William J. O'Brien, MD
NPI 1831101955ActiveIndividual· Surgery· Aurora, IL
Surgery (MD) in Aurora, Illinois, trained at University of Wisconsin School of Medicine (class of 1989). 517 Medicare patients in 2024, $117,667 paid; nearly all of their 118 Part D prescriptions were generic (97%).
Overview
| NPI | 1831101955 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 13, 2006 |
| Last updated in NPPES | Nov 18, 2021 |
| Certified by provider | Nov 18, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 036-092894 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - General Surgery (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 517 |
|---|---|
| Services billed | 853 across 70 procedure codes |
| Paid by Medicare | $117,667 |
Part D prescriptions in 2024
| Prescriptions (claims) | 118 · 118 30-day fills |
|---|---|
| Patients | 100 |
| Total drug cost | $547.66 |
| Generic share | 97% of claims |
Education and affiliations
| Medical school | University of Wisconsin School of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | General Surgery |
Medical group
- Advocate Health and Hospitals CorporationChicago, IL · 3,118 clinicians
Hospital affiliation
- Advocate Good Samaritan HospitalDowners Grove, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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