Application Identifier (GS1)

An Application Identifier (GS1) (AI) is a 2,3 or 4 digit number, that indicates the meaning (or status) of the data, which immediately follows the Application Identifier (GS1). It is only used with GS1 data carriers, such as GS1-128 and CS1 DataMatrix bar codes.

An Application Identifier (GS1) identifies the type of data used for the purposes of Automatic Identification and Data Capture using GS1 standards.

A set of national (2 digit) numbers are issued for use in the NHS. These are:

91Hospital Identifiers.
Identifies that the data immediately following the Application Identifier relates to local hospital identifiers, typically ORGANISATION CODE (CODE OF PROVIDER), PATIENT hospital/Patient Administration System (PAS) number and the ORGANISATION GS1 Unique Organisation Prefix.
92Baby Details.
Identifies that the data immediately following the Application Identifier relates to baby details, typically NUMBER OF BABIES IDENTIFIER (PATIENT IDENTIFICATION), PERSON FAMILY NAME (MOTHER OF BABY) and PERSON GIVEN NAME (MOTHER OF BABY)
93Patient Descriptive Data.
Identifies that the data immediately following the Application Identifier relates to PATIENT descriptive data, typically PERSON FAMILY NAME, PERSON GIVEN NAME, DATE OF BIRTH (PATIENT IDENTIFICATION) and TIME OF BIRTH (PATIENT IDENTIFICATION).

Notes:
Codes 94-97 have been reserved for national use only, and are not to be allocated by the NHS locally. Codes 98 and 99 can be allocated by the NHS for local use. 

This supporting information is also known by these names:
ContextAlias
shortnameAI
alsoknownasApplication Identifier
pluralApplication Identifiers (GS1)