The 'coordination of benefits' (COB) provision in group health insurance is designed to prevent:
Explanation
Coordination of benefits applies when a person is covered by more than one group plan; it establishes which plan pays first (primary) and which pays second (secondary) so that the total reimbursement does not exceed 100 percent of the actual covered expenses. It does not bar filing claims, block preventive care, or stop the insurer from paying. COB exists to prevent duplicate payment and the profit motive that could arise from being over-reimbursed by multiple plans.
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