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© 2017 Project HOPE- The People-to-People Health Foundation, Inc. Oregon's 2008 Medicaid expansion significantly increased the use of prescription medications in 2009-10., National Institute on Aging (Grants P30AG012810, RC2AGO36631, and R01AG0345151)

© 2017 Project HOPE- The People-to-People Health Foundation, Inc. Oregon's 2008 Medicaid expansion significantly increased the use of prescription medications in 2009-10.

Context Expanding Medicaid to previously uninsured adults has been shown to increase detection and reduce the prevalence of depression, but the ways that Medicaid affects mental health care, how effectively it addresses unmet needs, and how those effects differ for those with and without a history of depression remain unclear. Methods We take advantage of Oregon's Medicaid lottery to gauge the causal effects of Medicaid coverage using a randomized‐controlled design, drawing on both primary and administrative data sources. Findings Medicaid coverage reduced the prevalence of undiagnosed depression by almost 50% and untreated depression by more than 60%. It increased use of medications frequently prescribed to treat depression and related mental health conditions and reduced the share of respondents reporting unmet mental health care needs by almost 40%. The share of respondents screening positive for depression dropped by 9.2 percentage points overall, and by 13.1 for those with preexisting depression diagnoses, with greatest relief in symptoms seen primarily in feeling down or hopeless, feeling tired, and trouble sleeping—consistent with the increase observed not just in medications targeting depression but also in those targeting sleep. Conclusions Medicaid coverage had significant effects on the diagnosis, treatment, and outcomes of a population with substantial unmet mental health needs. Coverage increased access to care, reduced the prevalence of untreated and undiagnosed depression, and substantially improved the symptoms of depression. There are likely to be substantial mental health consequences of policy decisions about Medicaid coverage for vulnerable populations. Keywords: Medicaid; insurance; depression; mental health, National Institute on Aging (Grant P30AG012810), National Institute on Aging (Grant RC2AGO36631), National Institute on Aging (Grant R01AG0345151), National Bureau of Economic Research (Grant 5 RRC 08098400‐03‐00)

The effect of Medicaid coverage on health and the use of health care services is of first-order policy importance, particularly as policymakers consider expansions of public health insurance. Estimating the effects of expanding Medicaid is challenging, however, because Medicaid enrollees and the uninsured differ in many ways that may also affect outcomes of interest. Oregon’s 2008 expansion of Medicaid through random-lottery selection of potential enrollees from a waiting list offers the opportunity to assess Medicaid’s effects with a randomized evaluation that is not contaminated by such confounding factors. In a previous examination of the Oregon Health Insurance Experiment, we found that Medicaid coverage increased health care use across a range of settings, improved financial security, and reduced rates of depression among enrollees, but it produced no detectable changes in several measures of physical health, employment rates, or earnings.

In 2008, Oregon initiated a limited expansion of a Medicaid program for uninsured, low-income adults, drawing names from a waiting list by lottery. This lottery created a rare opportunity to study the effects of Medicaid coverage by using a randomized controlled design. By using the randomization provided by the lottery and emergency-department records from Portland-area hospitals, we studied the emergency department use of about 25,000 lottery participants over about 18 months after the lottery. We found that Medicaid coverage significantly increases overall emergency use by 0.41 visits per person, or 40% relative to an average of 1.02 visits per person in the control group. We found increases in emergency-department visits across a broad range of types of visits, conditions, and subgroups, including increases in visits for conditions that may be most readily treatable in primary care settings., United States. Dept. of Health and Human Services (Assistant Secretary for Planning and Evaluation), California HealthCare Foundation, John D. and Catherine T. MacArthur Foundation, National Institute on Aging (Grant P30AG012810), National Institute on Aging (Grant RC2AG036631), National Institute on Aging (Grant R01AG0345151), Robert Wood Johnson Foundation, Alfred P. Sloan Foundation, Smith Richardson Foundation

Background: Despite the imminent expansion of Medicaid coverage for low-income adults, the effects of expanding coverage are unclear. The 2008 Medicaid expansion in Oregon based on lottery drawings from a waiting list provided an opportunity to evaluate these effects. Methods: Approximately 2 years after the lottery, we obtained data from 6387 adults who were randomly selected to be able to apply for Medicaid coverage and 5842 adults who were not selected. Measures included blood-pressure, cholesterol, and glycated hemoglobin levels; screening for depression; medication inventories; and self-reported diagnoses, health status, health care utilization, and out-of-pocket spending for such services. We used the random assignment in the lottery to calculate the effect of Medicaid coverage. Results: We found no significant effect of Medicaid coverage on the prevalence or diagnosis of hypertension or high cholesterol levels or on the use of medication for these conditions. Medicaid coverage significantly increased the probability of a diagnosis of diabetes and the use of diabetes medication, but we observed no significant effect on average glycated hemoglobin levels or on the percentage of participants with levels of 6.5% or higher. Medicaid coverage decreased the probability of a positive screening for depression (−9.15 percentage points; 95% confidence interval, −16.70 to −1.60; P=0.02), increased the use of many preventive services, and nearly eliminated catastrophic out-of-pocket medical expenditures. Conclusions: This randomized, controlled study showed that Medicaid coverage generated no significant improvements in measured physical health outcomes in the first 2 years, but it did increase use of health care services, raise rates of diabetes detection and management, lower rates of depression, and reduce financial strain., United States. Dept. of Health and Human Services. Office of the Assistant Secretary for Planning and Evaluation, California HealthCare Foundation, National Institute on Aging (P30AG012810), National Institute on Aging (RC2AGO36631), National Institute on Aging (R01AG0345151), John D. and Catherine T. MacArthur Foundation, Robert Wood Johnson Foundation, Alfred P. Sloan Foundation, Smith Richardson Foundation, United States. Social Security Administration (5 RRC 08098400-03-00, to the National Bureau of Economic Research as part of the Retirement Research Consortium of the Social Security Administration), Centers for Medicare & Medicaid Services (U.S.)

The recently enacted Patient Protection and Affordable Care Act includes a major expansion of Medicaid to low-income adults in 2014. This paper describes the Oregon Health Study, a randomized controlled trial that will be able to shed some light on the likely effects of such expansions. In 2008, Oregon randomly drew names from a waiting list for its previously closed public insurance program. Our analysis of enrollment into this program found that people who signed up for the waiting list and enrolled in the Oregon Medicaid program were likely to have worse health than those who did not. However, actual enrollment was fairly low, partly because many applicants did not meet eligibility standards., United States. Dept. of Health and Human Services. Office of the Assistant Secretary for Planning and Evaluation, California HealthCare Foundation, John D. and Catherine T. MacArthur Foundation, National Institute on Aging, Robert Wood Johnson Foundation, Alfred P. Sloan Foundation, United States. Social Security Administration

In 2008, a group of uninsured low-income adults in Oregon was selected by lottery to be given the chance to apply for Medicaid. This lottery provides an opportunity to gauge the effects of expanding access to public health insurance on the health care use, financial strain, and health of low-income adults using a randomized controlled design. In the year after random assignment, the treatment group selected by the lottery was about 25 percentage points more likely to have insurance than the control group that was not selected. We find that in this first year, the treatment group had substantively and statistically significantly higher health care utilization (including primary and preventive care as well as hospitalizations), lower out-of-pocket medical expenditures and medical debt (including fewer bills sent to collection), and better self-reported physical and mental health than the control group., National Institutes of Health. Department of Health and Human Services, California HealthCare Foundation, John D. and Catherine T. MacArthur Foundation, National Institute on Aging (P30AG012810), National Institute on Aging (RC2AGO36631), National Institute on Aging (R01AG0345151), Robert Wood Johnson Foundation, Alfred P. Sloan Foundation, Smith Richardson Foundation, United States. Social Security Administration (grant 5 RRC 08098400-03-00 to the National Bureau of Economic Research as part of the SSA Retirement Research Consortium), Centers for Medicare & Medicaid Services (U.S.)