Tenn. Code § 49-1547
Once each year following retirement of a member on a disability retirement allowance, the board of trustees may, and upon his application shall, require any disability beneficiary who has not yet attained the age of sixty (60) years to undergo a medical examination, such examination to be made at the place of residence of said beneficiary or other place mutually agreed upon, by a physician or physicians designated by the board of trustees. Should any disability beneficiary who has not yet attained the age of sixty (60) years refuse to submit to at least one (1) medical examination in any such year by a physician or physicians designated by the board of trustees, his state annuity may be discontinued until his withdrawal of such refusal, and should his refusal continue for one (1) year, all his right in and to his state annuity may be revoked by the board of trustees.
T.C.A. § 49-1547