[Code of Federal Regulations] [Title 45, Volume 1] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 45CFR162.610] [Page 720] TITLE 45--PUBLIC WELFARE SUBTITLE A--DEPARTMENT OF HEALTH AND HUMAN SERVICES PART 162_ADMINISTRATIVE REQUIREMENTS--Table of Contents Subpart F_Standard Unique Employer Identifier Sec. 162.610 Implementation specifications for covered entities. (a) The standard unique employer identifier of an employer of a particular employee is the EIN that appears on that employee's IRS Form W-2, Wage and Tax Statement, from the employer. (b) A covered entity must use the standard unique employer identifier (EIN) of the appropriate employer in standard transactions that require an employer identifier to identify a person or entity as an employer, including where situationally required. (c) Required and permitted uses for the Employer Identifier. (1) The Employer Identifier must be used as stated in Sec. 162.610(b). (2) The Employer Identifier may be used for any other lawful purpose. [67 FR 38020, May 31, 2002, as amended at 69 FR 3469, Jan. 23, 2004] Subparts G-H [Reserved]