If you were involved in a car accident and a police report was filled out do you have to report it to insurance company?

No. That happens all the time. People often make a police report just in case they decide to make a claim. Later, they never contact their insurance company due to it not being worth the hassle. Four years ago, I was involved in a minor accident in which the other person left. I made a police report but since the damage was so little, the officer told me I'd be better off not making a claim. I never made a claim or notified my insurance. I have since bought 2 new cars that have been quoted for insurance by multiple companies and insured by the same company I had at the time of the accident. Everything has been fine; haven't heard about it since then.