Sen. Chuck Grassley of Iowa and Sen. Sherrod Brown of Ohio are urging the federal Centers for Medicare and Medicaid Services (CMS) to maintain current policy requiring that Medicare prescription drug plans carry six categories of prescription drugs offered to participating beneficiaries. Grassley and Brown are the sponsors of legislation requiring the maintenance of the “six protected classes.”  The agency earlier tried to limit the categories by regulation, then dropped its plans after public outcry.  Grassley and Brown are concerned that CMS might try again.