“Health Level Seven (HL7)’s Version 2.5 messaging standard has been endorsed by the International Organization for Standardization (ISO, Switzerland).
According to HL7, Version 2.5 enables interoperability between EHR, practice management, laboratory, dietary, pharmacy and billing systems, and facilitates communication among applications and data architectures operating in diverse-system environments.”
Article
Healthcare Informatics, 22 September 2009

