How to keep people out of the emergency room

Help for immigrants in arranging primary care visits leads to substantial drop in ER visits and costs, a new study shows.

Encouraging immigrants to visit primary care doctors creates a striking decline in costly emergency room use, according to a new study co-

The paper, " Reducing Frictions in Health Care Access: The ActionHealthNYC Experiment for Undocumented Immigrants ," appears in the September issue of the journal American Economic Review: Insights. The co-authors are Adrienne Sabety, an assistant professor in the Department of Health Policy at Stanford University; Gruber, who is the Ford Professor of Economics and head of the Department of Economics at MIT; Jin Yung Bae, a visiting associate professor at New York University’s Global School of Public Health; and Rishi Sood, executive director of health care access and policy in the New York City Department of Health and Mental Hygiene.

States and local jurisdictions in the U.S. have a variety of policy approaches regarding undocumented immigrants. A New York City government task force launched in 2014 recommended finding new ways to extend health care access for such residents. To conduct this study, the researchers worked with officials from the New York City Mayor’s Office and the Department of Health and Mental Hygiene to design a pilot program drawing on the city’s estimated population of 1.1 million undocumented immigrants.

The experiment had more than 2,400 participants, with 1,286 in a treatment group receiving help setting up a primary care appointment. Another 1,142 participants served as a control group, and did not receive the same help. Everyone in the program had a household income no greater than twice the federal poverty line. The program reached people by partnering with community-based groups, using mailings and social media, and buying television and print media ads.

The effect of the program was rapid. In its first three months, 57 percent of people in the treatment group visited a primary care physician, while just 16 percent of people in the control group did the same. Those in the treatment group saw a savings of just over $195 in emergency-visit costs (when not admitted), which rose to over $477 for the higher-risk patients. Federal law requires emergency departments to not turn away patients.

Overall, there was a 33.8 percentage point increase in diabetes screenings and a 45.4 percentage point increase in blood pressure screenings for those in the treatment group - which, other research shows, leads to a 12 percent mortality reduction. The researchers used hospital data and surveys to measure these outcomes.

The program did this without extending health insurance to anyone. Most visits had a $15 co-pay; many of New York City’s public health institutions scale costs to the patient’s ability to pay. The aim of the program was to see what difference it would make, insurance aside, to help nudge people to see a doctor in the first place.

"I thought there was a decent chance this program wouldn’t have much of an impact," Gruber says. "The fact we could find such a big effect... was surprising to me and I think it illustrates the nonfinancial barriers people are facing to get the care they need, and the role of management [in that]."

Because New York City has an extensive public health network, the researchers note in the paper, the same type of program might not be possible in some other places. And the aggregate health of participants in any such future program might be different, meaning the size of the drop in emergency care use might vary.

Separately, as the authors note in the paper, extending formal health insurance to undocumented immigrants "remains politically untenable" for the most part. On the other hand, jurisdictions might examine if other approaches increase care while, in this case, lowering emergency room traffic.

"There’s this tendency with health care to think that if you give people health insurance, you’re done," Gruber says. "This study is saying the right system combines insurance as financial protection with other kinds of [tools]." He adds: "There is just huge potential to use data and science to get people to where they need to be in terms of getting the most efficient care."

The institutional review boards in New York City’s Department of Health and Mental Hygiene and the National Bureau of Economic Research approved the research protocol. The trial was publicly archived at The pilot program was supported by the Robin Hood Foundation, the Rockefeller Foundation, and the Altman Foundation. Sabety received research funding from the National Science Foundation.

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