How about "Diagnostic Manual"?

Retaining the old title: "Diagnostic and Statistical Manual of Mental Disorders" gives the impression that the editors aren't paying attention to what's actually in the book. It's being produced by the American Psychiatric Association, so the troublesome reference to "mental disorders" can depart without causing confusion. Removing "Statistical" is a brave step toward clarity since the last edition with any statistical advice was published in 1968.