N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 329-1.2
When the schedule specifies a unit fee for a definite treatment and period of aftercare, and the patient is transferred from one to another physician, the employer (or carrier) is responsible for the amount stated in the schedule. If the concerned physicians agree upon amount of proration, they shall render separate bills accordingly; in the event of no agreement, the matter shall be settled by by an arbitration committee appointed pursuant to section 13-g of the Workers' Compensation Law without cost to the contestants. When treatment is terminated by death before the expiration of the allowable period of aftercare, the appropriate fee shall apply without proration. When treatment is terminated by departure of the injured worker from New York State before the expiration of the allowable period of aftercare, the fee shall be the earned portion of the appropriate fee, having regard for the fact that generally the greater portion is earned at the time of operation or other procedure.
N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 329-1.2