N.J. Stat. § 17B:27-65
A health insurer which offers a group health plan may not require an individual, as a condition of enrollment or continued enrollment under the plan, to pay a premium or contribution which is greater than the premium or contribution for a similarly situated enrollee in the plan on the basis of any health status-related factor in relation to the individual or to an enrollee or a dependent of the individual or enrollee. This provision shall not be construed to restrict the amount that an employer may be charged for coverage under a group health plan or to prevent a health insurer offering group health insurance coverage from establishing premium discounts or modifying otherwise applicable copayments or deductibles in return for adherence to programs of health promotion and disease prevention.
N.J.S. § 17B:27-65