ask for malpractice insurance

You can send him a certified letter asking for his insurance information and telling him to notify his insurance company of your potential claim. Provide your contact information in the letter so his insurance company can contact you. Or, if you retain an attorney, he or she will do that for you.

https://www.avvo.com/legal-answers/how-can-i-find-my-doctors-malpractice-insurance-co-2151350.html