New Jersey Statutes Title 39. Motor Vehicles and Traffic Regulation 39 § 6A-4.4

The amendments to section 13 of P.L.1983, c. 362 (C. 39:6A-4.3) contained in section 1 of this amendatory and supplementary act shall apply to any accident occurring on or after the effective date of this amendatory and supplementary act involving an automobile insurance policy in force on, or issued on or after the  1 that date, under which the named insured has elected a medical expense deductible in accordance with subsection a. of section 13 of P.L.1983, c. 362 (C. 39:6A-4.3). Any additional premium that may be owing on an existing policy by reason of the application of those amendments shall be debited to the account of the named insured and shall be payable at the time of payment of the next policy premium.