Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Margaret M O'Brien, MD

Individual provider Anesthesiology Physician · NPI 1023048964

Dr. Margaret M O'Brien, MD is an Anesthesiology in Bryn Mawr, Pennsylvania. Graduated from Icahn School of Medicine at Mount Sinai in 1990, 36 years ago. Practices with United Anesthesia Services PC, a 436-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
36
Trained at
Icahn School of Medicine at Mount Sinai
Licensed in
PA
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

130 S Bryn Mawr Ave
Bryn Mawr, PA 19010-3121
Phone: (610) 526-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence MD051635L (PA)

Record details

NPI number1023048964
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 4, 2006
Last updated in NPPESApril 22, 2019

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
Graduated 1990 (36 years in practice)
Group practice United Anesthesia Services Pc — 436 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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