Doctors and therapists use the DSM-IV codes to describe the features of specific mental disorders and distinguish them from similar afflictions. These codes allow information to be relayed between doctors and therapists both concisely and precisely, and helps avoid misunderstandings and errors.

The DSM IV Diagnostic manual was first published in 1994. The DSM IV - TR is a text revision published in 2000. So the most current edition is indeed the DSM IV - TR. The DSM V is due in 2012 and may be very different from the current style.

See http://www.psych.org/mainmenu/research/dsmiv/dsmivtr.aspx for more info.

The DSM-IV is written and revised by the American Psychiatric Association.

The DSM-IV has around 900 pages in total.

Schizophrenia

PTSD

Depression

GAD