Was the new code just 295 or 295.xx? The xx meaning some more numerals in the code?
Ok. The 295 group of codes refers to Schizophrenia and other related Psychotic illnesses and 300.23 refers to social phobia.
Am I right in assuming that you were originally being treated for Social Phobia? Did you doctor decide to try Geoden for it's sedative effects? You obviously had a very poor reaction to the Geoden, did your reaction include any new Psychiatric symptoms? Perhaps paranoia?
It may have been a mistake. However, it is quite common for diagnosis to change and my first thought was whether you experienced any mild psychotic symptoms (or that your paranoia became more pronounced) in reaction to the Geoden and that he had written a diagnosis of a substance induced psychotic episode. Without knowing the specific code it is hard to interpret his intentions.
It is also entirely possible that he is using a code to satisfy your insurance company! Anti-psychotics may not be covered for the treatment of Social Anxiety and perhaps he has put down one of the Psychotic codes so that the medication is covered.
Diagnostic codes are really for use with funding and he may well have reasons for changing the code. As there are numerous potential reasons for changing a code take his advice and wait to discuss it with him before becoming too concerned by what the change means.
If you have further questions or would like me to expand upon any part of my answer please let me know