Final answer:
The term 'complaint' best describes an issue brought to a healthcare provider concerning patient abuse or neglect, as it is a formal statement of dissatisfaction or alleged mistreatment.
Step-by-step explanation:
When an issue concerning patient abuse or neglect is brought to the attention of a healthcare provider, the most appropriate term to describe this situation is a complaint. A complaint is a formal statement expressing dissatisfaction or alleging mistreatment. This term is used in healthcare to initiate a review or investigation into the practices that may harm a patient. An accusation or a charge often implies a legal assertion that someone has committed a crime, and a grievance is a formal employment dispute, which although could involve allegations of abuse or neglect, is not as specifically targeted at patient care issues as a complaint is.