The tone of a Subrogation Letter should be professional, firm, and clear, but not overly aggressive. I received a subrogation letter for medical treatment for a dog bite, but the owner was homeless.Do I need to hire an attorney? Subrogate: to put in the place of another, especially to substitute (as a second creditor) for another with regard to a legal right or claim. The Plaintiff, above named, complaining of Defendants, above named, alleges and says as follows: 1. Customer: Hello, I recently received a subrogation claim in the mail for a car wreck I was at fault in last year. They say I owe 19,654.40. What is subrogation? Why am I being asked to waive it? Attorneys at the Whitley Law Firm can help you keep as much money as possible from your personal injury settlement or judgment.