Since the T2D diagnosis I have made a point to remind various doctors, during appointments, that I have diabetes. It is of course already in their records (all of the doctors work for the same huge hospital system here in America so have access to the same records).
The reaction has ranged from what appears to be total unconcern (for instance when I was in A&E for a kidney stone episode; and when I had a routine colonoscopy) to seriously "taking it on board" because it actually mattered in context.
Those who reacted with concern: The eye doctor who then checked for retinopathy, the kidney specialist who wanted to see whether I had a diabetic-specific kidney stone called a "uric acid stone," my dentist whom I've been seeing for more than 10 years but stressed that tooth/gum care was especially important for diabetics, the dermatologist who mentioned a possible effect of steroids on BG, and so forth.
Whether they would have "remembered" or "checked" for diabetes without my reminding them, I have no idea.