Is a new visa required?

I was an F1 student in the US and after my second semester, I had to go back to my native country due to some health issues. Now I’ve submitted a return petition to the same university and I’m planning to finish my masters. My visa expires in 2019 and my SEVIS ID hasn’t changed on the new i20 so I’m wondering if I need to get the new visa or I can travel with the current one.

You can use the old visa till 2019 as your continuing the same course in the same university.