2010 New York Code
SOS - Social Services
Article 4 - (117 - 122) RESIDENCE AND REMOVAL
118 - Qualification on residence.

§ 118.  Qualification on residence.  The continuous residence required
  to  acquire  state  residence  or to establish liability for payment for
  hospital or other institutional care shall not include any period during
  which the person was (a) a patient in a hospital, or
    (b)  an inmate of any public institution or any  incorporated  private
  institution, or
    (c)   if a child under the age of twenty-one years, in a boarding home
  under the care of an authorized agency, or
    (d)  residing on any military reservation.
  If, however, the periods of residence immediately prior  and  subsequent
  to  the  period  specified  in  a,  b, c, or d, shall together equal the
  required period of residence, such person shall be deemed  to  have  had
  the required continuous residence.