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

Individual provider Internal Medicine Physician · NPI 1427159714

Dr. Guy William Felder, MD is an Internal Medicine in Saint Louis, Missouri. Graduated from Saint Louis University School of Medicine in 1988, 38 years ago. Practices with Mercy East Ambulatory Services LLC, a 103-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
38
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

5640C Telegraph Rd
Saint Louis, MO 63129-4243
Phone: (314) 293-4413
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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 R8J13 (MO)

Record details

NPI number1427159714
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 26, 2006
Last updated in NPPESNovember 13, 2025
Certification dateNovember 13, 2025
Mailing address10433 Starhill Acres Dr, Saint Louis, MO 63128-3243

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 1988 (38 years in practice)
Group practice Mercy East Ambulatory Services Llc — 103 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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