On the tape where you see Dr.Logan use the code he clearly presses 7-2-7-6.
An then Vernon opens the medicine cabinet by pressing 8-6-8-5. Wtf?
Also wouldn't it have been a nice place for a small puzzle? I would have liked to actually find out the code on my own. Maybe add an option for Vernon or Christa helping you after 3 failed attempts or so, so that the player doesn't get frustrated if he didn't catch the right code.