We are off to the USA for 4 weeks, and I tried asking the insurance broker who handles our car and household insurance, as well as our mutuelle health insurance, for something to increase medical cover.
We have a Premier account with HSBC In France, and have quite good travel cover with that, but you hear such horror stories about the costs of medical care in the US, and we are both retired.
Insurer came back with €150,000 medical cover, which we did not feel was enough, so asked if more possible - the answer being that it was not.
Search online revealed CHAPKA ASSURANCES, who offered a policy called Cap Assistance 24h/24. Prices extremely reasonable, and available to anyone living in Europe and registered for state health care in the country they reside.
A few easy online questions later, we paid €189 for two folks travelling for 25 days, with €500,000 medical cover, and repatriation cover. Just the ticket!
Very impressed with the site and ease of use, clear links to explain the policy, and instant download of all the insurance documents and certificates in French, English and Spanish for both of us. We even know how much we can spend on a coffin!
To top it all, the policy is actually with Allianz, who is our insurer! So, strongly recommend you look at this site. Policies for backpackers, folks going abroad to work for a while, annual policies and single trip.