New York Codes, Rules and Regulations
Title 18 - DEPARTMENT OF SOCIAL SERVICES
Chapter II - Regulations of the Department of Social Services
Subchapter E - Medical Care
Article 5 - Procedures and Forms
Part 540 - Authorization Of Medical Care
Section 540.9 - Filing of authorizations, bills and related documents

(1) Notifications and authorizations for medical services (either the originals, if available, or copies thereof) shall be maintained on file in the public welfare agency in such a manner as to facilitate audit. If the notification and authorization constitute separate documents, each notification and the authorization relative to it shall be filed together.

(2) Paid bills for medical services shall be maintained on file by the public welfare agency in a manner to facilitate audit and shall be filed in voucher number sequence, or in sequence as listed on the payment rolls.