I have no idea, it might be worth checking with a couple attorneys who specialize in healthcare to see if you have a case worth pursuing as many will at least do a quick consult to see if you have a case without charging. The legal system is setup for wealthy people and organizations though so I wouldn’t expect much without something like practicing completely outside of their area or pretending to be from another state or something more than a lapsed certification or making judgements from a kinda similar but not really the same specialty.