http://www.infinisource.net/Rss/HRA.ashx News and Review: Topic - Health Reimbursement Arrangements 10 Coordination of benefits is an important issue for the Medicare system. The general rule is that employer-provided coverage – when based on current employment – is primary coverage when an individual is also covered by Medicare. In the past, the Centers for Medicare and Medicaid Services (CMS) has tried a voluntary data sharing arrangement with major insurance carriers and plans to enforce the Medicare Secondary Payer (MSP) rules. ../Infinisource/Article.aspx?articleId=f7b0153d-d939-4f28-8dc1-6121b920fd9a Thursday, January 15, 2009