Medical thrillers come in all genres!  If you like Dean Koontz and Michael Chrichton, give these books a try:

• • Bones of Betrayal by Jefferson Bass        
  • Darwin's Radio by Greg Bear
  • Vitals by Greg Bear
  • Mephisto Club by Tess Gerritsen
  • The Fifth Vial by Michael Palmer
  • 206 Bones by Kathy Reichs