N.Y.C. Admin. Code § 17-124: § 17-124 Aliens.

The commissioner may send to such place as he or she may direct, all aliens and other persons in the city, not residents thereof, who shall be sick of any communicable disease. The expense of the support of such aliens or other persons shall be defrayed by the city, unless such aliens or other persons shall be entitled to support from the commissioner of immigration and naturalization of the United States.