N.J. Stat. § 18A:16-15
Any contract or contracts permitted under this act shall contain limitations, exclusions or exceptions so as to avoid duplication of benefits or services otherwise available pursuant to accidental death and dismemberment, hospitalization, medical, surgical, major medical expense or health and accident coverage under any other law of this State or the coverage afforded under the laws of the United States, such as the Federal Medicare Program, and at the option of the local board of education and the carrier, group insurance or any other arrangement of coverage for individuals in a group, whether on an insured or uninsured basis.
Any contract permitted under this act may condition the eligibility of any employee upon satisfying a waiting period stated in the contract.
N.J.S. § 18A:16-15