Medical expense can be the biggest issue. Are you citizen or holding green card of USA ? otherwise I don't think you are illegible for government health insurance, ex : healthy family or medical or even medicare. You can tried to purchase health insurance from blue cross, blue shield,or health net. I suggest you to call the company before you arrive the United Stats. In my cases, my child had fever 103F to 104F. The pediatric Dr. wouldn't accept her in regular clinic office. He ask us to take the child to Emergency Room. We spend 3 to 4 hours in the ER. The hospital charge us $4600. Yes, no kidding. Luckily, we had insurance with us. So all we need to pay is co payment. So, I strongly recommend you to make sure you will be cover from any kind of insurance Adult or children before you entering the United Stats.