A tiny federal agency tasked with protecting the public from injuries caused by lawn mowers and coffeemakers is demanding that some of the nation’s biggest health systems turn over detailed, personally identifiable medical records of all patients who seek help at their emergency rooms.

A tiny federal agency is trying to force hospitals to hand over emergency room records—including all personal identifying information.

The tiny federal agency that tracks consumer product safety is pressuring hospitals to turn over patient records from emergency room visits, including about injuries that have…