More than 16,000

... Medicaid beneficiaries (of the 5.4 million studied) potentially engaged in "doctor shopping" in 2011 to obtain prescriptions for antipsychotic and respiratory medications worth about $33 million, according to a recent U.S. Government Accountability Office review of Medicaid drug claims in four high-spending states, which concluded that increased reporting on lock-in programs may help strengthen CMS's efforts to monitor potentially wasteful or abusive practices.