i think the most politically correct way to say it would be to say that "Dr. Maguire is someone who stutters." or "has a stutter". but not to call him a stutterer. but that's only going from my general knowledge of saying someone has an illness (she has dementia) rather than defining them by it (she is demented).
i know that schools have some sort of "communication" thing listed under their technical standards. here is my school's communication portion from the handbook. if you feel like you can't communicate effectively, it might be a problem. and i'm curious, how come you're getting your med school paid for by the rehab people?
Communication Skills: Candidates and students shall be able to speak, hear, and observe patients in
order to elicit information; examine patients; describe changes in mood, activity and posture; and
perceive nonverbal communication. They must be able to communicate effectively and sensitively
with patients. Communication includes not only speech but also reading and writing. They must also
be able to communicate effectively and efficiently in oral and written form with all members of the
health care team.