# Category:Value Set

**Definition: **A value set represents a uniquely identifiable set of concept representations (e.g., terms, codes), where any concept representation can be tested to determine whether or not it is a member of the value set. Value set complexity may range from a simple flat list of concept codes drawn from a single code system to an unbounded hierarchical set of possibly post-coordinated expressions drawn from multiple code systems.

**Reference Definition:** A value set represents a uniquely identifiable set of valid concept representations (e.g., terms, codes), where any concept representation can be tested to determine whether or not it is a member of the value set. Value set complexity may range from a simple flat list of concept codes drawn from a single code system, to an unbounded hierarchical set of possibly post-coordinated expressions drawn from multiple code systems. (**HL7 SAIF-IF)**
**See also:** Reference Set
**Component of:** Terminology
**Component of:** Terminology Binding

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