How is this possible?

So my Psychologist and I were in session and I said why do you keep calling me DDNOS when that doesn't exist anymore? She said it doesnt. I said no. She said well let me look in the DSM. So she read it and said you are right. So you don't have DDNOS you have DID. How is it possible to be a specialist in DID in a large city and not know this?

SMH. I don't even know. This T has always sounded a bit flaky. Going on your old diagnosis which she "remembered" even though she couldn't remember any other details about you.... that's right in there by the very definition of 'flaky' in the dictionary.
Not knowing that the DSM had changed raises some alarm bells (although the DSM isn't the be all and end all of everything... yes, it's what gives the diagnostic codes, but the DSM itself is only as accurate as the overlords who oversee what goes in it... and they have been known to get it wrong (e.g. the debacle about them not including C-PTSD)). But what it does show about your "specialist" psychologist is that she isn't keeping abreast of the latest research and information, and that is worrying. Very worrying. What specialist doesn't keep up with the latest research and trends?
It doesn't make any sense. She had a DSM right there in her office and had never even looked at what the latest version said about her own speciality? As a specialist in a different field, if a new up-to-date equivalent-of-a-diagnostic-manual came out in my own area of expertise you betchya boots I would be looking up my own area on the day that I received it. I can't imagine a specialist who wouldn't.

well, OSDD exists now instead, but yeah, that's... not a good sign