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3.3.1 EVN - event type segment

The EVN segment is used to communicate necessary trigger event information to receiving applications. Valid event types for all chapters are contained in HL7 table 0003 - Event type .

Figure 3-1. EVN attributes

SEQ

LEN

DT

OPT

RP/#

TBL#

ITEM#

ELEMENT NAME

1

3

ID

B


0003

00099

Event Type Code

2

26

TS

R



00100

Recorded Date/Time

3

26

TS

O



00101

Date/Time Planned Event

4

3

IS

O


0062

00102

Event Reason Code

5

60

XCN

O


0188

00103

Operator ID

6

26

TS

O



01278

Event Occurred

3.3.1.0 EVN field definitions

3.3.1.1 Event type code (ID) 00099

Definition: This field has been retained for backward compatibility only. We recommend using the second component (trigger event) of MSH-9-message type to transmit event type code information. This field contains the events corresponding to the trigger events described in this section, e.g., admission, transfer, or registration. Refer to Chapter 2, HL7 table 0003 - Event type for valid values.

3.3.1.2 Recorded Date/time (TS) 00100

Definition: Most systems will default to the system date/time when the transaction was entered, but they should also permit an override.

3.3.1.3 Date/time planned event (TS) 00101

Definition: This field contains the date/time that the event is planned. We recommend that the PV2-expected admit date and PV2-9-expected discharge date be used whenever possible.

3.3.1.4 Event reason code (IS) 00102

Definition: This field contains the reason for this event (e.g., patient request, physician order, census management, etc.). Refer to user-defined table 0062 - Event reason for suggested values.

User-defined Table 0062 - Event reason

Value

Description

01

Patient request

02

Physician order

03

Census management

3.3.1.5 Operator ID (XCN) 00103

Components: <ID number (ST)> ^<family name (ST)> ^ <given name (ST)> ^ <middle initial or name (ST)> ^ <suffix (e.g., JR or III) (ST)> ^ <prefix (e.g., DR) (ST)> ^ <degree (e.g., MD) (ST)> ^ <source table (IS)> ^<assigning authority (HD)> ^<name type code(ID)> ^<identifier check digit (ST)> ^ <code identifying the check digit scheme employed (ID)> ^ <identifier type code (IS)> ^ <assigning facility (HD)>

Subcomponents of assigning authority: <namespace ID (IS)> & <universal ID (ST)> & <universal ID type (ID)>

Subcomponents of assigning facility: <namespace ID (IS)> & <universal ID (ST)> & <universal ID type (ID)>

Definition: This field identifies the individual responsible for triggering the event. Refer to user-defined table 0188 - Operator ID for suggested values.

3.3.1.6 Event occurred (TS) 01278

Definition: This field contains the date/time that the event actually occurred. For example, on a transfer (A02), this field would contain the date/time the patient was actually transferred. On a cancellation event, this field should contain the date/time that the event being canceled occurred.

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