Legal Question in Insurance Law in California

Send him a letter formally demanding that he compensate you. List your medical expenses (if you don't have complete information yet, tell him what you know and explain what is still in the pipeline), lost income, and any other losses. Describe your pain. And tell him you will have to sue if you and he can't come to an agreement. He will probably give the letter to his insurer, and they will contact you.

If you don't hear from the insurer in a few weeks, send a follow-up letter. If that still doesn't get you results, you may need to file a lawsuit. You will then be able to demand his insurance information in discovery.

Please note that my answer presumes you have plenty of time before the statute of limitations runs out. But your question doesn't say when you were injured, so I don't know how much time you have left -- if any. You may not have enough time to take all the steps I have suggested.

Your best bet is probably to meet with a lawyer ASAP and discuss your rights. You might also want to have the lawyer write your demand letter, since letters from lawyers tend to be taken more seriously.

Good luck.