Death Master File

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The Death Master File (DMF) is a computer database file made available by the United States Social Security Administration since 1980. It is known commercially as the Social Security Death Index (SSDI). The file contains information about persons who had Social Security numbers and whose deaths were reported to the Social Security Administration from 1962 to the present; or persons who died before 1962, but whose Social Security accounts were still active in 1962. As of 2009, the file contained information on over 83 million deaths. In 2011, some records were removed from the file.[1]


The data include:

  • Name (Given name, surname), since 1990s the middle initial
  • Date of birth (Year, Month, Day)
  • Date of death (Year, Month), since 2000 the day of month
  • Social Security number
  • Whether death has been verified or a death certificate has been observed.

In 2011, the following information was removed:

  • Last ZIP code of the person while alive
  • ZIP code to which the lump sum death benefit was sent, if applicable

The Death Master File is a subset of the Social Security Administration's Numident database file, computerized in 1961,[2] which contains information about all Social Security numbers issued since 1936. The Death Master File is considered a public document under the Freedom of Information Act, and monthly and weekly updates of the file are sold by the National Technical Information Service of the U.S. Department of Commerce.[3] Knowing that a patient died is important in many observational clinical studies and is important for medical research.[4] It is also used by financial and credit firms and government agencies to match records and prevent identity fraud.

The Death Master File, in its SSDI form, is also used extensively by genealogists. Lorretto Dennis Szucs and Sandra Hargraves Luebking report in The Source: A Guidebook of American Genealogy (1997) that the total number of deaths in the United States from 1962 to September 1991 is estimated at 58.2 million. Of that number, 42.5 million (73 percent) are found in the Death Master File. Other research published by the Social Security Administration in 2002 suggests that for most years since 1973, 93 percent to 96 percent of deaths of individuals aged 65 or older were included in the DMF.[5] Today the number of deaths, at any age, reported to the Death Master File is around 95 percent.


Social Security Administration distributes the file via National Technical Information Service. In May 2013, the cost of a single download (with no weekly or monthly or quarterly annual subscription costs) was $1825.[6]


  1. ^ "Important Notice" (PDF). The National Technical Information Service (NTIS) has been notified by the Social Security Administration (SSA) of an upcoming important change in the Death Master File data. NTIS, a cost-recovery government agency, disseminates the DMF data on behalf of SSA. Please see the attachment, provided by SSA, for an explanation of the change. The implementation date of this change is November 1, 2011.
  2. ^ Social Security Administration, Detailed Chronology: 1960s. The DMF contains about 99,000 deaths for 1961, and about 301,000 deaths for 1962.
  3. ^ NTIS Products: Social Security Administration's Death Master File, National Technical Information Service.
  4. ^ Huser, V.; Cimino, J. J. (2013). "Don't take your EHR to heaven, donate it to science: Legal and research policies for EHR post mortem". Journal of the American Medical Informatics Association. 21 (1): 8–12. doi:10.1136/amiajnl-2013-002061. PMC 3912713. PMID 23966483.
  5. ^ Mark E. Hill and Ira Rosenwaike, "The Social Security Administration’s Death Master File: The Completeness of Death Reporting at Older Ages", Social Security Bulletin, Vol. 64, No. 1, 2001/2002.
  6. ^ "NTIS form" (PDF). Archived from the original (PDF) on 7 June 2013. Retrieved 15 May 2013.

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