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The birthday rule is a common claims practice health insurance companies use when children are listed as dependents on two parents' group health plans. The rule helps determine which health plan is the primary policy and which is secondary so that total coverage does not exceed 100 percent of charges.
2. In rare cases, the term Birthday Rule has also been used to satirically justify everyday asshole-ish behavior. This is not quite like the first use of Birthday Rule because the asshole-ish behavior occurred when it wasn't the guy's/girl's birthday.