N.Y. Comp. Codes R. & Regs. tit. 10 § 441.339
The physical appearance of an outpatient at a hospital complex is recognized as contributing one visit regardless of the number of diagnostic and/or therapeutic services the patient receives or the number of sections (clinics), operating rooms, laboratories and treatment areas in which he/she receives them. The classification of the visit (i.e., emergency, clinic, etc.) will be determined by the first location where service is rendered. A patient referred from a physician's office exclusively for a specific ancillary service or services is classified as one referred ambulatory visit. A laboratory examination of a specimen sent in by a physician for his/her patient shall be included as one referred ambulatory visit.
N.Y. Comp. Codes R. & Regs. Tit. 10 § 441.339