Yes, Upsc is always a good choice be it mbbs or arts and science. When you compare the toppers of previous years, you can see examples like Roman saini and Artika Shukla who were doctors and wished to serve the society. But make sure you work smart and hard and keep yourself motivated throughout the entire journey as the only key to crack UPSC is consistency in preparation. You can even choose medical science as your optional subject in the main examination.
All the best!