Are There Franchises For Medical Doctors (M.Ds) or Physicians ?

Yes, there are a few franchises and business opportunities that appear to be well suited (and sometimes actively marketed as) for Doctors and Physicians in the USA. A few examples would be medical lab testing services, walk in style urgent care centers, laser skin care clinics, assisted living centers, and a few other niche businesses like varicose vein treatment clinics, etc. This category is predicted to grow significantly going forward as the aging of our population increases dramatically in the next 20 years.

You can research a number of medical related opportunities here.