National Death Index
National Death Index (NDI) is a United States resource available to researchers from the US National Center for Health Statistics to obtain death status (regular NDI) or cause of death (NDI Plus) for deaths of citizens occurring within the US. 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.