N.Y. County Law § 834-A
Where a contract has been entered into between a social services district and a hospital, pursuant to section three hundred sixty-seven of the social services law, or between a social services district and a day care center for day care furnished children on behalf of the social services district, or between a social services district and a nursing home or health related facility for care furnished patients in the nursing home or health related facility on behalf of the social services district, the board of supervisors of the county may, by resolution, determine that not to exceed seventy-five per centum of the total claim submitted to the county or the social services district by such hospital or such day care center or such nursing home or health related facility for charges and services under such contract for each month shall be paid, in advance of audit, subject to subsequent adjustment of accounts between the hospital or the day care center or the nursing home or health related facility and the county or social services district following audit.
N.Y. CountyLaw § 834-A