NJ Admin Code §11:22-1.6(c)

(c) If the carrier or its agent fails to pay a clean claim within the time limits set forth in N.J.A.C. 11:22-1.5, the carrier shall include simple interest on the claim amount at the rate of 10 percent per year and shall either add the interest amount to the claim amount when paying the claim or issue an interest payment within 14 days of the payment of the claim. Interest shall accrue beginning 30 or 40 days, as applicable, from the date all information and documentation required to process the claim is received by the carrier. The carrier may aggregate interest amounts up to $25.00, with the consent of the provider.