S.C. Code Ann. § 38-71-210

If an insurer offers a policy containing a provision for medical expense benefits that does not provide payment for chiropractic services, it shall offer as a part thereof an optional rider or endorsement, if specifically requested by the insured or subscriber under an individual policy or a certificate holder or subscriber under a master policy, which defines such benefits as including payment to a chiropractor for procedures specified in the policy which are within the scope of the practice of chiropractic. Any additional cost to the insured or certificate holder must be reasonably related to benefits provided.