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ADT-A01 Admit/Visit Notification (HL7 v2.7)

ADT-A01 (Admit/Visit Notification) announces a patient admission or the start of a visit. The message is ADT with trigger event A01; the core segment sequence is MSH, EVN, PID, PV1.

Trigger eventA01
Message typeADT
MeaningAdmit/Visit Notification
Core segmentsMSH, EVN, PID, PV1
HL7 version2.7

Example

A live, engine-generated example lands here with the phase-1 data export.

Validation context

Strict and compatibility validation notes land here with the phase-1 data export.

This answer, in your terminal

pidgeon lookup ADT^A01 --version 2.7

Wire it into your AI agent:

claude mcp add pidgeon -- npx -y @pidgeonhealth/mcp

Download Post free to browse this reference with generation attached.

HL7® Version 2.7 © Health Level Seven International. All rights reserved.

HL7® and FHIR® are registered trademarks of Health Level Seven International.

Published by Pattern Engine LLC (Pidgeon Health).

Rendered from the same machine-readable definitions the Pidgeon engine validates against. Phase-0 sample fixture, hand-authored structural placeholder. Phase 1 replaces it with the engine's exported dataset.