The most common type of workplace violence in healthcare settings is

Answer;
Worker-on-worker violence
The most common type of workplace violence in healthcare settings is worker-on- worker violence.

Explanation;
Workplace violence is any physical assault, threatening behavior or verbal abuse occurring in the work setting.
Worker-on-worker violence is often directed at persons viewed as being "lower on the food chain" such as in a supervisor to supervisee or doctor to nurse though incidence of peer to peer violence is also common.