I'm not sure what happened here. I may be misreading, but it sounds like nothing gets noted on the doctor's record? I wouldn't expect anything drastic to happen, but the incident should be recorded in a prominent place; online is where I think this stuff should go. Along with tort reform, doctor performance should be easily searchable by ordinary people.
The letter states that this incident will be on file for five years, and if someone else brings up a similar complaint against the doctor, they will reopen the case. That's about it. A big 'fuck you' in our face.