I am posting this again to see if anyone knows anything.
My husband goes to Paris and Rotterdam and although we get our fare re imbursed, usually! no help is given for overnight stays.
I understand if you choose to go to another area, but when you have no choice it doesnt seem in accord with the patients charter, that all patients should receive the same level of care regardless of location or financial means.
In fact rotterdam is the only place that does not hospitilise patients for treatment; whereas for example Bad Berka does and relatives can stay for 9 euros night
you have to get a devis from the station, then go to your nearest office and declare that you will pay any difference back and that you agree to forward all tickets etc promptly.
we have done this twice now and it has worked well.
I run a french:english conversation group and none of our french friends realised you can do this.