The TIN Reference File. The TIN Reference File consists of a business entity’s federal TIN and the firm’s business mailing address that is linked to the particular TIN as reported in Field 21 (Employer TIN) and Field 22 (Insurer TIN) of an MSP Input File Record. Any TIN submitted on any MSP Input Record must be included in the TIN Reference File for the record to process. The same firm can have more than one TIN. For example, an employer can be both a Health Maintenance Organization (HMO) and a separate and distinct specialty medical center. Because they are separate business operations, each could have its own TIN, and each TIN may be associated with a distinct business mailing address. (Note: The TIN is the same as the federal Employer ID Number, the EIN.) The mailing address associated with each TIN should be the address to which health care insurance coordination of benefits issues should be directed. This mailing address will help CMS and others to direct correspondence to the most appropriate contact at the VDSA partner. The VDSA partner’s TIN Reference File should be comprised of all the TINs relevant to the VDSA partner’s business as it relates to CMS. For example, an employer’s TIN Reference File may consist of just the one employer and insurer TIN and associated business address of the employer and insurer that administers all aspects of the employer’s health benefit coverage. However, if more TINs are relevant (an employer uses two different insurers, for example) all need to be reported.
