Users of Access Medicine have the differential diagnosis tool, Diagnosaurus, at their disposal. It can be located in Access Medicine from any page by clicking "DDX" in the dark blue, hyperlinked row of sections along the top.

Diagnosaurus links directly back into AccessMedicine to provide information about more than a thousand common diseases and disorders. Diagnosaurus (2.0) is derived from McGraw-Hill's 2007 CURRENT Consult: Medicine.