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).
Learn more about Dr. Gary Maassen:
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The overall average patient rating of Dr. Gary Maassen is Excellent.
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Specialties & Research
Dr. Gary Maassen, MD is board certified in Internal Medicine.
Education & Awards
Dr. Maassen graduated from Saint Louis University. He has 5 awards.
Dr. Maassen has 4 hospital affiliations:
- St Anthonys Medical Center
- Des Peres Hospital
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- Additional Information
- Dr. Gary Maassen MD is a male Internist, has 25 years of experience and practices in Internal Medicine.
- Where does Dr. Gary Maassen practice?
- Dr. Gary Maassen has 2 office locations.
Dr. Gary Maassen practices Internal Medicine near Saint Louis, MO.
See Saint Louis Internists.