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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.
This is the official answer form Facebook management. Note: We have limits in a place around the number of times you can edit your birthday. If you recently edited your birthday, you may have to wait a few days before changing it again.