Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Marilyn A. Maxwell, MD

Individual provider Internal Medicine Physician · NPI 1144233164

Marilyn A. Maxwell, MD practises Internal Medicine in Saint Louis, Missouri. Graduated from Saint Louis University School of Medicine in 1981, 45 years ago. Practices with SSM Health Care Group, a 923-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
45
Trained at
Saint Louis University School of Medicine
Licensed in
MO
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3660 Vista Ave
Saint Louis, MO 63110-2540 Not confirmed with CMS for 17 years — call before visiting
Phone: (314) 977-6100
Fax: (314) 977-6137
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence R1D74 (MO)

Record details

NPI number1144233164
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 14, 2006
Last updated in NPPESMarch 30, 2009

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolSAINT LOUIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1981 (45 years in practice)
Group practice Ssm Health Care Group — 923 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients71
Services billed 140 a service is one billed item, such as a visit, a test or a procedure
Average patient age67

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at SSM Health Care Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 923 clinicians in the practice; 12 are shown here.

Other providers in Saint Louis