How often should a healthcare facility that is joint commission accredited plan to test the emergency preparedness plan?

In the United States, the joint commission is the one that regulates that hospitals have an emergency preparedness plan that is evaluated through drills or actual participation in a real event as a mininum two times per year.

One of the drills or events must include community-wide resources and an influx of actual or simulated patients to assess the ability of colaborative efforts and command structures.

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