Nikon lens problem

It is hard to answer your question, since you don't say what kind of accident took place.  Since that camera is over 2 years old, I would have to think that for less money that it would take to fix, you can get a better replacement.  For example, the Nikon L15, which you can pick up for ~$140 is an 8 MP, 3x zoom like the 5900, but adds image stabilization as well.  It is about the same ease of use, but has some nice new features, like Nikon's D-Lighting which helps recover shadows.