An Object Identifier (OID) is used to uniquely identify objects across systems. An OID is supplied along with an ID, which uniquely identifies an object within the OID's coding system. The structure of an OID provides information about what type of identification system the ID belongs to. The example shows OIDs and IDs for identifying a Dutch caretaker by their UZI number, a patient by their BSN number, and a Dutch organization by their URA number.

3. Opbouw OID structuur © 2010 Capgemini. All rights reserved. Insert "Title, Author, Date"

4. Example message 2.16.840.1.113883.2.4.6.3 = BSN so it is a patient with BSN BSN 000197245 2.16.528.1.1007.3.3 = URA so it is an dutch orgniastion with URA 00123456 2.16.528.1.1007.3.2.400416.16 = code system of a care organisation, this data is present with in there system with id 3000201