Americans living abroad during treatment

[Esther]

Chris and I are discussing renting a flat in Paris and spending 6 months to a year there. However I am on Herceptin every 3 weeks right now, and will continue to do so for the foreseable future.

I am covered by 2 US health insurance policies. Does anyone know if they will only cover treatment done here in the US? Would I have to pay out of pocket for the herceptin infusions done in Europe?

There would also be office visits, blood tests and scans if needed that would need to be done as well.

Any input would be appreciated.