OH4 - Combat Zone Work Segment

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 segment

Seq#	Data Element Name	DataType	Usage	Vocabulary	Cardinality	Item #	Length	C.LEN	Flags
OH4
1	Set ID	SI	R		[1..1]	03543
2	Action Code	ID	O	0206(R) Segment Action Code(Required)	[0..1]	00816	[2..2]
3	Combat Zone Start Date	DT	R		[1..1]	03544
4	Combat Zone End Date	DT	O		[0..1]	03545
5	Entered Date	DT	O		[0..1]	03524
6	Combat Zone Unique Identifier	EI	O		[0..1]	02449

OH4-1: Set ID (SI) 03543

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.

OH4-2: Action Code (ID) 00816

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.

OH4-3: Combat Zone Start Date (DT) 03544

Definition: This field asserts when the combat zone duty began.

OH4-4: Combat Zone End Date (DT) 03545

Definition: This field asserts when the combat zone duty ended. If combat zone duty is current, Combat Zone End Date should be empty.

OH4-5: Entered Date (DT) 03524

Definition: This field records the date that the information was entered into the patient record.

OH4-6: Combat Zone Unique Identifier (EI) 02449

Definition: This field contains a value the uniquely identifies a single combat zone for a person.