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 Schaller, M.P.H., MD is board certified in Internal Medicine, Occupational Medicine, and Public Health & General Preventive Medicine.
Education & Awards
Dr. Schaller graduated from University of Arizona, Tucson.
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- Additional Information
- Where does Dr. John L. Schaller practice?
Dr. John Schaller practices Internal Medicine, Public Health & General Preventive Medicine, Occupational Medicine, and Preventive Medicine/Occupational Environmental Medicine near Phoenix, AZ.
See Phoenix Internists and Phoenix Preventive Medicine Specialists.