To identify a party by type of organization, name and code
Entity Identifier Code
Code identifying an organizational entity, a physical location, or an individual
R0203: At least one of N1-02 or N1-03 is required
Identification Code Qualifier
Code designating the system/method of code structure used for Identification Code (67).
P0304: If either N1-03 or N1-04 is present, then the other is required
Code identifying a party or other code.
This segment, used alone, provides the most efficient method of providing organizational identification. To obtain this efficiency the "ID Code" (N104) must provide a key to the table maintained by the transaction processing party.