First thing you need to do is open a claim with your insurance carrier and they will contact HIS insurance. Opening the claim PROTECTS YOU. I'm an attorney in So Cal and have seen these things go backwards quickly. All of a sudden, the incident is being blamed on YOU! Funny how that happens.
Everything should be paid for with no deductible out of your pocket.
BTW, even though you open a claim, you can close it if you notify your insurance that you and the other guy settled.
Keep an eye on your "sore neck" too. You could have a more serious injury than you think.