Sure looks replaceable to me.
My 2005 QBP catalogue lists a hanger for 91-2004 Cannondale mountain bikes. The picture looks alot like, but not quite identical to yours. It definitely looks like it's designed to hand off behind the seat stays like on your bike. An LBS will probably charge you between $25.00 and $30.00 for the part.
You also might try derailleurhangers.com. It's an aftermarket Wheels Mfg. part so my bet is they'll have it.