Code is concerned with saftey, so there is a code issue with running Cat 6 parallel with Romex (as low voltage and high voltage cannot be run together, this is so that idiots who are messing in with wiring don't try to run 110v or 220v through low voltage wiring or equipment). Basically though they can run in the same wall but not through the same holes.
Best practice is to separate high voltage and Cat 6 by at least 12", use Electromagnetic shielded wiring, and limit parallel runs to less than 2'. That is not always possible though so if you need to get closer than 12" it should be a perpendicular run (at about a 90º angle) to the power line.
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