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

Dr. Margaret Leighton McNairy, MD

Individual provider Internal Medicine Physician · NPI 1003033184

Dr. Margaret Leighton McNairy, MD is a Hospitalist in Saint Louis, Missouri. Graduated from Harvard Medical School in 2005, 21 years ago. Practices with Washington University, a 2,986-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
21
Trained at
Harvard Medical School
Licensed in
MO
In the registry since
2007
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

1 Barnes Jewish Hospital Plz Div Im Hospitalist
Saint Louis, MO 63110-1003
Phone: (314) 362-1700
Fax: (314) 362-9878
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 2025051392 (MO)
Internal Medicine Physician Taxonomy 207R00000X · Licence 2025051392 (MO)

Record details

NPI number1003033184
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 19, 2007
Last updated in NPPESDecember 29, 2025

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesINTERNAL MEDICINE
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 2005 (21 years in practice)
Group practice Washington University — 2986 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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