N.J. Stat. § 18A:66-40
If his earnings have changed since the date of his last adjustment, then the amount of his pension may be further altered; but the new pension shall not exceed the amount of pension originally granted.
If a disability beneficiary, while under the age of 60 years, refuses to submit to at least one medical examination in any year by a physician or physicians designated by the system, his pension shall be discontinued until withdrawal of his refusal. If the report of the medical board shall show that such beneficiary is able to perform either his former duty or other comparable duty which his former employer is willing to assign to him, the beneficiary shall report for duty; such a beneficiary shall not suffer any loss of benefits while he awaits his restoration to active service. If the beneficiary fails to return to duty within 10 days after being ordered so to do, or within such further time as may be allowed by the board of trustees for valid reason, as the case may be, the pension shall be discontinued during such default.
Such person shall be reenrolled in the retirement system and shall contribute thereto at a rate based on his age at the time of his prior enrollment. Such person shall be treated as an active member for determining disability or death benefits while in service and no benefits pursuant to an optional selection with respect to his former membership shall be paid if his death shall occur during the period of such reenrollment.
Upon subsequent retirement of such member, he shall receive a retirement allowance based on all his service as a member, computed in accordance with applicable provisions of this article, but the total retirement allowance upon subsequent retirement shall not be a greater proportion of his final compensation than the proportion to which he would have been entitled had he remained in service during the period of his prior retirement. Any death benefit to which such member shall be eligible shall be based on his latest retirement.
N.J.S. § 18A:66-40