In reply to alexm198:
To the best of my knowledge they do not need a certificate. I simply renew my membership each year, but even though aged there never has been any question of that, at least for climbing, skiing and Alpinism. Being still part of the EU a UK doctor should certainly be acceptable if necessary. Sorry, I am not in Cham at present so can't help by asking them. But I have checked my policy and seen nothing implying it requires a certificate. The only situation this might be relevant would be a pre-existing medical condition. Incidentally the coverage is operated through AXA.