Interstellar medicine
Interstellar medicine was a branch in the field of medicine that dealt with the medical needs of multiple planets in different locations, rather than the relatively limited ones of a single planet. 

In 2270, Leonard McCoy was honored by the Dramens for "his significant achievements in the field of interstellar medicine", after discovering the cure to the Dramia II plague. ()

See also 
 Frontier medicine

Medical disciplines