Tenn. Code § 56-7-2304
The commissioner is authorized to adopt rules applicable to insurance policies and subscriber contracts provided by an insurance company or a nonprofit service corporation on a group or group-type basis establishing reasonable requirements for extension of benefits and determination of claim liability in the event of discontinuance of coverage for nonpayment of premiums or replacement of coverage by another carrier. All rules must be promulgated in accordance with the Uniform Administrative Procedures Act, compiled in title 4, chapter 5, and shall provide for any notices required that notice to the group policyholder or subscriber contract holder are deemed notice to the employee, member, or subscriber. No rule shall require the extension of coverage, except as to policies or contracts issued, altered, or amended after the effective date of the rule.
T.C.A. § 56-7-2304