The minor child of the Biological father is covered in Michigan under his step dads health Insurance now if?

he comes down to vacation with his biological father in Florida he is still covered, the father would just need a copy of the health insurance card Correct ?
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It shouldn't matter to what state the minor child travels to. He will still be covered by the health insurance. Yes, the father should have a copy of the insurance card, but even without it he would be covered. It would just make the process go so much easier if a visit had to be made to a doctor or medical facility with the card, of course. A lot of health insurance companies these days do have restrictions about which doctors you can go to, etc., but if it's an emergency it will be covered. You might want to call the health insurance company and question them about the details.
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