Depending on what stage of the process you are approved at could effect what you receive I imagine. I believe the Fully Favorable or Partially Favorable decision always comes from an ALJ. And, even then one judge might include the diagnosis while another might not depending on how he or she writes their decisions.
Where to find the coding has been covered here before but I honestly can't recall the exact directions. Janke will know I would imagine...
Another option is to: "Call and ask for a copy of the Form SSA-831 and the DDE (Disability Determination Explanation)."
http://ssdfacts.com/forum/index.php/topic,15662.0.html
The info is also apparently listed in your disability file. So for those that have a copy you'll find in the CD. SS charges $49 if you request it after approval.