Don't worry guys. Have good insurance and they already know about the potential problem. Thanks for the concern though!
Just out of curiosity, would they not charge extra for that, as it is effectively a pre-existing condition, or one which still exists at the time of flight?
If they don't, do you have an annotation in writing on the policy stating that they are aware - or at least a record of the phone call, who you spoke to and which call centre they were based in, as that kind of knowledge can easily go wrong.
It sounds like it is well on the mend, but any condition is just that, until it has completely gone (and there still could be healing below the surface for a little while after).
However, I note that EHIC does cover pre-existing and even chronic conditions. That's ok in Switzerland too, but I note Andorra has a 'special relationship' with the EU - I trust that counts for a little more than ours with the US?