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ACA Effects on the Emergency Department

February 3, 2017

Short Attention Span Summary

Unintended Consequences
A search through the thousands of pages of the Affordable Care Act (ACA) bill PDF for the word “emergency” quickly reveals that the goal is to increase primary care services and decrease ED visits.  It hasn’t gone as planned, according to this analysis.  Medicaid patient ED visits increased 126%.  But uninsured visits decreased 47%.  Also travel time for visits truly needing emergency care decreased by 54 seconds in states with Medicaid expansion.

Spoon Feed
The ACA Medicaid expansion has had multiple effects: more ED visits, fewer uninsured patients in the ED, and perhaps more choices where to seek hospital care.


Ann Intern Med. 2016 Dec 20. doi: 10.7326/M16-0086. [Epub ahead of print]

Insurance Expansion and Hospital Emergency Department Access: Evidence From the Affordable Care Act.

Garthwaite C1, Gross T1, Notowidigdo M1, Graves JA1.

Author information:

1From Northwestern University, Evanston, Illinois; Columbia University Mailman School of Public Health, New York, New York; and Vanderbilt University School of Medicine, Nashville, Tennessee.



Little is known about whether insurance expansion affects the location and type of emergency department (ED) use. Understanding these changes can inform state-level decisions about the Medicaid expansion under the Patient Protection and Affordable Care Act (ACA).


To investigate the effect of the 2014 ACA Medicaid expansion on the location, insurance status, and type of ED visits.


Quasi-experimental observational study from 2012 to 2014.


126 investor-owned, hospital-based EDs.


Uninsured and Medicaid-insured adults aged 18 to 64 years.


ACA expansion of Medicaid in January 2014.


Number of ED visits overall, type of visit (for example, nondiscretionary or nonemergency), and average travel time to the ED. Interrupted time-series analyses comparing changes from the end of 2013 to end of 2014 for patients from Medicaid expansion versus nonexpansion states were done.


There were 1.06 million ED visits among patients from 17 Medicaid expansion states, and 7.87 million ED visits among patients from 19 nonexpansion states. The EDs treating patients from Medicaid expansion states saw an overall 47.1% decrease in uninsured visits (95% CI, -65.0% to -29.3%) and a 125.7% (CI, 89.2% to 162.6%) increase in Medicaid visits after 12 months of ACA expansion. Average travel time for nondiscretionary conditions requiring immediate medical care decreased by 0.9 minutes (-6.2% [CI, -8.9% to -3.5%]) among all Medicaid patients from expansion states. We found little evidence of similar changes among patients from nonexpansion states.


Results reflect shifts in ED care at investor-owned facilities, which limits generalizability to other hospital types.


Meaningful changes in insurance status and location and type of ED visits in the first year of ACA Medicaid expansion were found, suggesting that expansion provides patients with a greater choice of hospital facilities.

Primary Funding Source:

Robert Wood Johnson Foundation.

PMID: 27992930 [PubMed – as supplied by publisher]

What are your thoughts?