What is the defining feature of the data type CE in HL7?

The defining feature of the data type CE (Coded Element) in HL7 is that it encompasses not just a code value, but also includes code text and coding system name. This allows for a more comprehensive representation of coded information. The code value serves to identify a concept within a specific coding system, while the code text provides a human-readable description of that code. The coding system name is essential as it specifies the context in which the code belongs, allowing for different coding schemes to be accurately referenced.

Thus, the inclusion of these three components (code value, code text, and coding system name) is critical for interoperability in healthcare data exchange, ensuring that the information can be understood regardless of the system or locale in which it is used. This multifaceted approach enhances clarity and reduces the risk of misinterpretation.