In contrast, a randomized, controlled study by Finkelstein, et al. in involving 24,646 lottery-selected uninsured individuals in Oregon who were granted Medicaid coverage in 2008 showed that they increased their ED visits by 40 percent in the first 15 months after receiving coverage. Many observers speculated that the rise in ED use was due to pent-up demand and would therefore dissipate over time as the newly insured found and used other sites of care or as their health needs were met and their health improved. However, the researchers were unable to find any evidence that the increase in ED use due to Medicaid coverage is driven by pent-up demand that decreases over time; in fact, they found that the effect on ED use appears to persist over the first two years of coverage.
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