You should report all codes listed on your w2 exactly as they're stated. This doesn't mean you have to do anything further with the information, although you may. You can report multiple codes in this box, and they may not all be listed. There is an option for code explanation of "other, not listed above".
The reason you want to be sure it is reported just as it is listed is because the IRS also gets this information directly from the entity issuing the W2, and their computers check to be sure they match.
