Final answer:
The concept of reporting multiple codes instead of a single combination code does not align with the options provided; however it might refer to 'unbundling' in medical coding or classification contexts.
Step-by-step explanation:
When discussing the practice of reporting several codes instead of one combination code, none of the options provided—encoding, decoding, multiplexing, demultiplexing—directly describe this process in the context of assigning codes such as in medical coding or classification systems. However, if this question were from the domain of medical coding or similar classification contexts, the terminology may refer to unbundling. Unbundling is a term used where multiple codes are used to describe different aspects of a complex service that might otherwise be covered by a single comprehensive code. In other fields, particularly telecommunications and signal processing, multiplexing and demultiplexing refer to combining multiple signals into one or the reverse, respectively.