You live in CA, so if the guy was insured and at least 51% at fault, you're completely covered. This includes your bike and any damaged parts/equipment as well as your hospital visit and compensation for any time off the bike due to the incident. I've never needed a police report for an accident, but you need to report it to the driver's insurance company as well as the DMV. The driver will get the same points on his record whether they replace just the shifters or the whole bike, so don't skip the scratched stuff thinking you're doing anyone a favor. Not that I'm saying to milk it like Spacemunkey suggests, but you deserve to have everything the way it was before the accident.