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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Specialties & Research

Dr. John Willis, MD is board certified in Diagnostic Radiology.

Education & Awards

Dr. Willis graduated from Southern Illinois University, Springfield.


Dr. Willis has 6 hospital affiliations:

  • Greenville Regional Hospital 
  • Franklin Hospital 

> > > > Dr. John Willis, MD

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Additional Information
Dr. John Ryan Willis MD is a male Diagnostic Radiologist, has 13 years of experience and practices in Diagnostic Radiology.
Where does Dr. John R. Willis practice?
Dr. John Willis has 2 office locations.
Dr. John Willis practices Diagnostic Radiology near Centralia, IL.
Additional practice locations include: Mount Vernon, IL.
See Centralia Radiologists.