I don't know exactly but DSM-4-TR probably lists a few thousand diagnoses, many overlapping.
The Diagnostic and Statistical Manual of Mental Disorders (DSM) is a widely used classification system for mental health disorders. It provides criteria for diagnosing mental illnesses and helps in standardizing diagnoses among mental health professionals. The DSM is regularly updated to reflect advances in our understanding of mental health.
Axis I of the DSM classification system includes clinical disorders, such as mood disorders, anxiety disorders, schizophrenia, and substance use disorders. These are considered the primary mental health diagnoses for individuals seeking treatment.
The DSM-IV and DSM-V are both classification systems used to diagnose mental health disorders. One key difference is that the DSM-V includes dimensional assessments for some disorders, while the DSM-IV relied solely on categorical diagnoses. Another difference is the structure of the two manuals, with the DSM-V organizing disorders based on shared features and etiology, while the DSM-IV used a multiaxial system.
Personality Disorder
It depends on who is doing the "qualifying", but the DSM-IV is generally accepted as the Standard for US doctors making mental health diagnoses. http://www.clevelandclinicmeded.com/medicalpubs/diseasemanagement/psychiatry/anxiety/anxiety.htm
DSM-V
Munchausen Syndrome is not recognized in the DSM-IV. It is a problem but is not recognized as a diagnosable mental illness.
DSM-4 WAS PUBLISHED IN 1994
I don't see it in the DSM II published in 1968. It is in the DSM III published in 1980.
The singular form of diagnoses is diagnosis.
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.