See, for example, the Catalogus graecorum codicum manuscriptorum, qui adservantur in inclyta serenissimi utriusque Bavarice Ducis Bibliotheca (Ingolstadt, 1602.
In fact, on his last visit to England in 1845, he distributed among Biblical students here a "Commentatio de virtutibus et vitiis utriusque codicum N.
Nanian Library under the title "Aegyptiorum codicum reliquiae Venetiis in Bibliotheca Naniana asservatae, Bononiae.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "codicum" in a variety of sentences. We hope that you will now be able to make sentences using this word.