The OIG estimates that CMS made $7.5 million in incorrect Medicare payments to hospitals in 2010 and 2011 for outpatient clinic visits, in part because of errors in identifying patients as "new" versus "established." According to the OIG, hospitals attributed the incorrect payments to clerical errors, staff not fully understanding Medicare billing requirements, reliance on codes selected by the physician, or billing systems that could not identify established patients. The OIG recommends that CMS work with the Medicare administrative contractors (MACs) to recover incorrect payments; provide additional guidance to hospitals on billing clinic visits for new or established patients; and instruct hospitals on the need for stronger compliance controls.

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