N.C. Gen. Stat. § 58-47-190

A TPA or service company shall not enter into any agreement or understanding with a self-insurer that makes the amount of the TPA's or service company's commissions, fees, or charges contingent upon savings affected in the adjustment, settlement, and payment of losses covered by the self-insurer's obligations. This section does not prohibit a TPA or service company from receiving performance-based compensation for providing medical services through a physician-based network or auditing services and does not prevent the compensation of a TPA or service company from being based on premiums or charges collected or the number of claims paid or processed.