Final answer:
A client with a hip fracture due to a mass disaster is typically classified as ESI level 2, which requires prompt attention but is not immediately life-threatening.
Step-by-step explanation:
The Emergency Severity Index (ESI) is a tool used by emergency department personnel to classify patients by the severity of their conditions and the resources they need. In the case of a client with a hip fracture due to a mass disaster, this would typically be categorized as ESI level 2. This level indicates a high risk situation where the client would require prompt attention, as they are likely to be in severe pain and might need significant resources such as imaging and orthopedic consultation, but their situation is not immediately life-threatening like a level 1 classification.