A Subrogation Letter should clearly state the facts of the case, including details of the incident (e.g. Edit, sign, and share example of subrogation complaint in il online.No need to install software, just go to DocHub, and sign up instantly and for free. This form is available on Westlaw. Easily search more than 600,000 legal forms to find the exact form you need. Please attach a copy of the notice you received from your insurance company with this complaint form. Here is everything you need to know about subrogation claims, a type of thirdparty claim. How Long the Process Takes. A subrogation letter is a document that allows one party to assert the rights and claims of another party against a third party. If an insurance company filed a subrogation claim for property damage against you, a skilled property damage attorney could can help you.