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 Birthday Rule

One method used by health insurance companies to determine which parent's health insurance coverage will be primary for a dependent child, when both parents have separate coverage. Typically, the health insurance plan of the parent whose birthday falls earliest in the year will be considered primary. For more information, see also, COB.

Insurance companies reserve the right to change the terms of a policy after properly notifying you. Please note that definitions of certain terms may vary across insurance companies.

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