Tennessee Code Title 50. Employer and Employee § 50-3-407

(a) Penalties provided for by §§ 50-3-402 -- 50-3-408 shall be imposed in the following manner: whenever the commissioner has determined that a penalty should be assessed against an employer, the commissioner shall issue a written notification to the employer by certified mail, stating the amount of the penalty to be assessed, the reason for the assessment, which may be done by reference to citations issued prior to or simultaneously with the notification, and informing the employer of the employer's right to appeal to the occupational safety and health review commission.

(b) If, within twenty (20) days from the receipt of notification, the employer fails to notify the commissioner that the employer intends to contest the imposition of the penalty, the assessment of a penalty as stated in the notification shall be deemed a final order of the commissioner, and shall not be subject to further review.