Tennessee Code Title 56. Insurance § 56-7-107

In any action against an insurance company by the holder of a certificate issued under a policy of group insurance, the defendant shall be required to attach to its pleading in the action a copy of a group insurance policy under which the certificate was issued, on which suit is brought, and the copy shall be receivable in evidence, without any cost to plaintiff, and the copy shall be duly attested and sworn to.