Call directly to your insurance company.
Contact either your broker or the insurance company on your Declarations Page of your policy and ask them. If you want to inquire about a 3rd party's insurance (e.g., you want to make sure your contractor has valid insurance), you can ask for a certificate of insurance. If you feel the certificate is fake, call the insurance company that issued the certificate. Also, if it is a contractor, you can contact your state contractor's license board, which regulates the licensing, bonding, and insuring requirements for contractors.