I work in the health services as a qualified Doctor (although I'm not a medical practitioner).
Being a natural pedant, just to tell you all that the title "Mr" is given to a male Consultant in whatever specific specialist medical area they practice in. They don't have to be a surgeon etc.,
All medical Consultants are first qualified as medical Dr's and therefore can use that title before they are subsequently qualified as Consultants in their specialist field.
It's just one of the strange anomalies of medical titles! Freckles x