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working paper, published in October by the National Bureau of Economic Research, analyzed roughly 1.1 million visits to 44 ERs throughout the Veterans Health Administration, where nurse practitioners can treat patients without oversight from doctors.
Researchers found that treatment by a nurse practitioner resulted on average in a 7% increase in cost of care and an 11% increase in length of stay, extending patients’ time in the ER by minutes for minor visits and hours for longer ones. These gaps widened among patients with more severe diagnoses, the study said, but could be somewhat mitigated by nurse practitioners with more experience.
The study also found that ER patients treated by a nurse practitioner were 20% more likely to be readmitted to the hospital for a preventable reason within 30 days, although the overall risk of readmission remained very small.