Access to Care and Chronic Disease Outcomes Among Medicaid-Insured Persons Versus the Uninsured

Objectives. We sought to determine the association between Medicaid coverage and the receipt of appropriate clinical care.Methods. Using the 1999 to 2012 National Health and Nutritional Examination Surveys, we identified adults aged 18 to 64 years with incomes below the federal poverty level, and compared outpatient visit frequency, awareness, and control of chronic diseases between the uninsured (n = 2975) and those who had Medicaid (n = 1485).Results. Respondents with Medicaid were more likely than the uninsured to have at least 1 outpatient physician visit annually, after we controlled for patient characteristics (odds ratio OR] = 5.0; 95% confidence interval CI] = 3.8, 6.6). Among poor persons with evidence of hypertension, Medicaid coverage was associated with greater awareness (OR = 1.83; 95% CI = 1.26, 2.66) and control (OR = 1.69; 95% CI = 1.32, 2.27) of their condition. Medicaid coverage was also associated with awareness of being overweight (OR = 1.30; 95% CI = 1.02, 1.67), but not with awareness or control of diabetes or hypercholesterolemia.Conclusions. Among poor adults nationally, Medicaid coverage appears to facilitate outpatient physician care and to improve blood pressure control.Lack of health insurance is associated with lower rates of preventive care, delays in necessary care, forgone care, medical bankruptcy, and increased mortality.1–5 The Affordable Care Act (ACA; Pub L No. 111–148) expanded Medicaid insurance for people with low incomes (< 138% of the federal poverty level FPL]) in 31 states. However, whether Medicaid coverage improves health outcomes remains controversial. Several studies described differences in chronic disease prevalence and control between uninsured persons and those with Medicaid, but have not been designed or powered to explore whether Medicaid coverage might cause these differences.6–8Some have suggested that Medicaid’s low reimbursement rates discourage physician acceptance of Medicaid patients, limiting access to care and resulting in poor health outcomes.9,10 Recently, the Oregon Health Insurance Experiment (OHIE), a randomized, controlled trial, found that Medicaid coverage increased health care use, improved patients’ financial security and self-reported health, lowered depression rates, and raised diabetes diagnosis rates.11–13 However, the OHIE did not find improvements in other important health outcomes such as control of other chronic diseases, fueling Medicaid’s critics.14,15The rigorous design of the OHIE provides strong evidence on the impact of Medicaid in the Portland, Oregon, metropolitan area where it was conducted. However, Portland’s relatively robust medical safety net for the uninsured16,17 may have attenuated the potential for health improvements from Medicaid expansion compared with other locales, or the United States as a whole.We used the nationally representative National Health and Nutrition Examination Survey (NHANES) to compare outpatient physician visit frequency among the uninsured and comparable persons with Medicaid coverage. We also assessed whether individuals with major chronic conditions had been previously diagnosed with the condition, and whether it was under control.