Browse Health
26 years of experience
Accepting new patients
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).

Learn more about Dr. Gary Maassen:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. Gary Maassen is Excellent. Dr. Maassen has been reviewed by 9 patients who have provided 1 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.1
Promptness 4.6
Courteous Staff 3.9
Accurate Diagnosis 4.3
Bedside Manner 4.8
Spends Time with Me 4.8
Follows Up After Visit 4.7

Specialties & Research

Dr. Gary Maassen, MD is board certified in Internal Medicine.

Education & Awards

Dr. Maassen graduated from Saint Louis University. He has 6 awards.

Patients' Choice Award (2008 - 2011)
Bridges to Excellence Recognition
Cardiac Care Recognition (2015 - 2017)
Level II
Physician Office Systems Recognition (2014 - 2016)
Level III
NCQA Diabetes Physician Recognition Program (2013 - 2016)
NCQA Heart/Stroke Recognition Program (2015 - 2018)
NCQA Physician Practice Connections - Patient Centered Medical Home (2014 - 2017)


Dr. Maassen has 4 hospital affiliations:

  • St Anthonys Medical Center 
  • Des Peres Hospital 


  • English

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Additional Information
Dr. Gary Maassen MD is a male Internist, has 26 years of experience and practices in Internal Medicine.
Where does Dr. Gary Maassen practice?
Dr. Gary Maassen has 1 office location.
Dr. Gary Maassen practices Internal Medicine near Saint Louis, MO.
See Saint Louis Internists.