This Technical Report identifies Hierarchic Designator (HD) and Entity Identifier (EI) data types across the AS 4700.X range of Standards and associated Handbooks. It investigates the harmonisation of HD and EI data types including those HD data types incorporated in other data types, such as XCN (Extended Composite ID number).This Technical Report includes tables of the HD and EI data types used in the AS 4700.X Australian implementation of HL7 V2 publications. Specific examples and, in some cases usage notes are given for each instance of HD or EI.