We recommend that the Centers for Medicare & Medicaid Services work with the DME MACs to do the following, which if in effect during our audit period could have saved Medicare as much as $30,051,107 for wheelchair repairs: strengthen Medicare requirements to ensure that DME MACs review accumulated costs of repairs made to wheelchairs (including wheelchairs purchased on a lump-sum basis) during their 5-year RUL that exceed a certain cost limit and use this cost limit as a basis for determining when wheelchairs furnished by suppliers will not remain serviceable for their entire 5-year RUL.