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

Margaret Williams Lowenstein, MD

Individual provider Addiction Medicine (Internal Medicine) Physician · NPI 1326381872

Margaret Williams Lowenstein, MD is a Hospitalist in Philadelphia, Pennsylvania. Graduated from Perelman School of Med at the University of Pennsylvania in 2013, 13 years ago. Practices with University of Penn-Medical Group, a 3,401-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
13
Trained at
Perelman School of Med at the University of Pennsylvania
Licensed in
PA
In the registry since
2013
Specialties on file
3
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

51 N 39th St Philadelphia
Philadelphia, PA 19104
Phone: (215) 662-3797
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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 MD462183 (PA)
Addiction Medicine (Internal Medicine) Physician Taxonomy 207RA0401X · Licence MD462183 (PA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD462183 (PA)

Record details

NPI number1326381872
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 3, 2013
Last updated in NPPESFebruary 20, 2023
Certification dateFebruary 16, 2023

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Medical schoolPERELMAN SCHOOL OF MED AT THE UNIVERSITY OF PENNSYLVANIA
Graduated 2013 (13 years in practice)
Group practice University Of Penn-Medical Group — 3401 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations6 on file with Medicare

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