The OH4 segment contains the date range an individual has worked in what is considered a combat or hazardous duty zone; both civilian and military.
The intent is for the segment to be allowed to repeat within a message definition to enable a combat zone history for the patient.
Examples:
A person/ may have worked in a combat zone for 2 years, followed by 3 years where there was no combat zone work, returning to combat zone work for another 2 years. This would be reflected as two Combat work segments documenting the date ranges for the 2 periods when the combat zone work occurred.
HL7 Attribute Table - OH4 - Combat Zone Work
| Base Framework | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Seq# | Data Element | Description | Flags | Implement | Cardinality | Length | C.LEN | Vocabulary | Data Type | |
 OH4 | ||||||||||
  | 1 | 03543 | Set ID | SHOULD | [1..1] | SI Sequence ID | ||||
| 2 | 00816 | Action Code | MAY | [0..1] | [2..2] | univ: SegmentActionCode (CD) hl7VS-segmentActionCode (VS) segmentAction (CS) | ID Coded Value for HL7 Defined Tables | ||
| 3 | 03544 | Combat Zone Start Date | SHOULD | [1..1] | DT Date | ||||
| 4 | 03545 | Combat Zone End Date | MAY | [0..1] | DT Date | ||||
| 5 | 03524 | Entered Date | MAY | [0..1] | DT Date | ||||
 | 6 | 02449 | Combat Zone Unique Identifier | MAY | [0..1] | EI Entity Identifier | ||||
| Seq# | Data Element | Description | Flags | Implement | Cardinality | Length | C.LEN | Vocabulary | Data Type | |
|---|---|---|---|---|---|---|---|---|---|---|
| OH4 | ||||||||||
| 1 | 03543 | Set ID | SHALL | [1..1] | SI Sequence ID | ||||
| 2 | 00816 | Action Code | MAY | [0..1] | [2..2] | univ: SegmentActionCode (CD) hl7VS-segmentActionCode (VS) segmentAction (CS) | ID Coded Value for HL7 Defined Tables | ||
| 3 | 03544 | Combat Zone Start Date | SHALL | [1..1] | DT Date | ||||
| 4 | 03545 | Combat Zone End Date | MAY | [0..1] | DT Date | ||||
| 5 | 03524 | Entered Date | MAY | [0..1] | DT Date | ||||
| 6 | 02449 | Combat Zone Unique Identifier | MAY | [0..1] | EI Entity Identifier | ||||
| Base Framework | Base Standard Profile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seq# | Data Element | Description | Flags | Implement | Cardinality | Length | C.LEN | Vocabulary | Data Type | Implement | Vocabulary | |
| OH4 | ||||||||||||
| 1 | 03543 | Set ID | SHOULD | [1..1] | SI Sequence ID | SHALL | |||||
| 2 | 00816 | Action Code | MAY | [0..1] | [2..2] | univ: SegmentActionCode (CD) hl7VS-segmentActionCode (VS) segmentAction (CS) | ID Coded Value for HL7 Defined Tables | MAY | |||
| 3 | 03544 | Combat Zone Start Date | SHOULD | [1..1] | DT Date | SHALL | |||||
| 4 | 03545 | Combat Zone End Date | MAY | [0..1] | DT Date | MAY | |||||
| 5 | 03524 | Entered Date | MAY | [0..1] | DT Date | MAY | |||||
| 6 | 02449 | Combat Zone Unique Identifier | MAY | [0..1] | EI Entity Identifier | MAY | |||||
| Base Framework | Base Standard Profile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seq# | Data Element | Description | Flags | Optionality | Repetition | Length | C.LEN | Table | Data Type | Optionality | Table | |
| OH4 |
||||||||||||
|
1 | 03543 | Set ID | O | SI Sequence ID |
R | ||||||
|
2 | 00816 | Action Code | O | [2..2] | ID Coded Value for HL7 Defined Tables |
(0206) | |||||
|
3 | 03544 | Combat Zone Start Date | O | DT Date |
R | ||||||
|
4 | 03545 | Combat Zone End Date | O | DT Date |
|||||||
|
5 | 03524 | Entered Date | O | DT Date |
|||||||
|
6 | 02449 | Combat Zone Unique Identifier | O | EI Entity Identifier |
|||||||
| Seq# | Data Element | Description | Optionality | Repetition | Length | C.LEN | Table | Data Type | |
|---|---|---|---|---|---|---|---|---|---|
| OH4 |
|||||||||
|
1 | 03543 | Set ID | R | SI Sequence ID |
||||
|
2 | 00816 | Action Code | O | [2..2] | (0206) | ID Coded Value for HL7 Defined Tables |
||
|
3 | 03544 | Combat Zone Start Date | R | DT Date |
||||
|
4 | 03545 | Combat Zone End Date | O | DT Date |
||||
|
5 | 03524 | Entered Date | O | DT Date |
||||
|
6 | 02449 | Combat Zone Unique Identifier | O | EI Entity Identifier |
||||
Definition: This field contains the sequence number used to identify the OH4 segment instances in message structures where the OH4 segment repeats. For the first occurrence of the segment, the sequence number shall be one, for the second occurrence, the sequence number shall be two, etc.
Definition: This field contains a code defining the action to be taken for this segment. It allows this segment to be sent to delete or update, for example, previously sent information. Refer to HL7 Table 0206 - Segment Action Code in Chapter 2C, Code Tables, for valid values.
Definition: This field asserts when the combat zone duty began.
Definition: This field asserts when the combat zone duty ended. If combat zone duty is current, Combat Zone End Date should be empty.
Definition: This field records the date that the information was entered into the patient record.
Definition: This field contains a value the uniquely identifies a single combat zone for a person.
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