State efforts to manage the costs of care for high-expenditure Medicaid beneficiaries have had mixed results, and the most significant barriers to better care management are difficulties dealing with social determinants of health, shortages of providers in rural areas and an inability to contact some beneficiaries, the Government Accountability Office says in a new report. Based on a survey of Medicaid officials and managed-care plans in seven states, GAO found that states and plans employ a wide array of policies...