3.2.19 Patient query (event code A19)

Another application determines a need for ADT data about a patient and sends a query to the ADT system. The Who Filter in the QRD can identify the patient or account number upon which the query is defined and can contain a Format Code of R (record oriented). If the query is based on Patient ID and there are data associated with multiple accounts, it is an implementation issue as to which account data should be returned. The ADT Event Type Segment, if included in the response, describes the last event for which the ADT system initiated an unsolicited update.