The Government Accountability Office (GAO) has issued a report entitled "Medicare: Covert Testing Exposes Weaknesses in the Durable Medical Equipment Supplier Screening Process." The GAO set up two fictitious durable medical equipment (DME) companies using undercover names and bank accounts, and the fictitious companies eventually were approved for Medicare billing privileges despite having no clients and no inventory. CMS acknowledged that the covert tests illustrate gaps in oversight that still require improvement, and agency reiterated its intention to strengthen the entire supplier enrollment process.