birthday rule

A method of determining which parent's medical coverage will be primary for dependent children

birth·day rule

(bĭrth'dā rūl)
A principle involving coordination of benefits of health insurance plans to determine which insurance plan should cover costs of health care for dependent children; states that the insurance of the parent whose birth month is first in the calendar year is primary. (If both are in the same month, then coverage derives from the plan carried by the parent born earlier in the month. If both are the same month and day, coverage comes from the parent who has been covered for a longer period.)
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9 The contractor understands and agrees that the Universitys plan contains a birthday rule and group-to-group coordination of benefits provision.
So removing the 75th birthday rule should give us more control over our pensions and leave us all less exposed to the vagaries of annuity rates.