No interrogation part? No 吗？
Expect 吗 only in Yes-or-no questions.
几点 is a question structure by itself; 吗 is not needed
I think you only need 马 when you don't have a question word yet. Here you have 几点 meaning "what time?"
That is not a question that you can answer with "yes" or "no"
Why is "医生几点钟上班" not accepted? The only difference is the use of 几点钟 for "what time" instead of 几点.
Can you also say 什么时候医生上班？
用 "什么时候" 对吗?