N.J. Stat. § 30:4-70
When any patient shall be committed to any State or county institution with the cost of his maintenance chargeable to either the State or county, and it shall subsequently appear that such patient, or some person chargeable with his care and maintenance as provided for in this article, is able to pay all or any part of his care and maintenance, including arrearages, the Attorney General, the county counsel, or county adjuster, as the case may be, shall, as soon as he shall obtain such information, apply to the judicial officer for the reopening of the matter, and such judicial officer shall have the power at any time, in his discretion, to reopen the case, take additional testimony and inquire into the facts, and may determine if there shall be sufficient moneys to pay any part of such maintenance, as provided in section 30:4-60 of this Title, and make such further order requiring the estate of such patient or the person or persons so chargeable by law to pay such amount for the care and maintenance of such patient as shall be specified in such order, and shall make such further order as may be necessary.
N.J.S. § 30:4-70