N.J. Stat. Ann. § 45:9-27.6

Any physician or surgeon who renders treatment which he knows or reasonably should know is or will be related to, or is or will be the basis of, a legal claim for workmen's compensation or damages in negligence shall provide his patient with a true, accurate and itemized copy of the bill for treatment rendered. Such physician or surgeon should certify and attest by his signature on all originals and copies of such bills to the actuality and accuracy of the examinations and treatments rendered and the amounts charged for them.