HL7 2.5.1 - Identifier Type Codeset - HL7 0203

# HL7 Version CodeValue Description
 1 2.5.1 BR Birth registry number
 2 2.5.1 MR Medical record number
 3 2.5.1 PI Patient internal identifier
 4 2.5.1 PN Person number
 5 2.5.1 PT Patient external identifier