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🔗 '''Coordination of benefits''' is a set of rules and procedures used in [[Definition:Health insurance | health insurance]] to determine the order in which multiple [[Definition:Insurance policy | insurance policies]] covering the same individual will pay [[Definition:Claim | claims]], preventing the insured from receiving reimbursements that exceed the actual cost of care. When a person is covered under two or more group or individual health plans — for instance, through their own employer and a spouse's employer plan — coordination of benefits (COB) provisions establish which plan pays first as the [[Definition:Primary insurance | primary]] payer and which responds second as the [[Definition:Secondary insurance | secondary]] payer. Without these provisions, [[Definition:Insurer | insurers]] would face routine [[Definition:Overpayment | overpayments]] and [[Definition:Moral hazard | moral hazard]] concerns.

📊 The mechanics follow a hierarchy of rules, typically governed by model regulations from the National Association of Insurance Commissioners ([[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]]). Common rules include: the plan covering the patient as an employee pays before the plan covering them as a dependent; for dependent children, the "birthday rule" dictates that the parent whose birthday falls earlier in the calendar year has the primary plan; and an active employee's plan pays before a retiree or COBRA continuation plan. Once the primary plan processes the claim and pays its portion, the secondary plan reviews the remaining balance and pays up to its own benefit limits — but total payments from both plans cannot exceed the actual charges incurred. [[Definition:Claims administration | Claims administrators]] and [[Definition:Third-party administrator (TPA) | third-party administrators]] handle COB determinations daily, and errors in this process are a common source of [[Definition:Claim denial | claim denials]] and member frustration.

💡 Effective coordination of benefits is essential to controlling [[Definition:Loss ratio (L/R) | loss ratios]] and maintaining the financial sustainability of group health plans. For employers, understanding COB rules helps in designing benefit programs that avoid unnecessary cost duplication. Increasingly, automated COB verification tools are integrated into [[Definition:Claims management system | claims management systems]], using electronic data interchange and cross-plan databases to identify other coverage in real time. As healthcare costs continue to escalate, the accuracy and efficiency of COB processes have taken on greater importance for [[Definition:Insurance carrier | carriers]], [[Definition:Self-insured plan | self-insured employers]], and the [[Definition:Insurtech | insurtech]] platforms seeking to modernize the claims experience.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Primary insurance]]
* [[Definition:Secondary insurance]]
* [[Definition:Subrogation]]
* [[Definition:Explanation of benefits (EOB)]]
* [[Definition:Other insurance clause]]
* [[Definition:Third-party administrator (TPA)]]
{{Div col end}}

Definition:Coordination of benefits - Revision history

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