There are several good travel insurance companies who sell a one-year policy. A couple that I would suggest looking at to see if they'll work for you are Travel Safe and Allianz. Do not assume a big name is the best policy - we fired 3 of the biggest names in the business because of really bad customer service.
But you can go to the website insuremytrip.com and get a look at some other companies who may also provide extended travel insurance policies.
Travel Agent/Cruise Specialist w/12 yrs exp and 47 Cruises on 11 cruise lines! Favorites: Paul Gauguin - Tahiti: Uniworld River Cruises - Europe; Celebrity Solstice-class ships; Holland America - 12-nights Baltics & Russia; RCCL - 14-nights Greek Isles, Turkey, & Croatia; Holland America - 14-day Alaskan cruisetour; 10-night Canada/New England cruise; 21 days Hawaii w/7-night NCL cruise; Oceania - 25 days in Asia; more than 3 months touring Europe by train. And many all-inclusive resorts!