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VXU^V04

HL7 v2 immunization message type, Order Entry / vaccination domain.

Definition

VXU^V04 unsolicitedly transmits a patient's vaccination history to an immunization information system (IIS). Each vaccination is carried by an RXA (Pharmacy/Treatment Administration) segment, complemented by RXR (route/site) and OBX. The PID identifies the patient and the expected response is an ACK.

Origin

Defined in Chapter 4 (Order Entry) of the HL7 Version 2.x Messaging Standard, and detailed in the HL7 Version 2.5.1 Implementation Guide for Immunization Messaging (CDC).

Example in context

MSH|^~\&|EHR|CLINIC|IIS|STATE|202606201200||VXU^V04|MSG040|P|2.5.1

  • PID — identifies the vaccinated patient.
  • OBX — carries associated observations (lot, status).

Last updated: June 20, 2026