Dr. Stephen O'Brien, MD
- Medicare services, 2018
- 15
- Part D claims, 2024
- 790
- Publications
- 243
- Hospital affiliations
- 1
- Industry payments
- $111
- Practice address
- 350 Hawthorne Avenue, Oakland, CA 94609
- Practice phone
- Call (510) 655-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Stephen O'Brien is an internist in Oakland, California
Dr. O'Brien practices at Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health.
Dr. O'Brien's NPI, 1699794453, was assigned on July 19, 2006. Dr. O'Brien holds California license G74654.
- NPI
- 1699794453NPI Registry (opens in a new tab)
- NPI enumeration date
- July 19, 2006
- NPI status
- Active
- Practice phone
- (510) 655-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Stephen O'Brien practices at Alta Bates Summit Medical Center in Oakland, California
Dr. O'Brien's primary practice is Alta Bates Summit Medical Center, at 350 Hawthorne Avenue, Oakland, CA 94609 in Alameda County. The practice phone is (510) 655-4000.
- Alta Bates Summit Medical Center350 Hawthorne Avenue, Oakland, CA 94609 · Alameda CountyPhone(510) 655-4000
Source: Dmand AI Affiliation Data
Dr. Stephen O'Brien is affiliated with 1 site of care
Dr. O'Brien's primary practice is Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Stephen 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 |
|---|---|
| Alta Bates Summit Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Sutter Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Stephen O'Brien is one of 16,751 internists in California
Internal medicine is Dr. O'Brien's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. O'Brien is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
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. Stephen O'Brien billed Medicare for 15 services in 2018
CMS data shows 15 Medicare services from Dr. O'Brien across 1 procedure code in 2018, all of them office visits. Medicare paid $450 for them. Every service was in an office.
Dr. O'Brien's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 652018: 1577%
Dr. O'Brien compared with the California median for internists, 2018
- Dr. O'Brien
- California median
- Medicare services
- 15vs 36196% below
- Part D claims
- 529vs 42126% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. O'Brien's most billed Medicare procedure codes, 2018
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 California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stephen 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 19% 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
- Women19%
- Men67%
Source: Dmand AI Patient Panel Data
Dr. Stephen O'Brien wrote 790 Medicare Part D claims in 2024
In 2024, Dr. O'Brien wrote 790 Medicare Part D claims for 25 patients. 68% of them were for generic drugs. CMS names the drug for 529 of them, across 26 drugs with 11 or more claims each, at $693,772 in total drug cost. In 2023, CMS named 1,014 claims across 42 drugs.
Dr. O'Brien's Part D claims by kind of drug, 2024
- Generic534 claims68%
- Brand-name256 claims32%
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
- Opioids5%43 of 790 claims
- Antibiotics1%11 of 790 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: 1,0142024: 52948%
Drugs named by CMS: 26 in 2024, 42 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
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Dr. Stephen O'Brien has 243 publications on record
Dmand AI links 243 papers to Dr. O'Brien, published from 2010 to 2025. 2016 was the busiest year, with 27. The most frequent topics are Genome, Phylogeny and Genetic Variation. Dr. O'Brien has published most often in Gigascience. Dr. O'Brien's most frequent co-authors are Warren Evan Johnson, MD, Susan Galandiuk, MD and Joshua Scott Dines, MD.
Dr. O'Brien's papers by year, 2016 to 2025
Topics Dr. O'Brien writes about most
- Genome
- Phylogeny
- Genetic Variation
- Polymorphism, Single Nucleotide
- Evolution, Molecular
- Genomics
- Sequence Analysis, DNA
- Cats
Dr. O'Brien's most frequent co-authors
- Warren Evan Johnson, MD36 shared papers
- Susan Galandiuk, MD12 shared papers
- Joshua Scott Dines, MD8 shared papers
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 internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Stephen O'Brien received $111 in industry payments from 2017 to 2019
CMS Open Payments shows 4 general payments to Dr. O'Brien from 2 drug and device companies from 2017 to 2019. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $63.
General payments to Dr. O'Brien by program year, 2017 to 2019
Companies that paid Dr. O'Brien the most, 2017 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Stephen 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 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) |
| 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) |
| 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. Stephen 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. Stephen O'Brien's NPI number?
Dr. Stephen O'Brien's NPI number is 1699794453. It was assigned on July 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephen O'Brien?
Dr. Stephen O'Brien is an internist in Oakland, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stephen O'Brien practice?
Dr. O'Brien practices at 350 Hawthorne Avenue, Oakland, CA 94609. Dr. O'Brien's primary practice is Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health.
What is Dr. Stephen O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (510) 655-4000.
What is Dr. Stephen O'Brien's medical license number?
Dr. O'Brien holds California license G74654.
Which hospitals is Dr. Stephen O'Brien affiliated with?
Dr. O'Brien practices at Alta Bates Summit Medical Center in Oakland, California.
Does Dr. Stephen O'Brien accept Medicare?
Yes. CMS data shows Dr. O'Brien billed Medicare for 15 services in 2018.
What services does Dr. Stephen O'Brien bill to Medicare?
In 2018, Dr. O'Brien's most billed Medicare services were office visit, established patient (99213).
What drugs does Dr. Stephen O'Brien prescribe most?
In 2024 Medicare Part D data, Dr. O'Brien's most prescribed drugs by claims were Biktarvy, Atorvastatin Calcium and Testosterone.
Has Dr. Stephen O'Brien received payments from drug or device companies?
CMS Open Payments shows $111 in general payments to Dr. O'Brien from 2 companies from 2017 to 2019. The largest total came from Abbvie Inc.
Show 3 more questionsShow fewer questions
How long has Dr. Stephen O'Brien been practicing?
Dr. O'Brien's NPI was assigned in 2006.
Does Dr. Stephen O'Brien do research?
Dmand AI links 243 publications to Dr. O'Brien, published from 2010 to 2025.
Who does Dr. Stephen O'Brien publish with?
Dr. O'Brien's most frequent co-authors are Warren Evan Johnson, MD (36 shared papers), Susan Galandiuk, MD (12 shared papers) and Joshua Scott Dines, MD (8 shared papers).
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