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

Dr. Theodore Seth Thomas, MD

Individual provider Medical Oncology Physician · NPI 1326359837

Dr. Theodore Seth Thomas, MD is an Internal Medicine in Saint Louis, Missouri. Graduated from University of Missouri, Columbia School of Medicine in 2010, 16 years ago. Practices with Washington University Physicians in Illinois Inc, a 167-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
16
Trained at
University of Missouri, Columbia School of Medicine
Licensed in
IL
In the registry since
2010
Specialties on file
2
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

915 N Grand Blvd
Saint Louis, MO 63106-1621
Phone: (314) 652-4100
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1418 Cross St, Shiloh, IL 62269-2914 — (800) 647-2098

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 036166718 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036166718 (IL)

Record details

NPI number1326359837
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 30, 2010
Last updated in NPPESFebruary 3, 2026
Certification dateFebruary 3, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MISSOURI, COLUMBIA SCHOOL OF MEDICINE
Graduated 2010 (16 years in practice)
Group practice Washington University Physicians In Illinois Inc — 167 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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