What rule was established to determine which carrier is the primary carrier when both parents have insurance to cover a child?

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The birthday rule was established to explain which insurance carrier is the primary carrier when both parents have insurance to cover a child.The rule stipulates that the parent whose birthday falls earlier in the calendar year is billed first.
COB is "coordination of benefits," stating that the patient will receive payment from both carriers but the total received may not be more than 100% of the actual dental expense.
CDT stands for Current Dental Terminology and is used for coding dental procedures.
The secondary carrier is the insurance company that pays at least a portion of the bill after the primary carrier has paid.

What Rule Was Established to Determine Which Carrier Is the Primary