^A11
ADT^A11 — Cancel Admit/Visit Notification
Sent to cancel a previously transmitted A01 (admit) message. It instructs downstream systems to reverse the admit event and remove the patient's active encounter.
When Is This Sent?
When an admission is entered in error and needs to be reversed. For example: a patient was admitted to the wrong MRN, or the admission was created before the actual patient arrived and the patient never showed.
Real-World Usage
Cancels are operationally critical but technically difficult. Many downstream systems are not designed to handle cancel events — they create encounters on A01 but have no workflow for removing them on A11. Before go-live, explicitly test A11 handling in all downstream systems. Systems that can't handle A11 will accumulate ghost admits over time.
Message Structure
Segment names link to their field-level reference pages.
Example Message
Realistic example with fake patient data. Paste into the HL7 Message Viewer to explore interactively.
1MSH||^~\&|EPIC|HOSPITAL_A|MIRTH_PROD|PACS|20260310145000||ADT^A11^ADT_A11|MSG00020|P|2.5.1 2EVN||A11|20260310145000 3PID||1||123456^^^HOSP_A^MR||Smith^John^M^^Mr.||19850315|M 4PV1||1|I|4A^201^1^^^HOSP_A||||1234^Ahmed^Dr.^Khalid|||MED|||||||||IP||||||||||||||||||||||||||20260310143000
Troubleshooting Scenarios
Downstream system still shows patient as admitted after A11
Cause
The downstream system doesn't process A11 events and has no mechanism to reverse an admission.
Fix
Work with the downstream system vendor to implement A11 handling. As a workaround, some interfaces convert A11 to an A03 (discharge) with a special disposition code indicating 'cancelled admission'.
Common Confusions
ADT^A11 (Cancel Admit) vs ADT^A13 (Cancel Discharge). A11 reverses an A01. A13 reverses an A03. Use the cancel that matches the original event.
Related Message Types
Segment Reference
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