injection of mental health medications

I continue to struggle with correct coding of injections of MH meds such as Risperdal Consta (etc). I've been referred to "J-codes" that do not seem to exist in the CPT2013 book. I've researched BOTH the 90863 and 96372 codes, and am still quite lost. I would really appreciate some clarification here?

Dec 17th, 2013 -

re: injection of mental health medications

The J codes are found in the HCPCS book.

Risperdal Consta is billed under J2794.

Double check 2014 codes as I have not received mine as yet.