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Study: Unnecessary ER visits aren't that common

David Goldman / AP

A new study from researchers at the University of California at San Francisco has found that only a tiny fraction (3.3%) of emergency room visits are considered "avoidable" — meaning people went home and didn't need any procedures, tests or medications. The results were based on seven years of federal ER visit data.

Why it matters: Some states and health insurers are charging people higher out-of-pocket costs or refusing to pay claims if they determine after the fact that an ER visit was unnecessary. The goal is to save money and route people to lower-cost settings like urgent care centers. But the study suggests that most ER visits are valid, and that retrospectively penalizing patients could complicate the issue.