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HL7 August 13, 2026 3 min read
ACK — Application Acknowledgements (AA / AE / AR)
Every HL7 message expects an ACK response. AA means Application Accept, AE means Application Error, and AR means Application Reject. Understanding all three codes is essential for reliable healthcare integration.
ADT^A08 broadcasts demographic changes — address, phone, insurance, next-of-kin — to all subscribed systems, keeping the patient master index in sync across the enterprise.
ORU^R01 carries unsolicited observation results from laboratory and diagnostic systems to the ordering provider's EHR and every subscribed clinical system.
ORM^O01 places a new order — lab, radiology, or procedure — from the ordering system to the performing department. It carries clinical context, priority, and collection instructions.
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