William J. O'Brien, MD
Surgery Physician · Aurora, IL
William J. O'Brien, MD is a surgery physician with a practice address in Aurora, Illinois, and NPI 1831101955, issued on Aug 13, 2006. Check the license (Illinois 036-092894, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- William J. O'Brien
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- 036-092894 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1221 N Highland Ave, Aurora, IL 60506
- Phone
- (630) 859-8700
- Enumerated
- Aug 13, 2006
- Record last updated
- Nov 18, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 036092894 IL
- Medicare enrollment
- Enrolled (PECOS I20050228000040); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1989
- Entity
- Type 1 · individual
Also registered at 1221 N Highland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lawrence Alberti, MDPulmonary Disease Physician1720015431
- Rovena AliajNurse Practitioner1871333120
- Seth Alper, M.D.Diagnostic Radiology Physician1689993768
- Mahmoud Amarna, MDPulmonary Disease Physician1538321518
- Jeffrey Anderson, PTPhysical Therapist1578598512
- Deborah Andras, PTPhysical Therapist1336246743
Verify William J. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-092894Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average surgery physician in 2024
118 Medicare Part D claims for 100 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D. 96 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen63 claims
- Acetaminophen-Codeine25 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Advocate Health And Hospitals CorporationAurora, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Surgery Physician providers in Illinois
There are 1,520 surgery physician records in Illinois.
Other surgery physician records in Illinois
- Douglas Aach, MDShiloh, IL1508817040
- Andrew Abadier, DOChicago, IL1124657473
- Shabirhusain Abadin, M.D.Chicago, IL1467712596
- Iftikharul Abbasy, MDOak Brook, IL1104814755
- Mahmoud Abd-El-Hafez, MDSpringfield, IL1710516943
- Samir Abdo, M.D.Eldorado, IL1578612982
- Chandrakumaran Abivarma, M.D.Park Ridge, IL1467135137
- Gerard Abood, M.DMaywood, IL1629237227
- Mohammad Abou El-Ezz, MDChicago, IL1790536746
- Gifty Abraham, M.D.Maywood, IL1881039279
Common questions
What is William J. O'Brien, MD's NPI number?
William J. O'Brien, MD's National Provider Identifier (NPI) is 1831101955, issued on Aug 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William J. O'Brien, MD located?
The NPPES record lists a practice address at 1221 N Highland Ave, Aurora, IL, 60506. Phone: (630) 859-8700. Providers update this record themselves, so call before visiting.
How can I verify William J. O'Brien, MD's license?
NPPES lists Illinois license number 036-092894, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William J. O'Brien, MD prescribe under Medicare Part D?
In 2024, William J. O'Brien, MD had 118 Medicare Part D claims for 100 beneficiaries; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.