In the UK, Sweden and Estonia (the only places I have data for) it would be within this ballpark, never more than €1k (in their respective currencies).
Maybe, but because of outliers you can't then claim EU elective surgery is cheap when it obviously doesn't apply across the entire block. I'm sure it's cheap in some countries yes.
Would you like me to investigate the propensity of this EU wide, or are you being glib about knowing only a single country and that technically is 100% of your knowledge?
I could probably speak a little to the surrounding nordic countries to be honest, it is fair to assume they have similar systems because they are very similar in many areas.