HL7 Version 2.5.1 Implementation Guide for Immunization Messaging, Release 1.5

Issued on October 1, 2014 by CDC, AIRA

Health Level Seven (HL7) is a nationally recognized standard for electronic data exchange between systems housing health care data. The HL7 standard is a key factor that supports this two-way exchange of information because it defines a syntax or grammar for formulating the messages that carry this information. It further describes a standard vocabulary that is used in these messages.