DODM 6025.18, March 13, 2019 defines a limited data set as PHI that excludes 16 of the 18 direct identifiers. A limited data set may still include the following (potentially identifying) information: admission dates, discharge dates, service dates, dates of birth, and, if applicable, age at time of death (including decedents age 90 or over). Also, five-digit zip code or any other geographic subdivision, such as state, county, city, precinct, and their equivalent geocodes (except street address) may also remain as part of a limited data set (LDS).