PIX - Patient Identifier Cross Reference

This transaction involves a request by the Patient Identifier Cross-reference Consumer Actor for a list of patient identifiers that correspond to a primary (definitional) patient identifier known by the consumer. The request is received by the Patient Identifier Cross-reference Manager. The Patient Identifier Cross-reference Manager immediately processes the request and returns a response in the form of a list of corresponding patient identifiers (active and inactive).


This transaction is equivalent to the Pan-Canadian HL7v3 Find Associated Identifiers interaction.

Message Type







Query by one of these primary IDs:

  1. PCR Enterprise ID (EID) aka Enterprise Client ID (ECID)
  2. Health Card Number (HCN)
  3. Corporate ID (CORPID) for corporate model hospitals
  4. Medical Record Number (MRN) for standard model hospitals


A source OID (ID Issuer) & corresponding ID value must be provided in the request.

For example, for PCR EID:

OID (ID Issuer) = 2.16.840.1.113883.3.239.20 (eHealth Ontario PCR Enterprise Identifier (EID))

ID = 123456



Based on exact matching the primary ID for a given active or inactive member record, pull the entity view for that single client.  Returns all identifiers (i.e. both active & inactive (i.e. merged, deleted)) for the given client.


Returns the following business attributes (where they exist, depending on PCR data density for the given client):

  • Ontario Health Card Number
  • Non-Ontario (Out-of-Province) Health Card Number(s)
  • Corporate ID(s)
  • Medical Record Number(s)


Sample Message

MSH|^~\&|UniqueSenderIdentifier|^2.16.840.1.113883.^ISO|^2.16.840.1.113883.3.239.2^ISO |^2.16.840.1.113883.3.239^ISO|201604141002-0500||QBP^Q23^QBP_Q21|1235421946|P^T |2.5||||||| UTF-8

QPD|IHE PIX Query|This is my PIX Query Tag|1192-571-546-CX^^^CANON&2.16.840.1.113883.4.59&ISO


ZIL|I hereby accept the service agreement here: https://innovation-lab.ca/media/1147/innovation-lab-terms-of-use.pdf