CMS has announced that it is delaying a provision of its 2015 Medicare Advantage/Medicare Part D final rule, published on May 23, 2014, that requires physicians and other eligible professionals who prescribe Part D drugs to be enrolled in Medicare (or have a valid opt-out affidavit on file) for their prescriptions to be covered under Medicare Part D. While the final rule stated that the effective date for this requirement would be June 1, 2015, CMS has announced that it is delaying enforcement of this provision until December 1, 2015. CMS notes that Part D drug prescribers must submit their Medicare enrollment applications or opt-out affidavits to their Medicare Administrative Contractors by June 1, 2015 to provide sufficient processing time and prevent prescription drug claims from being denied beginning December 1, 2015.