Mississippi Code Title 83. Insurance § 83-11-103

(i) A motor vehicle as to which there is no bodily injury liability insurance; or

(ii) A motor vehicle as to which there is such insurance in existence, but the insurance company writing the same has legally denied coverage thereunder or is unable, because of being insolvent at the time of or becoming insolvent during the twelve (12) months following the accident, to make payment with respect to the legal liability of its insured; or

(iii) An insured motor vehicle, when the liability insurer of such vehicle has provided limits of bodily injury liability for its insured which are less than the limits applicable to the injured person provided under his uninsured motorist coverage; or

(iv) A motor vehicle as to which there is no bond or deposit of cash or securities in lieu of such bodily injury and property damage liability insurance or other compliance with the state financial responsibility law, or where there is such bond or deposit of cash or securities, but such bond or deposit is less than the legal liability of the injuring party; or

(v) A motor vehicle of which the owner or operator is unknown; provided that in order for the insured to recover under the endorsement where the owner or operator of any motor vehicle which causes bodily injury to the insured is unknown, actual physical contact must have occurred between the motor vehicle owned or operated by such unknown person and the person or property of the insured; or

(vi) A motor vehicle owned or operated by a person protected by immunity under the Mississippi Tort Claims Act, Title 11, Chapter 46, Mississippi Code of 1972, if the insured has exhausted all administrative remedies under that chapter.