De or het codecommissie?

The correct Dutch article is:

de codecommissie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use codecommissie

the codecommissiede codecommissie
this codecommissiedeze codecommissie
that codecommissiedie codecommissie
our codecommissieonze codecommissie
your codecommissiejouw codecommissie
every codecommissieelke codecommissie
which codecommissie?welke codecommissie?
a big codecommissie / the big codecommissieeen grote codecommissie, de grote codecommissie

Dutch words ending in codecommissie

reclamecodecommissie

In compound words, the last part decides the article. See the rule