Seems to me that the physician needs a talking-to, by the State Medical Board if necessary, if s/he believes that. You might let your displeasure with such idiocy be known, first to the doctor and then higher up if necessary.

...damned fools who think that "MD" means "Mighty Deity"...grumble grumble...seen it elsewhere and too often...only the pathologists make the right diagnosis...grumble grumble....