Tenn. Code Ann. § 32-11-113: Effect and interpretation of living wills

(a) A living will entered into before July 1, 2004, under this chapter shall be given effect and interpreted in accord with this chapter.

(b) A living will entered into on or after July 1, 2004, that evidences an intent that it is entered into under this chapter shall be given effect and interpreted in accord with this chapter.

(c) A living will entered into on or after July 1, 2004, that does not evidence an intent that it is entered into under this chapter may, if it complies with the Tennessee Health Care Decisions Act, compiled in title 68, chapter 11, part 18, be given effect as an individual instruction under that act.