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The Death Master File 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 (). The data include: * Given name and surname; and since the 1990s, middle initial * Full date of birth * Month and year of death; or full date of death for accounts active in 2000 or later * 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,〔Social Security Administration, (Detailed Chronology: 1960s ). The DMF contains about 99,000 deaths for 1961, and about 301,000 deaths for 1962.〕 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.〔NTIS Products: (Social Security Administration's Death Master File ), National Technical Information Service.〕 Knowing that a patient died is important in many observational clinical studies and is important for medical research. 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.〔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.〕 Today the number of deaths, at any age, reported to the Death Master File is around 95 percent. ==Distribution== 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. 〔(【引用サイトリンク】url=http://www.ntis.gov/pdf/ssdmf-raw%20data%20form.pdf )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Death Master File」の詳細全文を読む スポンサード リンク
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