S.C. Code Ann. § 38-71-760
(l) This subsection applies to the prior carrier.
(2) For health insurance coverage as defined in Section 38-71-840, in all situations except the prior carrier's withdrawal from the large group market, the small group market or both markets in this State, the liability of the prior carrier for extension of benefits terminates at the earliest of the following:
(m) This subsection applies to all groups.
(2) Each person not covered under the succeeding carrier's plan of benefits in accordance with item (1) of this subsection (m) nevertheless must be covered by the succeeding carrier in accordance with the following rules if the individual was validly covered, including benefit extension, under the prior plan on the date of discontinuance and if the individual is a member of the class of individuals eligible for coverage under the succeeding carrier's plan. Any reference in the following rules to an individual who was or was not totally disabled is a reference to the individual's status immediately prior to the date the succeeding carrier's coverage becomes effective.
(B) Coverage must be provided by the succeeding carrier until at least the earliest of the following dates:
(4) In the case of a preexisting conditions limitation included in the succeeding carrier's plan, the level of benefits applicable to preexisting conditions of persons becoming covered by the succeeding carrier's plan in accordance with this subsection (m) during the period of time this limitation applies under the new plan must be the lesser of: