N.J. Stat. § 17B:27B-20
A third party billing service shall not conduct any business with a client in the absence of a written agreement between the billing service and the client. The agreement shall be retained as part of the official records of the third party billing service for the duration of the agreement.
The agreement shall include the services to be provided by the third party billing service on behalf of the client; financial arrangements to be used if the third party billing service accepts monies from benefits payers on behalf of a client; provisions setting forth the respective liability of the client and the third party billing service for the accuracy and eligibility of submitted claims, and for the prompt submission of claims pursuant to the provisions of P.L. 1999, c. 154(C.17B:30-23 et al.); and the responsibilities of the third party billing service to the client with respect to the maintenance of appropriate back-up systems against the loss of records, and the maintenance of appropriate insurance coverage by the third party billing service against the risk of loss.
N.J.S. § 17B:27B-20