For most maladies, the treatment is some combination of pharmaceuticals, lifestyle changes, or diet changes. The latter two can be undertaken anywhere, so that leaves pharma.

Name-brand pharmaceuticals are expensive, but in almost all cases, there are less expensive options available that are almost as good. Most of these are off-patent, can be manufactured anywhere on earth, and can be acquired for pennies.

An intelligent diagnostic / treatment computer would know where the patient was located, their access to medical facilities, their access to drugs, and make a recommendation based on those qualifiers.