My question is about having non-emergency surgery in Ramadan, and what it results in of not fasting for several days. Is that permissible? Please note that delaying it until after Ramadan will result in missing out on the surgery because the surgeon will be travelling, and because of my work circumstances.

Praise be to Allah 

If delaying the surgery until after Ramadan will exacerbate
the sickness, or delay recovery, resulting in hardship and trouble, or the
delay will result in problems, such as if the alternative appointment is
relatively far off, or will cause you to miss out on having the surgery
performed by a skilled doctor, then there is nothing wrong with doing it in
Ramadan, even if the surgery causes the patient to break the fast.

But if it is possible to delay it until after Ramadan without
causing any hardship or difficulty, then it is not permissible for the
patient to break the fast because of that, because the fast of Ramadan is
obligatory, and cannot be omitted because of something that it is possible
to delay. 

This is a summary of what our Shaykh, ‘Abd ar-Rahmaan al-Barraak
(may Allah preserve him) advised us. 

See also the answer to question no.
141646
and 12488 

And Allah knows best.