Traveler's insurance
If you are not planning on living here, your best bet would be short term traveler's insurance. There are lots of plans, offerred by lots of companies and depend of what type of coverage you are looking for. Short term insurance like this are intended to cover rather emergencies - such a heart attacks and accidents and usually include repatriation coverage that will get you home quickly and back on the books of your home insurance company. This assumes that you have good health insurance at home.
It will also assume that you will pick up incidental charges - such as physical therapy -
You can just google - there are some which are run by Aetna in the States and some run out of the UK. If you get stuck and need more help, send me a PM and I will send you the email of my broker, who can answer your questions.