I'm sorry if you're pissed off at psychiatry/psychology because of things in older manuals that no longer apply.
For the record, the current DSM-5 was published 5 years ago, not 1. The older one (DSM-4) was published in 1994. "Transgender/Transexualism" was not in DSM-4, either...though Transexualism was in the DSM-III (published in 1980). Without tracking down a copy of the IV and flipping through it, I can't comment with any certainty on other diagnoses that might have been more "round about" in their definitions, etc. If you're referring to the DSM-IV diagnosis of "Gender Identity Disorder," one of the disqualifying criteria for that diagnosis was "if the individual has a concurrent physical intersex condition..."
Does new information become known that necessitates a change in diagnostic criteria? Absolutely. That's why things get updated regularly...to reflect newer knowledge. That's kind of the point of science.