French to English Medical Medical: Health Care Health care system in France

I don't know if there is a US English equivalent. Here is what I found on the WWW:

"Il s'agit du médecin généraliste ou spécialiste que le patient consulte sur recommandation du médecin traitant pour un avis ponctuel ou un suivi régulier."
source: http://www.assureo.fr/definition/medecin_correspondant

So it is the doctor to whom one is referred -- I think we would usually say 'specialist' but the assureo definition states it can be a generalist or a specialist.