Dr. Daniel C. O'Brien, MD
- Medicare services, 2024
- 375
- Medicare patients, 2024
- 99
- Part D claims, 2024
- 197
- Hospital affiliations
- 1
- Industry payments
- $157
- Practice address
- 4440 W 95th Street, Oak Lawn, IL 60453
- Practice phone
- Call (708) 684-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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. Daniel C. O'Brien is a transplant surgery physician in Oak Lawn, Illinois
Dr. O'Brien practices at Advocate Christ Medical Center in Oak Lawn, Illinois, part of Advocate Health.
Dr. O'Brien's NPI, 1548659980, was assigned on January 22, 2015. Dr. O'Brien graduated from Northwestern University Feinberg Medical School in 2016. Dr. O'Brien holds Wisconsin license 82286.
- NPI
- 1548659980NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7517259716
- NPI enumeration date
- January 22, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (708) 684-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Daniel C. O'Brien practices at Advocate Christ Medical Center in Oak Lawn, Illinois
Dr. O'Brien's primary practice is Advocate Christ Medical Center, at 4440 W 95th Street, Oak Lawn, IL 60453 in Cook County. The practice phone is (708) 684-8000.
- Advocate Christ Medical Center4440 W 95th Street, Oak Lawn, IL 60453 · Cook CountyPhone(708) 684-8000
Source: Dmand AI Affiliation Data
Dr. Daniel C. O'Brien is affiliated with 2 sites of care and 2 medical groups
Dr. O'Brien's primary practice is Advocate Christ Medical Center in Oak Lawn, Illinois, part of Advocate Health. The medical group on file is Dreyer Medical Clinic (Advocate Medical Group). Dmand AI also links Dr. O'Brien to 1 more group practice or clinic 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. Daniel C. O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Brien practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Advocate Christ Medical Center | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Advocate Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Daniel C. O'Brien is one of 47 transplant surgery physicians in Illinois
Transplant surgery is Dr. O'Brien's primary specialty in the NPI Registry, under taxonomy code 204F00000X. Dmand AI has Dr. O'Brien's licenses on file in 4 states: Wisconsin, California, Illinois and Indiana.
Specialties and state licenses
- Transplant surgery, WisconsinPrimary
- Surgery, California
- Illinois license
- Student in an organized health care education/training program, Indiana
Transplant surgery physicians near Dr. O'Brien
Counts of transplant surgery physicians 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. Daniel C. O'Brien billed Medicare for 375 services in 2024
CMS data shows 375 Medicare services from Dr. O'Brien across 7 procedure codes in 2024, for 99 Medicare patients. Medicare paid $54,486 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. O'Brien's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 572024: 232307%
- Other services
- 2023: 02024: 103
- Surgery
- 2023: 02024: 40
Dr. O'Brien compared with the Illinois median for transplant surgery physicians, 2024
- Dr. O'Brien
- Illinois median
- Medicare services
- 375vs 1392.7 times
- Medicare patients
- 99vs 7434% above
- Part D claims
- 133vs 7577% above
Medians across 42 transplant surgery physicians 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 transplant surgery physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Daniel C. O'Brien treated 99 Medicare patients in 2024, average age 60
CMS counts 99 Medicare patients who saw Dr. O'Brien in 2024. The largest group is under 65, with 59 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 37% are also on Medicaid. Their average risk score is 7.29, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. O'Brien's median patient age at 66, with 37% women.
Dr. O'Brien's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. O'Brien's Medicare patients by sex, 2024
- Women4444%
- Men5556%
Chronic conditions among Dr. O'Brien's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes67%
- Heart failure55%
- Ischemic heart disease54%
- Arthritis32%
- Mood disorders20%
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 66
Patient panel by sex, all payers
- Women37%
- Men62%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Daniel C. O'Brien wrote 197 Medicare Part D claims in 2024
In 2024, Dr. O'Brien wrote 197 Medicare Part D claims for 35 patients. 97% of them were for generic drugs. CMS names the drug for 133 of them, across 3 drugs with 11 or more claims each, at $10,918 in total drug cost. In 2018, CMS named 13 claims across 1 drug.
Dr. O'Brien's Part D claims by kind of drug, 2024
- Generic191 claims97%
- Brand-name and other6 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
- Antibiotics36%71 of 197 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, 2018 to 2024
- 2018
- 2024
- Claims for drugs CMS names
- 2018: 132024: 133923%
Drugs named by CMS: 3 in 2024, 1 in 2018.
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
How Dr. Daniel C. O'Brien takes part in Medicare
Dr. O'Brien accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Daniel C. O'Brien received $157 in industry payments from 2021 to 2022
CMS Open Payments shows 3 general payments to Dr. O'Brien from 3 drug and device companies from 2021 to 2022. Food and beverage make up the largest share, 100% of the total. Bausch Health Americas, Inc. paid the most, $101.
General payments to Dr. O'Brien by program year, 2021 to 2022
Companies that paid Dr. O'Brien the most, 2021 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Daniel C. O'Brien graduated from Northwestern University Feinberg Medical School
Dr. O'Brien graduated from Northwestern University Feinberg Medical School in 2016.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Daniel C. 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) |
| 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. Daniel C. 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. Daniel C. O'Brien's NPI number?
Dr. Daniel C. O'Brien's NPI number is 1548659980. It was assigned on January 22, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Daniel C. O'Brien?
Dr. Daniel C. O'Brien is a transplant surgery physician in Oak Lawn, Illinois. The primary specialty in the NPI Registry is Transplant Surgery Physician (taxonomy code 204F00000X).
Where does Dr. Daniel C. O'Brien practice?
Dr. O'Brien practices at 4440 W 95th Street, Oak Lawn, IL 60453. Dr. O'Brien's primary practice is Advocate Christ Medical Center in Oak Lawn, Illinois, part of Advocate Health. Dmand AI also links Dr. O'Brien to 1 group practice or clinic and 1 medical group.
What is Dr. Daniel C. O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (708) 684-8000.
What is Dr. Daniel C. O'Brien's medical license number?
Dr. O'Brien holds Wisconsin license 82286, one of the licenses on file in 4 states.
Which states has Dr. Daniel C. O'Brien been licensed in?
Dmand AI has state licenses on file for Dr. O'Brien in Wisconsin, California, Illinois and Indiana.
Which hospitals is Dr. Daniel C. O'Brien affiliated with?
Dr. O'Brien practices at Advocate Christ Medical Center in Oak Lawn, Illinois.
What medical group is Dr. Daniel C. 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. Daniel C. O'Brien accept Medicare?
Yes. CMS data shows Dr. O'Brien billed Medicare for 375 services in 2024, and Dr. O'Brien accepts Medicare assignment.
How many Medicare patients does Dr. Daniel C. O'Brien see?
CMS counts 99 Medicare patients who saw Dr. O'Brien in 2024, with an average age of 60.
Show 5 more questionsShow fewer questions
What services does Dr. Daniel C. O'Brien bill to Medicare?
In 2024, Dr. O'Brien's most billed Medicare services were office visit, established patient (99213), medicare service (G2211) and office visit, established patient (99214).
Where did Dr. Daniel C. O'Brien go to medical school?
Dr. O'Brien graduated from Northwestern University Feinberg Medical School in 2016.
What drugs does Dr. Daniel C. O'Brien prescribe most?
In 2024 Medicare Part D data, Dr. O'Brien's most prescribed drugs by claims were Sulfamethoxazole-Trimethoprim, Valganciclovir HCl and Mycophenolic Acid.
Has Dr. Daniel C. O'Brien received payments from drug or device companies?
CMS Open Payments shows $157 in general payments to Dr. O'Brien from 3 companies from 2021 to 2022. The largest total came from Bausch Health Americas, Inc.
How long has Dr. Daniel C. O'Brien been practicing?
Dr. O'Brien graduated from medical school in 2016, 10 years ago.
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