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The death was not reported to the Social Security Administration (SSA).
The death occurred before the Death Master File was maintained in a computer database. About 98 percent of the deaths in this database occurred between 1962 and the present.
The person did not participate in the Social Security program.
Survivor death benefits were (are) being paid to dependents or spouse.
A recent death may not be indexed yet.
Human error. (Before you give up, read the section titled "Missing Entries in the SSDI.")