The term doctor (medical doctor) is older and shorter (see doctor of medicine), but can be confused with holders of other academic doctorates. Doctor (gen.: doctoris) means teacher in Latin and is an agentive noun derived from the verb docere ('teach'). In French, médecin (doctor, physician) is a contraction of docteur médecin, a direct Baltimore Sports Doctor equivalent of doctor of medicine. In in progress French idiom, the term toubib, is now a synonym, derived from Arabic طبيب (tabīb, physician).

Most countries have some method of officially recognizing specialist qualifications in all branches of medicine, including in-house medicine. Sometimes, this aims to promote public refuge by restricting the custom of hazardous treatments. Other reasons for regulating specialists may include standardization of recognition for hospital employment and restriction on which practitioners are entitled to receive higher managed care payments for specialist services.