Dr. William J. O'Brien, MD
- Medicare services, 2024
- 706
- Medicare patients, 2024
- 517
- Part D claims, 2024
- 118
- Publications
- 1
- Hospital affiliations
- 1
- Practice address
- 1221 N Highland Ave, Aurora, IL 60506
- Practice phone
- Call (630) 264-8400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Advocate Medical Group Ambulatory Surgery Center - Aurora
Surgery Center - Medicare-Certified · Aurora, Illinois
Find Dr. O'Brien's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William J. O'Brien is a general surgeon in Aurora, Illinois
Dr. O'Brien practices at Advocate Medical Group Ambulatory Surgery Center - Aurora in Aurora, Illinois.
Dr. O'Brien's NPI, 1831101955, was assigned on August 13, 2006. Dr. O'Brien graduated from University of Wisconsin School of Medicine in 1989. Dr. O'Brien holds Illinois license 036-092894.
- NPI
- 1831101955NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3375596661
- NPI enumeration date
- August 13, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 264-8400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William J. O'Brien practices at Advocate Medical Group Ambulatory Surgery Center - Aurora in Aurora, Illinois
Dr. O'Brien's primary practice is Advocate Medical Group Ambulatory Surgery Center - Aurora, at 1221 N Highland Ave, Aurora, IL 60506. The practice phone is (630) 264-8400.
- Advocate Medical Group Ambulatory Surgery Center - Aurora1221 N Highland Ave, Aurora, IL 60506Phone(630) 264-8400
Source: Dmand AI Affiliation Data
Dr. William J. O'Brien is affiliated with 4 sites of care and 2 medical groups
Dr. O'Brien's primary practice is Advocate Medical Group Ambulatory Surgery Center - Aurora in Aurora, Illinois. Dr. O'Brien is also affiliated with Advocate Good Samaritan Hospital. The medical group on file is Dreyer Medical Clinic (Advocate Medical Group). Dmand AI also links Dr. O'Brien to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William J. O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Brien practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Advocate Medical Group Ambulatory Surgery Center - Aurora | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William J. O'Brien is one of 1,217 general surgeons in Illinois
Surgery is Dr. O'Brien's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. O'Brien is licensed in Illinois.
Specialties and state licenses
- Surgery, IllinoisPrimary
General surgeons near Dr. O'Brien
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William J. O'Brien billed Medicare for 706 services in 2024
CMS data shows 706 Medicare services from Dr. O'Brien across 15 procedure codes in 2024, for 517 Medicare patients. Medicare paid $89,201 for them.
Dr. O'Brien's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 4042024: 34914%
- Office and hospital visits
- 2023: 2192024: 2085%
- Surgery
- 2023: 972024: 13337%
- Imaging
- 2023: 02024: 16
Where Dr. O'Brien's Medicare services took place, 2024
- In an office67495%
- In a facility325%
Dr. O'Brien compared with the Illinois median for general surgeons, 2024
- Dr. O'Brien
- Illinois median
- Medicare services
- 706vs 1943.6 times
- Medicare patients
- 517vs 1443.6 times
- Part D claims
- 88vs 283.1 times
Medians across 1,031 general surgeons in Illinois with Dmand AI profiles that report each measure.
Dr. O'Brien's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. O'Brien and other general surgeons in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William J. O'Brien treated 517 Medicare patients in 2024, average age 76
CMS counts 517 Medicare patients who saw Dr. O'Brien in 2024. The largest group is 75 to 84, with 224 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 4% are also on Medicaid. Their average risk score is 1.48, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Brien's median patient age at 73, with 46% women.
Dr. O'Brien's Medicare patients by age, 2024
Dr. O'Brien's Medicare patients by sex, 2024
- Women25850%
- Men25950%
Chronic conditions among Dr. O'Brien's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Ischemic heart disease43%
- Chronic kidney disease32%
- Diabetes32%
- Atrial fibrillation26%
- Heart failure24%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Brien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William J. O'Brien wrote 118 Medicare Part D claims in 2024
In 2024, Dr. O'Brien wrote 118 Medicare Part D claims for 100 patients. 97% of them were for generic drugs. CMS names the drug for 88 of them, across 2 drugs with 11 or more claims each, at $235 in total drug cost. In 2023, CMS named 71 claims across 2 drugs.
Dr. O'Brien's Part D claims by kind of drug, 2024
- Generic114 claims97%
- Brand-name and other4 claims3%
Dr. O'Brien's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. O'Brien's Part D claims, 2024
- Opioids81%96 of 118 claims
- Antibiotics9%11 of 118 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 712024: 8824%
Drugs named by CMS: 2 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. William J. O'Brien ranks in the 94th percentile for hernia repair - groin (open) in Medicare
Dr. O'Brien accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 15 procedures of hernia repair - groin (open) by Dr. O'Brien, more than 94% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. O'Brien ranks in Medicare procedure volume
- Melanoma (skin cancer) excision
- 90th percentile72 procedures
- Hernia repair - groin (open)
- 94th percentile15 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Hernia repair (minimally invasive): 1 to 10 procedures (CMS shows small counts as a range)
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Varicose vein removal: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. William J. O'Brien has 1 publication on record
Dmand AI links 1 paper to Dr. O'Brien in 2023. Dr. O'Brien's most frequent co-authors are Tim Nico Beck, MD, PhD and Talia Burneikis, MD.
Dr. O'Brien's most frequent co-authors
Recent publications by Dr. O'Brien
See who Dr. O'Brien researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. O'Brien works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William J. O'Brien received $185 in industry payments from 2016 to 2023
CMS Open Payments shows 4 general payments to Dr. O'Brien from 3 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 100% of the total. Ossio Inc paid the most, $149.
General payments to Dr. O'Brien by program year, 2016 to 2023
Companies that paid Dr. O'Brien the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William J. O'Brien graduated from University of Wisconsin School of Medicine
Dr. O'Brien graduated from University of Wisconsin School of Medicine in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William J. O'Brien's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William J. O'Brien
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William J. O'Brien's NPI number?
Dr. William J. O'Brien's NPI number is 1831101955. It was assigned on August 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William J. O'Brien?
Dr. William J. O'Brien is a general surgeon in Aurora, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. William J. O'Brien practice?
Dr. O'Brien practices at 1221 N Highland Ave, Aurora, IL 60506. Dr. O'Brien's primary practice is Advocate Medical Group Ambulatory Surgery Center - Aurora in Aurora, Illinois. Dmand AI also links Dr. O'Brien to 2 group practices and clinics and 1 medical group.
What is Dr. William J. O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (630) 264-8400.
What is Dr. William J. O'Brien's medical license number?
Dr. O'Brien holds Illinois license 036-092894.
Which hospitals is Dr. William J. O'Brien affiliated with?
Dr. O'Brien is affiliated with Advocate Good Samaritan Hospital.
What medical group is Dr. William J. O'Brien part of?
Dr. O'Brien is linked to Dreyer Medical Clinic (Advocate Medical Group). Dmand AI links Dr. O'Brien to 1 more medical group.
Does Dr. William J. O'Brien accept Medicare?
Yes. CMS data shows Dr. O'Brien billed Medicare for 706 services in 2024, and Dr. O'Brien accepts Medicare assignment.
How many Medicare patients does Dr. William J. O'Brien see?
CMS counts 517 Medicare patients who saw Dr. O'Brien in 2024, with an average age of 76.
What services does Dr. William J. O'Brien bill to Medicare?
In 2024, Dr. O'Brien's most billed Medicare services were blood vessel study (93880), office visit, new patient (99203) and blood vessel study (93970).
Show 6 more questionsShow fewer questions
Where did Dr. William J. O'Brien go to medical school?
Dr. O'Brien graduated from University of Wisconsin School of Medicine in 1989.
What drugs does Dr. William J. O'Brien prescribe most?
In 2024 Medicare Part D data, Dr. O'Brien's most prescribed drugs by claims were Hydrocodone-Acetaminophen and Acetaminophen-Codeine.
Has Dr. William J. O'Brien received payments from drug or device companies?
CMS Open Payments shows $185 in general payments to Dr. O'Brien from 3 companies from 2016 to 2023. The largest total came from Ossio Inc.
How long has Dr. William J. O'Brien been practicing?
Dr. O'Brien graduated from medical school in 1989, 37 years ago.
Does Dr. William J. O'Brien do research?
Dmand AI links 1 publication to Dr. O'Brien.
Who does Dr. William J. O'Brien publish with?
Dr. O'Brien's most frequent co-authors are Tim Nico Beck, MD, PhD (1 shared paper) and Talia Burneikis, MD (1 shared paper).
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