Margaret M. O'Brien, MD
NPI 1023048964ActiveIndividual· Anesthesiology· Bryn Mawr, PA
Anesthesiology (MD) in Bryn Mawr, Pennsylvania, trained at Icahn School of Medicine at Mount Sinai (class of 1990). Medicare paid $37,857 for services to 290 patients in 2024. Galderma Laboratories, L.P. was the largest of 2 companies reporting payments in 2025, $160.61 in all, mostly food and beverage.
Overview
| NPI | 1023048964 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 4, 2006 |
| Last updated in NPPES | Apr 22, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Anesthesiology Primary | 207L00000X | MD051635L | PA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Anesthesiology (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 290 |
|---|---|
| Services billed | 315 across 50 procedure codes |
| Paid by Medicare | $37,857 |
Education and affiliations
| Medical school | Icahn School of Medicine at Mount Sinai |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Anesthesiology |
Medical group
- United Anesthesia Services PCWynewood, PA · 442 clinicians
Hospital affiliation
- Bryn Mawr HospitalBryn Mawr, PA
Industry payments (Open Payments)
- 2025$160.61 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Galderma Laboratories, L.P. | $127.03 | 1 |
| Becton, Dickinson and Company | $33.58 | 1 |
What the 2025 payments were for
- Food and Beverage$160.61 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 25 anesthesiologists in Bryn Mawr · All anesthesiologists in Pennsylvania