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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- Currently 4 of 4 stars
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.
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Education & Awards
Dr. Maassen graduated from Saint Louis University. He has 4 awards.
Dr. Maassen has 4 hospital affiliations:
- Des Peres Hospital
- Ssm St Joseph Hospital Of Kirkwood
Accepted Insurance Plans
Dr. Maassen accepts these health insurances in at least one office:
- United Healthcare - 14 plans
- Cigna - 10 plans
- Humana - 6 plans
- Great-West Healthcare - 1 plan
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