Tenn. Code § 56-30-135
Notwithstanding any other law to the contrary, subject to approval by the commissioner, a nonprofit dental service corporation only providing dental plans and policies in this state has the authority to provide plans and polices for vision services in this state in the same manner as nonprofit corporations organized under chapter 27, 28, or 29 of this title, or an insurance company properly qualified in this state to write accident, health, or disability insurance. In order for a nonprofit dental service corporation to provide plans and policies for vision services in this state, the nonprofit dental service corporation must not provide vision services in any other state and must comply with §§ 56-31-111 - 56-31-118, 56-31-121, and 56-31-123 - 56-31-129.
T.C.A. § 56-30-135