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.
HL7 Attribute Table - EVN - Event Type
| Base Framework | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Seq# | Data Element | Description | Flags | Implement | Cardinality | Length | C.LEN | Vocabulary | Data Type | |
 EVN | ||||||||||
  | 1 | 00099 | Event Type Code | W withdrawn Element | SHOULD NOT | |||||
| 2 | 00100 | Recorded Date/Time | SHOULD | [1..1] | DTM Date/Time | ||||
| 3 | 00101 | Date/Time Planned Event | MAY | [0..1] | DTM Date/Time | ||||
| 4 | 00102 | Event Reason Code | MAY | [0..1] | ex.:EventReason (CD) | CWE Coded with Exceptions | |||
| 5 | 00103 | Operator ID | MAY | [0..*] | ERROR: table is identifier | XCN Extended Composite ID Number and Name for Persons | |||
| 6 | 01278 | Event Occurred | MAY | [0..1] | DTM Date/Time | ||||
 | 7 | 01534 | Event Facility | MAY | [0..1] | HD Hierarchic Designator | ||||
| Seq# | Data Element | Description | Flags | Implement | Cardinality | Length | C.LEN | Vocabulary | Data Type | |
|---|---|---|---|---|---|---|---|---|---|---|
| EVN | ||||||||||
| 1 | 00099 | Event Type Code | W withdrawn Element | SHOULD NOT | |||||
| 2 | 00100 | Recorded Date/Time | SHALL | [1..1] | DTM Date/Time | ||||
| 3 | 00101 | Date/Time Planned Event | MAY | [0..1] | DTM Date/Time | ||||
| 4 | 00102 | Event Reason Code | MAY | [0..1] | ex.:EventReason (CD) hl7VS-eventReason (VS) eventReason (CS) | CWE Coded with Exceptions | |||
| 5 | 00103 | Operator ID | MAY | [0..*] | XCN Extended Composite ID Number and Name for Persons | ||||
| 6 | 01278 | Event Occurred | MAY | [0..1] | DTM Date/Time | ||||
| 7 | 01534 | Event Facility | MAY | [0..1] | HD Hierarchic Designator | ||||
| Base Framework | Base Standard Profile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seq# | Data Element | Description | Flags | Implement | Cardinality | Length | C.LEN | Vocabulary | Data Type | Implement | Vocabulary | |
| EVN | ||||||||||||
| 1 | 00099 | Event Type Code | W withdrawn Element | SHOULD NOT | SHOULD NOT | ||||||
| 2 | 00100 | Recorded Date/Time | SHOULD | [1..1] | DTM Date/Time | SHALL | |||||
| 3 | 00101 | Date/Time Planned Event | MAY | [0..1] | DTM Date/Time | MAY | |||||
| 4 | 00102 | Event Reason Code | MAY | [0..1] | ex.:EventReason (CD) | CWE Coded with Exceptions | MAY | hl7VS-eventReason (VS) eventReason (CS) | |||
| 5 | 00103 | Operator ID | MAY | [0..*] | ERROR: table is identifier | XCN Extended Composite ID Number and Name for Persons | MAY | ||||
| 6 | 01278 | Event Occurred | MAY | [0..1] | DTM Date/Time | MAY | |||||
| 7 | 01534 | Event Facility | MAY | [0..1] | HD Hierarchic Designator | MAY | |||||
| Base Framework | Base Standard Profile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seq# | Data Element | Description | Flags | Optionality | Repetition | Length | C.LEN | Table | Data Type | Optionality | Table | |
| EVN |
||||||||||||
|
1 | 00099 | Event Type Code | W | ||||||||
|
2 | 00100 | Recorded Date/Time | O | DTM Date/Time |
R | ||||||
|
3 | 00101 | Date/Time Planned Event | O | DTM Date/Time |
|||||||
|
4 | 00102 | Event Reason Code | O | CWE Coded with Exceptions |
(0062) | ||||||
|
5 | 00103 | Operator ID | O | Y | XCN Extended Composite ID Number and Name for Persons |
(0188) | |||||
|
6 | 01278 | Event Occurred | O | DTM Date/Time |
|||||||
|
7 | 01534 | Event Facility | O | HD Hierarchic Designator |
|||||||
| Seq# | Data Element | Description | Optionality | Repetition | Length | C.LEN | Table | Data Type | |
|---|---|---|---|---|---|---|---|---|---|
| EVN |
|||||||||
|
1 | 00099 | Event Type Code | W | |||||
|
2 | 00100 | Recorded Date/Time | R | DTM Date/Time |
||||
|
3 | 00101 | Date/Time Planned Event | O | DTM Date/Time |
||||
|
4 | 00102 | Event Reason Code | O | (0062) | CWE Coded with Exceptions |
|||
|
5 | 00103 | Operator ID | O | Y | (0188) | XCN Extended Composite ID Number and Name for Persons |
||
|
6 | 01278 | Event Occurred | O | DTM Date/Time |
||||
|
7 | 01534 | Event Facility | O | HD Hierarchic Designator |
||||
Attention: The EVN-1 field was retained for backward compatibilty only as of v2.5 and the detail was withdrawn and removed from the standard as of v2.7.
Definition: Most systems will default to the system date/time when the transaction was entered, but they should also permit an override.
Definition: This field contains the date/time that the event is planned. We recommend that PV2-8 - Expected Admit Date/Time, PV2-9 - Expected Discharge Date/Time or PV2-47 - Expected LOA Return date/time be used whenever possible.
Definition: This field contains the reason for this event. Refer to User-defined Table 0062 - Event Reason in Chapter 2C, Code Tables, for suggested values.
Definition: This field identifies the individual responsible for triggering the event. Refer to User-defined Table 0188 - Operator ID in Chapter 2C, Code Tables, for suggested values.
Definition: This field contains the date/time that the event actually occurred. For example, on a transfer (A02 transfer a patient), 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 cancelled occurred.
Definition: This field identifies the actual facility where the event occurred as differentiated from the sending facility (MSH-4). It would be the facility at which the Operator (EVN-5) has entered the event.
Use Case: System A is where the patient is originally registered. This registration message is sent to an MPI, System B. The MPI needs to broadcast the event of this update and would become the sending facility. This new field would allow for retention of knowledge of the originating facility where the event occurred. The MPI could be the assigning authority for the ID number as well which means that it is performing the function of assigning authority for the facility originating the event.
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