Code values are always treated as a pair composed of which components?

Code values are always treated as a pair composed of which components?

• A. A system (URL) and a display
• B. A system (URL) and a code
• C. A code and a display
• D. A system (URL) and a version

Answer: (B)

In FHIR, a code value is identified by two pieces of information: the system and the code. The system is the terminology’s identifier (a URL like http://loinc.org or http://snomed.info/sct) that says which code set the code comes from, while the code is the specific code within that system. The display is just a human-readable label and is optional, and the version is metadata about the code system, not part of the code’s identity. Because the same code string can exist in different systems with different meanings, you need both the system and the code to uniquely identify a concept. That's why the correct pairing is the system URL and the code.

In FHIR, a code value is identified by two pieces of information: the system and the code. The system is the terminology’s identifier (a URL like http://loinc.org or http://snomed.info/sct) that says which code set the code comes from, while the code is the specific code within that system. The display is just a human-readable label and is optional, and the version is metadata about the code system, not part of the code’s identity. Because the same code string can exist in different systems with different meanings, you need both the system and the code to uniquely identify a concept. That's why the correct pairing is the system URL and the code.