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How to determine your primary health insurance as a dependent on both plans
Determine whether the rule covers your situation.
The " birthday rule " is used to determine which health insurance plan is primary if you are a dependent on both plans, but it only applies to children.
If you are a minor, you can use the birthday rule to determine your primary health insurance plan.
The rule also may apply if you are over the age of 18, but you're a college student and still considered a dependent of your parents. Find out the birthdays of your parents.