Medicare is the “secondary” payer of health benefits for Medicare beneficiaries when another entity is the “primary” payer. Under new MSP enforcement rules, all entities that are considered primary payers and meet the definition of a responsible reporting entity (RRE) must register with CMS and comply with certain reporting requirements. Such RREs include (1) group health plans, and (2) non-group health plan (NGHP) arrangements, such as carriers of liability insurance (including self-insurance), no-fault insurance, and workers’ compensation. CMS recently announced it is extending its reporting requirement for NGHPs until January 1, 2011. CMS also has posted three new alerts on NGHP RRE Compliance, NGHP Alert Risk Management and NGHP RREs Who Must Report.