N.J. Stat. Ann. § 30:11-10

6. The provisions of article 3 of chapter 4 of Title 30 of the Revised Statutes, except as concerning or pertaining to the investigation and determination of legal settlement and indigence of patients, shall apply to duly licensed private mental hospitals for the care and treatment of persons with a mental illness, a mental deficiency, and an intellectual disability and every license issued hereunder shall be the licensee's authority to receive and hold a person duly admitted or committed pursuant to law.