Es un registro que contiene información de la Seguridad social sobre cada solicitante que ha solicitado prestaciones

The Master Beneficiary Record (MBR) contains information about each claimant who has applied for RSI or DI benefits, or to be enrolled in the Hospital or SMI programs; a record of the amount of Federal tax withheld on benefits paid to nonresident aliens; and the aggregate amount of benefit payments, repayments and reductions with respect to an individual in a calendar year. A record is maintained under each individual's Social Security number (SSN). However, if the individual has filed on another person's SSN, only a short ``pointer'' record is maintained. Personal and general data about the claim is maintained under the SSN of that claim. Data about the claimant can be accessed using the claimant's SSN or the SSN on which benefits have been awarded or claimed (claim account number (CAN)).