Tenn. Code § 56-7-1205
Nothing contained in this part shall be construed as requiring the forms of coverage provided pursuant to this part, whether alone or in combination with similar coverage afforded under other automobile liability policies, to afford limits in excess of those that would be afforded had the insured under the policies been involved in an accident with a motorist who was insured under a policy of liability insurance with the minimum limits described in § 55-12-107, or the uninsured motorist liability limits of the insured's policy if the limits are higher than the limits described in § 55-12-107. The forms of coverage may include terms, exclusions, limitations, conditions, and offsets that are designed to avoid duplication of insurance and other benefits.
T.C.A. § 56-7-1205