National Death Index (NDI) is an United States resource available to researchers from USA National Center for Health Statistics to obtain death status (regular NDI) or cause of death (NDI Plus) for deaths of USA citizens occurring within USA.
The fees for routine NDI searches consist of a $350.00 service charge plus $0.15 per user record for each year of death searched. For example, 1,000 records searched against 10 years would cost $350 + ($0.15 x 1,000 x 10) or $1,850. Fees for the NDI Plus service are slightly higher ($0.21) per record.
NDI is similar to Social Security Death Master File in terms of providing death status and date of death. However, NDI Plus service offers further information on cause of death.
The index was initially approved during Dorothy P. Rice's tenure as director.