Which data type is specifically used for transmitting coded values from HL7-defined tables?

The data type that is specifically designed for transmitting coded values from HL7-defined tables is the Code (CE) data type.

This type is structured to include a code, its corresponding text, and the coding system that the code belongs to. The use of CE allows for a richer representation of coded values than simply conveying a raw code or identifier. It enhances the interoperability of health information systems by providing not only the coded value but also additional context about that code, ensuring that the receiving system can interpret the value accurately.

The other data types mentioned have different purposes: the HD (Hierarchically-Defined Data Type) is used for hierarchical information, such as identifiers for organizations or facilities. The ID (Identifier Data Type) is usually employed for simple identifiers without additional information about the code system. The IS (Coded Element Data Type) is designed for coded values that do not have the same level of detail as CE, meaning it lacks the structured support for code systems that CE provides.

In summary, CE data type is the appropriate choice for transmitting coded values from HL7-defined tables because it encompasses the necessary components to ensure clarity and consistency in data exchange.