OMC - Supporting Clinical Information Segment

The Technical Steward for the OMC segment is Orders and Observations.

HL7 Attribute Table - OMC - Supporting Clinical Information Segment

Seq#	Data Element Name	DataType	Usage	Vocabulary	Cardinality	Item #	Length	C.LEN	Flags
OMC
1	Sequence Number - Test/Observation Master File	NM	O		[0..1]	00586		4	#
2	Segment Action Code	ID	C	0206(R) Segment Action Code(Required)		00763	[1..1]
3	Segment Unique Key	EI	C			00764
4	Clinical Information Request	CWE	R	0664	[1..1]	03444
5	Collection Event/Process Step	CWE	R	0938(R) Collection Event/Process Step Limit(Required)	[1..*]	03445
6	Communication Location	CWE	R	0939(R) Communication Location(Required)	[1..1]	03446
7	Answer Required	ID	O	0136(R) Yes/no Indicator(Required)	[0..1]	03447
8	Hint/Help Text	ST	O		[0..1]	03448
9	Type of Answer	ID	O	0125(R) Value Type(Required)	[0..1]	03449
10	Multiple Answers Allowed	ID	O	0136(R) Yes/no Indicator(Required)	[0..1]	03450
11	Answer Choices	CWE	O	0665	[0..*]	03451
12	Character Limit	NM	O		[0..1]	03452
13	Number of Decimals	NM	O		[0..1]	03453

OMC-1: Sequence Number - Test/Observation Master File (NM) 00586

Definition: This field contains the same value as the sequence number of the associated OM1 segment.

OMC-2: Segment Action Code (ID) 00763

Definition:  This field indicates whether this repetition of the segment is being added, changed or deleted.  When using dynamic update mode (See Chapter 2, Section 2.23.4.2, "Action code/unique identifier mode update definition.")  OMC-2 and OMC-3 Segment Unique Key are used to establish the "unique key" and to determine the data subject to the action. Refer to HL7 Table 0206 – Segment action code for valid values.

If the transaction uses dynamic/action code messaging, the field must be valued. 

Condition Predicate: Required if OMC-3 is valued.

OMC-3: Segment Unique Key (EI) 00764

Definition: This field contains a unique identifier for one of the multiple repetitions of this segment, to be used in conjunction with the preceding field. Each of the repetitions of the segment will be uniquely identified by this unique key field for the purposes of updates.

Condition Predicate: Required if OMC-2 is valued.

OMC-4: Clinical Information Request (CWE) 03444

Definition: This field contains a variable that the diagnostic service needs to interpret the results of an ordered study. Where the observations specified here should be sent is specified in the OMC-6 (Communication Location). Refer to Table 0664 - Clinical Information Request in Chapter 2C for valid values.

OMC-5: Collection Event/Process Step (CWE) 03445

Definition: This field indicates by when in the ordering process or workflow this information must be collected. Limit indicates must be done by X point in the workflow. Refer to HL7 Table 0938 – Collection Even/Process Step Limit for valid values.

OMC-6: Communication Location (CWE) 03446

Definition: This field indicates where in the message this information is expected to be communicated, e.g. PID, OBR, and SPM). Refer to HL7 Table 0939 – Communication Loction for valid values.

OMC-7: Answer Required (ID) 03447

Definition: Must the question be answered, or just displayed and can be blank. Refer to HL7 Table 0136 – Yes/no Indicator for valid values.

Y    Answer must be provided

N    Answer not required

OMC-8: Hint/Help Text (ST) 03448

Definition: This field gives guidance to the provider on how to answer the question.

OMC-9: Type of Answer (ID) 03449

Definition: This field contains the allowed datatype for answers, and is drawn from HL7 Table 0125 – Value Type for valid values. Type of answers include: numeric, date, coded, text, etc.

OMC-10: Multiple Answers Allowed (ID) 03450

Definition: This field indicates if multiple answers are allowed, which may impact EHR system display and selection functionality. Refer to HL7 Table 0136 – Yes/no Indicator for valid values.

Y    Multiple Answers Allowed

N    Single Answer only Allowed

OMC-11: Answer Choices (CWE) 03451

Definition: Allowed coded answers to be sent in HL7 file (CWE.1) and/or display Text for Ordering system to present to provider (CWE.2). Refer to Table 0665 - Answer Choices in Chapter 2C for valid values.

The condition is valued only if OMC-9 is valued 'CWE' or 'CNE'.

OMC-12: Character Limit (NM) 03452

Definition: Total number of characters allowed. Required for numeric and (long) text answers.

The field is valued only if OMC-9 is valued 'NM', 'SN', 'ST", 'TX', or 'FT'.

OMC-13: Number of Decimals (NM) 03453

Definition: For numeric answers the number of digits after the decimal.

The field is valued only if OMC-9 is valued 'NM' or 'SN'.