Medicare Compliance Review of Abbott Northwestern Hospital for 2013 and 2014 

Abbott Northwestern Hospital (the Hospital) complied with Medicare billing requirements for 88 of the 162 inpatient and outpatient claims we reviewed. However, the Hospital did not fully comply with Medicare billing requirements for the remaining 74 claims, resulting in overpayments of $934,000 for 2013 and 2014 (audit period). On the basis of our sample results, we estimated that the Hospital received overpayments of at least $8 million for the audit period. Overpayments occurred primarily because the Hospital did not have adequate controls to prevent the incorrect billing of Medicare claims within the selected risk areas that contained errors.