No interrogation part? No 吗？
Expect 吗 only in Yes-or-no questions.
I think you only need 马 when you don't have a question word yet. Here you have 几点 meaning "what time?"
'Chi dian' is enough
That is not a question that you can answer with "yes" or "no"
几点 is a question structure by itself; 吗 is not needed
Can you also say 什么时候医生上班？