EU resident here. I am reasonably sure that your doctor has access to your medical records when you hand them your smartcard, regardless of which doctor(s) previously updated said records.
In one country, I visit any doctor and they have my full medical history, despite not living there.
In another country, every time I visit the same doctor, they somehow don't have any files for me and I have to sign up as a new patient, despite being born and resident there.
It's all shambles, but in both cases, I get healthcare for free so it could be a lot worse.
I think it's non-ideal, but the health insurance should never need to know whether you're using your CPAP. They should only know if the doctor prescribed it.
Information should be shared with the pharmacy and other doctors. That would be helpful and would save lives.
[1] https://ds.ccc.de/download.html (german)