Dr. Daniel Eric O'Brien, MD
- Medicare services, 2024
- 213
- Medicare patients, 2024
- 213
- Part D claims, 2024
- 180
- Hospital affiliations
- 3
- Industry payments
- $20
- Practice address
- 403 E 1st St, Dixon, IL 61021
- Practice phone
- Call (815) 288-5531
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Katherine Shaw Bethea Hospital
Dixon, 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. Daniel Eric O'Brien is an internist in Dixon, Illinois
Dr. O'Brien practices at Katherine Shaw Bethea Hospital in Dixon, Illinois.
Dr. O'Brien's NPI, 1275741829, was assigned on May 18, 2007. Dr. O'Brien graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 2006. Dr. O'Brien holds Illinois license 036121512.
- NPI
- 1275741829NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6608929435
- NPI enumeration date
- May 18, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (815) 288-5531
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Daniel Eric O'Brien practices at Katherine Shaw Bethea Hospital in Dixon, Illinois
Dr. O'Brien's primary practice is Katherine Shaw Bethea Hospital, at 403 E 1st St, Dixon, IL 61021 in Lee County. The practice phone is (815) 288-5531.
- Katherine Shaw Bethea Hospital403 E 1st St, Dixon, IL 61021 · Lee CountyPhone(815) 288-5531
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Daniel Eric O'Brien is affiliated with 5 sites of care and 8 medical groups
Dr. O'Brien's primary practice is Katherine Shaw Bethea Hospital in Dixon, Illinois. Dr. O'Brien is also affiliated with OSF Saint Katharine Medical Center. The medical group on file is OSF Multi-Specialty Group. Dmand AI also links Dr. O'Brien to 2 more hospitals, 7 medical groups and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Daniel Eric 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 |
|---|---|
| Katherine Shaw Bethea Hospital | Available with a free account |
| +4 more sites and 7 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Daniel Eric O'Brien is one of 5,652 internists in Illinois
Internal medicine is Dr. O'Brien's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. O'Brien is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. O'Brien
Counts of internists 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 Eric O'Brien billed Medicare for 213 services in 2024
CMS data shows 213 Medicare services from Dr. O'Brien across 3 procedure codes in 2024, for 213 Medicare patients. Medicare paid $26,603 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: 1332024: 21360%
Dr. O'Brien compared with the Illinois median for internists, 2024
- Dr. O'Brien
- Illinois median
- Medicare services
- 213vs 56662% below
- Medicare patients
- 213vs 208Close to median
- Part D claims
- 91vs 28468% below
Medians across 5,192 internists 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 internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Daniel Eric O'Brien treated 213 Medicare patients in 2024, average age 72
CMS counts 213 Medicare patients who saw Dr. O'Brien in 2024. The largest group is 75 to 84, with 73 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 50% are also on Medicaid. Their average risk score is 2.17, 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 53, with 55% women.
Dr. O'Brien's Medicare patients by age, 2024
Dr. O'Brien's Medicare patients by sex, 2024
- Women11654%
- Men9746%
Chronic conditions among Dr. O'Brien's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- Ischemic heart disease48%
- Anxiety44%
- Mood disorders44%
- Diabetes43%
- Heart failure43%
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 53
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Daniel Eric O'Brien wrote 180 Medicare Part D claims in 2024
In 2024, Dr. O'Brien wrote 180 Medicare Part D claims for 129 patients. 91% of them were for generic drugs. CMS names the drug for 91 of them, across 5 drugs with 11 or more claims each, at $580 in total drug cost. In 2023, CMS named 49 claims across 3 drugs.
Dr. O'Brien's Part D claims by kind of drug, 2024
- Generic164 claims91%
- Brand-name16 claims9%
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
- Opioids7%13 of 180 claims
- Antibiotics47%85 of 180 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: 492024: 9186%
Drugs named by CMS: 5 in 2024, 3 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
How Dr. Daniel Eric 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 Eric O'Brien received $20 in industry payments in 2020
CMS Open Payments shows 1 general payment to Dr. O'Brien from 1 drug or device company in 2020. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $20.
Companies that paid Dr. O'Brien the most, 2020 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Daniel Eric O'Brien graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb)
Dr. O'Brien graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 2006.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Daniel Eric 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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 Eric 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 Eric O'Brien's NPI number?
Dr. Daniel Eric O'Brien's NPI number is 1275741829. It was assigned on May 18, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Daniel Eric O'Brien?
Dr. Daniel Eric O'Brien is an internist in Dixon, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Daniel Eric O'Brien practice?
Dr. O'Brien practices at 403 E 1st St, Dixon, IL 61021. Dr. O'Brien's primary practice is Katherine Shaw Bethea Hospital in Dixon, Illinois. Dmand AI also links Dr. O'Brien to 2 hospitals, 7 medical groups and 1 group practice or clinic.
What is Dr. Daniel Eric O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (815) 288-5531.
What is Dr. Daniel Eric O'Brien's medical license number?
Dr. O'Brien holds Illinois license 036121512.
Which hospitals is Dr. Daniel Eric O'Brien affiliated with?
Dr. O'Brien is affiliated with OSF Saint Katharine Medical Center. Dmand AI links Dr. O'Brien to 2 more hospitals.
What medical group is Dr. Daniel Eric O'Brien part of?
Dr. O'Brien is linked to OSF Multi-Specialty Group. Dmand AI links Dr. O'Brien to 7 more medical groups.
Does Dr. Daniel Eric O'Brien accept Medicare?
Yes. CMS data shows Dr. O'Brien billed Medicare for 213 services in 2024, and Dr. O'Brien accepts Medicare assignment.
How many Medicare patients does Dr. Daniel Eric O'Brien see?
CMS counts 213 Medicare patients who saw Dr. O'Brien in 2024, with an average age of 72.
What services does Dr. Daniel Eric O'Brien bill to Medicare?
In 2024, Dr. O'Brien's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and critical care (99291).
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Where did Dr. Daniel Eric O'Brien go to medical school?
Dr. O'Brien graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 2006.
What drugs does Dr. Daniel Eric O'Brien prescribe most?
In 2024 Medicare Part D data, Dr. O'Brien's most prescribed drugs by claims were Prednisone, Nitrofurantoin Mono-Macro and Azithromycin.
Has Dr. Daniel Eric O'Brien received payments from drug or device companies?
CMS Open Payments shows $20 in general payments to Dr. O'Brien from 1 company from 2020 to 2020. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Daniel Eric O'Brien been practicing?
Dr. O'Brien graduated from medical school in 2006, 20 years ago.
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