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

Individual provider Otolaryngology Physician · NPI 1861417156

Robert Riordan Mac Donald, MD is an Otolaryngology in Saint Peters, Missouri. Graduated from Washington University School of Medicine in 1989, 37 years ago. Practices with Midwest ENT Centre, PC, a 12-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
37
Trained at
Washington 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

4790 Executive Centre Pkwy
Saint Peters, MO 63376-1606
Phone: (636) 441-3100
Fax: (636) 441-6784
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Otolaryngology Physician (primary) Taxonomy 207Y00000X · Licence MO103596 (MO)

Record details

NPI number1861417156
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 13, 2006
Last updated in NPPESApril 11, 2012

Medicare enrollment

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

Medicare specialtyOTOLARYNGOLOGY
Also practisesALLERGY/IMMUNOLOGY
Medical schoolWASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 1989 (37 years in practice)
Group practice Midwest Ent Centre, Pc — 12 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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