that is not related to the patient's illness is termed an accidental death.
This term refers to a death that occurs due to an unforeseen event or mistake during healthcare procedures, treatments or interventions.
For example, if a patient falls and sustains a fatal injury while in the hospital, it would be considered an accidental death.