Tenn. Code Ann. § 71-1-120

This section shall be construed, insofar as is practicable, so as to be consistent with Title XX of the Social Security Act (42 U.S.C. §§ 1397 et seq.), and regulations issued under the authority of that act. The commissioner shall take reasonable steps to assure that the cost of administering, monitoring, and overseeing services performed by public providers and private providers shall be accomplished as economically as practicable. In the event that such expenditures are estimated to exceed six percent (6%) of the total estimated expenditures for services provided by public providers and private providers, the commissioner shall include in the annual service plan a statement to that effect, accompanied with an explanation of the reasons why such expenditures cannot be held to or below six percent (6%) of the estimated cost of services provided by public and private providers.