@Shane ****
Of course they can be used in USA.
Perhaps what you meant to say was that Lloyds doesn’t meet some requirements of the Affordable Health Care Act, or that your physician doesn’t accept them for direct payment… but I assure you they will write a catastrophe policy, and you can claim, and they will pay anywhere in the world, including the United States.
Not only that, but they have done so reliably for hundreds of years.