Provision regulating payments to eliminate duplicate coverage when a claimant is covered by multiple group plans. The procedures set forth in a Subscription Agreement to determine which coverage is primary for payment of benefits to Members with duplicate coverage. Used by insurers to avoid duplicate payment for losses insured under more than one insurance policy. A coordination of benefits, or “nonduplication,” clause in either policy prevents double payment by making one insurer the primary payer, and assuring that not more than 100 percent of the cost is covered. Standard rules determine which of two or more plans, each having COB provisions, pays its benefits in full and which becomes the supplementary payer on a claim.