N.Y. Comp. Codes R. & Regs. tit. 19 § 208.7
Any contrary provisions of these rules notwithstanding, the ringside physician may enter the ring during the progress of a match or exhibition at any time to fulfill his or her official duties. A ringside physician desiring to enter the ring for this purpose shall first signal the referee of his or her intention, upon which the referee shall stop the progress of the bout by signaling the timekeeper. At any time during the progress of a bout, the referee may stop the bout by signaling the timekeeper, and require the ringside physician to enter the ring to examine a participant. Nothing herein shall be deemed to prohibit the ringside physician from entering the ring to examine any contestant during rest periods, with or without invitation from the referee, nor shall anything herein be deemed to restrict the ringside physician's authority pursuant to any other section of this Part.
N.Y. Comp. Codes R. & Regs. Tit. 19 § 208.7