It's not exactly insurance, and is a bit costly ($450.00/year) but the thing that gives me the most comfort as I poke about the world is carrying the American Express Platinum Card.
They offer medical assistant virtually anywhere, give access to a sufficiently large amount of cash to get one out of most 'sticky situations', and a bunch of other benefits too; such as baggage insurance, and automatic insurance coverage when you rent a car (and I save the pricey card cost in what I don't have to pay the car rental companies for the 'optional insurance' they offer when I rent).
However, what I like most is that I HAVE been in a tight situation (not medically, but otherwise) and American Express came through.
I won't bother with all the details, but I was left stranded in an African county without a single cent, no credit cards left, and no passport or identification papers. The collect calls to Discover Card, Master Card and Visa only resulted in "we will cancel the card and issue you another one - mailed to your home address". It took over six weeks for me to actually get my hands on the first one of those replacement cards.
On the other hand, as soon as they verified my autheticity over the phone (against the information in their files), the call to AMEX resulted in: (1) cancellation of the missing card; a free hot meal; (2) a place to stay; (3) near immediate issuance of a replacement card PLACED RIGHT INTO MY HAND; (4) arrangements for me to get a generous amount of cash for my immediate needs (from a local bank) on that newly issued AMEX card (5) WITHOUT ANY IDENTIFICATION PAPERS; (6) an appointment with the nearest American Consulate to get a new temporary passport issues, (7) as well as directions on precisely how to get there and (8) who to speak with (a person they had already contacted and briefed on the situation); (9) a personal toll free contact number and identity code number to call them back, should I need any further assistance ... and (10) ALL of that they made happen ON A NATIONAL HOLIDAY WEEKEND in the country I was stranded in!
Like their adds say; I won't leave home without it!
Ed
TGMM Family of the Bow