Dr. John M. O'Brien, MD
- Medicare services, 2023
- 96
- Part D claims, 2024
- 324
- MIPS score, 2024
- 95
- Hospital affiliations
- 1
- Medical group
- 1
- Practice address
- 1901 W Harrison St, Chicago, IL 60612
- Practice phone
- Call (312) 864-6000
- 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. John M. O'Brien is an internist in Chicago, Illinois
Dr. O'Brien practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government.
Dr. O'Brien's NPI, 1376572891, was assigned on June 30, 2006. Dr. O'Brien graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1988. Dr. O'Brien holds Illinois license 036082069.
- NPI
- 1376572891NPI Registry (opens in a new tab)
- NPI enumeration date
- June 30, 2006
- NPI status
- Active
- Practice phone
- (312) 864-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John M. O'Brien practices at 2 locations in Chicago, Illinois
Dr. O'Brien's primary practice is John H. Stroger, Jr. Hospital of Cook County, at 1901 W Harrison St, Chicago, IL 60612 in Cook County. The practice phone is (312) 864-6000. The NPI Registry lists Dr. O'Brien's practice address as 1740 W Taylor St, Chicago, IL 60612.
- John H. Stroger, Jr. Hospital of Cook CountyPrimary1901 W Harrison St, Chicago, IL 60612 · Cook CountyPhone(312) 864-6000
- NPI Registry address1740 W Taylor St, Chicago, IL 60612 · Cook CountyPhone(312) 864-6000
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. John M. O'Brien is affiliated with 1 site of care and 1 medical group
Dr. O'Brien's primary practice is John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government. The medical group on file is John H. Stroger, Jr. Hospital of Cook County.
Sources: Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John M. O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Brien practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John H. Stroger, Jr. Hospital of Cook County | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John M. 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. John M. O'Brien billed Medicare for 96 services in 2023
CMS data shows 96 Medicare services from Dr. O'Brien across 2 procedure codes in 2023, all of them office visits. Medicare paid $7,055 for them. Every service was in an office.
Dr. O'Brien's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 692023: 9639%
Dr. O'Brien compared with the Illinois median for internists, 2023
- Dr. O'Brien
- Illinois median
- Medicare services
- 96vs 56683% below
- Part D claims
- 187vs 28434% 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, 2023
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. John M. O'Brien's patients have a median age of 70
Across all payers, Dmand AI patient panel data puts Dr. O'Brien's median patient age at 70, with 69% women.
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 70
Patient panel by sex, all payers
- Women69%
- Men31%
Source: Dmand AI Patient Panel Data
Dr. John M. O'Brien wrote 324 Medicare Part D claims in 2024
In 2024, Dr. O'Brien wrote 324 Medicare Part D claims for 40 patients. 79% of them were for generic drugs. CMS names the drug for 187 of them, across 11 drugs with 11 or more claims each, at $2,377 in total drug cost. In 2023, CMS named 697 claims across 25 drugs.
Dr. O'Brien's Part D claims by kind of drug, 2024
- Generic257 claims79%
- Brand-name51 claims16%
- Other16 claims5%
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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6972024: 18773%
Drugs named by CMS: 11 in 2024, 25 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. John M. O'Brien scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. O'Brien for performance year 2024, reported as part of a group.
Dr. O'Brien's MIPS scores, performance year 2024
- 95of 100Final score
- 74.7of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 85of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John M. 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 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John M. 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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand 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 Data |
| 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 | Clinician Public Reporting: Overall MIPS Performance (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. John M. 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. John M. O'Brien's NPI number?
Dr. John M. O'Brien's NPI number is 1376572891. It was assigned on June 30, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John M. O'Brien?
Dr. John M. O'Brien is an internist in Chicago, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John M. O'Brien practice?
Dr. O'Brien practices at 1901 W Harrison St, Chicago, IL 60612. Dr. O'Brien also practices at 1740 W Taylor St, Chicago, IL 60612. Dr. O'Brien's primary practice is John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government.
What is Dr. John M. O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (312) 864-6000.
What is Dr. John M. O'Brien's medical license number?
Dr. O'Brien holds Illinois license 036082069.
Which hospitals is Dr. John M. O'Brien affiliated with?
Dr. O'Brien practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois.
What medical group is Dr. John M. O'Brien part of?
Dr. O'Brien is linked to John H. Stroger, Jr. Hospital of Cook County.
Does Dr. John M. O'Brien accept Medicare?
Yes. CMS data shows Dr. O'Brien billed Medicare for 96 services in 2023.
What is Dr. John M. O'Brien's MIPS score?
Dr. O'Brien's MIPS final score for performance year 2024 is 95 out of 100, reported as part of a group.
What services does Dr. John M. O'Brien bill to Medicare?
In 2023, Dr. O'Brien's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
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Where did Dr. John M. O'Brien go to medical school?
Dr. O'Brien graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1988.
What drugs does Dr. John M. O'Brien prescribe most?
In 2024 Medicare Part D data, Dr. O'Brien's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Famotidine.
How long has Dr. John M. O'Brien been practicing?
Dr. O'Brien graduated from medical school in 1988, 38 years ago.
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