You don't need the article necessarily in American usage, see http://ell.stackexchange.com/questions/51738/have-you-ever-had-surgery-why-does-surgery-in-this-sentence-have-no-article
What part of the Turkish makes this specifically 'THE surgery' as opposed to just 'surgery', please? From an English perspective there is nothing wrong with asking "What time, (or when), is surgery?" 'The surgery' means a specific procedure, or operation; while 'surgery' implies surgery in general, or a general practitioner's opening hours. I tried "When is surgery" and "What time is surgery" (both of which were marked as wrong), before I realised it was the offending lack of "The".