This notice announces a CMS Ruling that establishes a policy that revises the current policy on Part B billing following the denial of a Part A inpatient hospital claim by a Medicare review contractor on the basis that the inpatient admission was determined not reasonable and necessary. This revised policy is intended as an interim measure until CMS can finalize a policy to address the issues raised by the Administrative Law Judge and Medicare Appeals Council decisions going forward. To that end, elsewhere in this issue of the Federal Register, we published a proposed rule entitled, "Medicare Program; Part B Inpatient Billing in Hospitals,'' to propose a permanent policy that would apply on a prospective basis.