It may still be possible to file a claim without a police report. In a personal injury claim, for example, you need to prove that the other party owed you a duty of care, that the duty of care was breached, that the breach of the duty of care was the proximate cause of your injuries, and that you’ve suffered damages. Depending on the amount of evidence that exists, you may still be able to prove these four elements.
Without a police report, there is additional work that you will need to do in order to prove that the accident happened, prove the fault of the other party, and prove that your damages are connected to the crash. This is something an experienced car accident attorney may be able to help with by investigating your case, tracking down witnesses, bringing in accident reconstruction experts, and more.