Summary

Dr. Gary Maassen is a board-certified physician specializing in internal medicine and surgery. He earned his medical degree from St. Louis University School of Medicine and completed his residency at St. Johns Medical Center. With four decades of medical practice, Dr. Maassen brings extensive experience to patient care. He is fluent in English.

Dr. Maassen practices at locations throughout Saint Louis, Missouri, and maintains hospital affiliations with OSF Healthcare Saint Anthony's Health Center. His clinical expertise includes treating respiratory conditions like asthma, including pediatric cases, and managing heart rhythm disorders such as atrial fibrillation. Patients have rated Dr. Maassen 4.6 out of 5 stars on average, reflecting their confidence in his care.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4.6
  • 40 years of experience
  • 30 insurance plans accepted
  • speaks English
  • St Johns Medical Center
  • 4 written reviews
  • 2 specialties
  • 7 areas of expertise
  • 2 board certifications
  • 1 hospital affiliation
  • 3 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. Gary Anthony Maassen has 3 locations

South County Internal Medicine

5034 Griffin RdSaint Louis, MO 63128
Mon8:00 am - 4:30 pm
Tue8:00 am - 4:30 pm
Wed8:00 am - 4:30 pm
Thu8:00 am - 4:30 pm
Fri8:00 am - 4:30 pm
SatClosed
SunClosed

Mercy Hospital South

10010 Kennerly RdSaint Louis, MO 63128

Kindred Hospital Saint Louis South

10018 Kennerly RdSaint Louis, MO 63128

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Dr. Gary Anthony Maassen, MDDr. Kelly Ann Wood, MSPH, MDEric HarkerDr. Michael Albrecht, MD
Internal MedicineInternal MedicineInternal MedicineInternal Medicine
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
4.6 
40 Years of Experience 20 Years of Experience 25 Years of Experience 14 Years of Experience
No Virtual Visit Option No Virtual Visit Option Virtual Visit Available Virtual Visit Available
Speaks English Speaks English Speaks English Speaks English
Saint Louis , MOCOLUMBIA , ILLyons , COLANSING , KS
Med School: St Louis University School Of Medicine Med School: Southern Illinois University School Of Medicine Med School: Duke University School Of Medicine Med School: University Of Kansas School Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Gary Anthony Maassen

  • Accepts Medicaid
  • AARP
  • Aetna
  • Aetna - HMO
  • Aetna - Medicare
  • Aetna - Medicare (Advantage HMO)
  • Aetna - POS
  • Anthem Blue Cross
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield - Federal Employees Program
  • CHAMPVA
  • Cigna
  • ESSENCE Healthcare
  • ESSENCE Healthcare - Medicare
  • ESSENCE Healthcare - Medicare (Advantage HMO)
  • First Health (Coventry Health Care)
  • GEHA
  • Healthlink
  • Healthlink - PPO
  • Humana
  • Medicare
  • Medicare - Medicaid
  • Medicare - Medicare
  • Meritain Health
  • UnitedHealthcare
  • UnitedHealthcare - Medicare
  • UnitedHealthcare - Medicare (Advantage HMO)
  • UnitedHealthcare - PPO
  • UnitedHealthOne
  • WPS Health Plan
  • WPS Health Plan - Medicare

Medical Specialties

Dr. Gary Anthony Maassen has the following 2 specialties

Specialty Expertise

Dr. Gary Anthony Maassen has the following 7 areas of expertise

  • Check-up
  • Heartburn
  • Immunization
  • Physical
  • Surgery
  • Vaccination
  • Weight Loss

Certifications, License, & Education

40 Years Experience

Education & Training

Residency

Completed their residency at St Johns Medical Center.

Medical School

Graduated from St Louis University School Of Medicine in 1986.

NPI Number

Dr. Maassen's NPI number is 1831170968.

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Frequently Asked Questions

Is Dr. Gary Maassen accepting new patients?
Dr. Gary Maassen is accepting new patients on Vitals. View Dr. Gary Maassen's profile on Vitals to make an appointment.
Does Dr. Gary Maassen accept my insurance?
You can see the insurance plans that Dr. Gary Maassen accepts on their Vitals profile.
What languages does Dr. Gary Maassen speak?
Dr. Gary Maassen speaks English.
Where is Dr. Gary Maassen's office located?
Dr. Gary Maassen's office is located at 5034 Griffin Rd, Saint Louis, MO, 63128.
Which hospitals is Dr. Gary Maassen affiliated with?
Dr. Gary Maassen is affiliated with Osf Healthcare Saint Anthonys Health Center.

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