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The Technical Steward for the CM2 segment is Orders and Observations.

The Clinical Study Schedule Master (CM2) contains the information about the scheduled time points for study or phase-related treatment or evaluation events. The fact that a patient has data satisfying a scheduled time point is sent in the CSS segment, sequence 2. The CM2 segment describes the scheduled time points in general.

HL7 Attribute Table - CM2 - Clinical Study Schedule Master Segment

Seq#	DataElement	Description	Must Implement	Flags	Cardinality	Length	C.LEN	Vocabulary	DataType
CM2
1	01024	Set ID- CM2			[0..1]	[1..4]			SI
2	01025	Scheduled Time Point	SHALL		[1..1]				CWE
3	01026	Description of Time Point		=	[0..1]		300		ST
4	01027	Events Scheduled This Time Point	SHALL		[1..200]				CWE

Definition: This field contains a number that uniquely identifies this transaction for the purpose of adding, changing, or deleting the transaction. For those messages that permit segments to repeat, the Set ID field is used to identify the repetitions.

Definition: This field should correspond to the scheduled time point coding system in Chapter 7, section 7.8.3.1, "Study scheduled time point."

Definition: This field contains a brief explanation so recipients will understand what the time point represents.

Definition: This field contains a study-specific event. Coding systems may be developed for this field or applications may use facility-wide or standardized orders and procedures coding systems. This enables integration of procedures or events ordered for clinical trials with medical order entry systems.