This issue comes up periodically with claims of diagnostic proliferation and attempts to discredit the diagnostic systems in the DSM. The numbers that are quoted vary considerably and there are no explicit rules that I can find for how the diagnoses are counted. I finally decided to count them myself today in the DSM-5. I don't have a DSM-5 TR. As a backdrop, here is a list of the DSMs and the total diagnoses and pages.
