NBDPN mainly facilitates most of the multistate collaborative birth defects research projects.
Another study used 2006-2010 nationwide Down syndrome data reported to NBDPN by 41 population-based birth defects surveillance programs .
Of the 41 birth defects surveillance programs in USA that reported data to NBDPN in 2013, 29% reported data from live births only, 42% reported data from live births and stillbirths, and 29% reported data from all pregnancy outcomes .
Researchers using data from 41 population-based surveillance programs that reported data to NBDPN in 2013 found a higher prevalence of Down syndrome when all pregnancy outcomes were included compared to prevalence estimates from live births only  (Table 2).
NBDPN has already translated ICD-9-CM birth defects codes to ICD-10-CM (Table 3).
Over half of the 43 USA population-based birth defects surveillance programs that report data to NBDPN use ICD9-CM to code birth defects .