Are you going to the US on vacation, or are you going to be there for an extended stay?
For extended stay you need something like this:
www.vhi.ie
For a holiday, you probably need topup on the below for the US because that won't go very far in the US - unless your particular policy has a much higher max.
If you look at say VHI travel insurance, I think their cover assumes you already have health insurance in place (see
https://www.vhi.ie/travel-insurance) and is on top of that.
Your Vhi Healthcare health insurance plan covers all your eligible in-patient hospital charges up to a maximum* of €65,000 / €100,000 if you need emergency treatment while on holidays abroad.
*Check your policy documents for the maximum amount on your plan.
Caring for you, home or away, you can have peace-of-mind with our emergency cover abroad on many of Vhi Healthcare's medical insurance plans. Find details on how to claim...
www1.vhi.ie