Dr. James K. Obrien, MD
- Medicare services, 2024
- 3,437
- Medicare patients, 2024
- 1,401
- Part D claims, 2024
- 1,831
- MIPS score, 2024
- 95
- Hospital affiliations
- 4
- Practice address
- 1500 Commonwealth Avenue, Williamsburg, VA 23185
- Practice phone
- Call (757) 585-2010
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Obrien'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. James K. Obrien is a cardiologist in Williamsburg, Virginia
Dr. Obrien practices at Riverside Doctors' Hospital Williamsburg in Williamsburg, Virginia, part of Riverside Health System.
Dr. Obrien's NPI, 1326233511, was assigned on September 11, 2007. Dr. Obrien graduated from University of Vermont College of Medicine in 1985. Dr. Obrien holds New York license 168234.
- NPI
- 1326233511NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3971523739
- NPI enumeration date
- September 11, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (757) 585-2010
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. James K. Obrien practices at Riverside Doctors' Hospital Williamsburg in Williamsburg, Virginia
Dr. Obrien's primary practice is Riverside Doctors' Hospital Williamsburg, at 1500 Commonwealth Avenue, Williamsburg, VA 23185 in James City. The practice phone is (757) 585-2010.
- Riverside Doctors' Hospital Williamsburg1500 Commonwealth Avenue, Williamsburg, VA 23185 · James CityPhone(757) 585-2010
Source: Dmand AI Affiliation Data
Dr. James K. Obrien is affiliated with 4 sites of care and 1 medical group
Dr. Obrien's primary practice is Riverside Doctors' Hospital Williamsburg in Williamsburg, Virginia, part of Riverside Health System. Dr. Obrien is also affiliated with Sentara Williamsburg Regional Medical Center. The medical group on file is Riverside Gastroenterology Specialists. Dmand AI also links Dr. Obrien to 2 more hospitals, 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. James K. Obrien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Obrien practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Riverside Doctors' Hospital Williamsburg | Available with a free account |
| +3 more affiliated sites | 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 Riverside Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. James K. Obrien is one of 562 cardiologists in Virginia
Cardiovascular disease is Dr. Obrien's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dmand AI has Dr. Obrien's licenses on file in 2 states: New York and Vermont.
Specialties and state licenses
- Cardiovascular disease, New YorkPrimary
- Vermont license
Cardiologists near Dr. Obrien
Counts of cardiologists 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. James K. Obrien billed Medicare for 3,437 services in 2024
CMS data shows 3,437 Medicare services from Dr. Obrien across 18 procedure codes in 2024, for 1,401 Medicare patients. Medicare paid $116,259 for them.
Dr. Obrien's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2,0912024: 2,2196%
- Office and hospital visits
- 2023: 1,1212024: 1,0853%
- Other services
- 2023: 02024: 119
- Imaging
- 2023: 02024: 14
Where Dr. Obrien's Medicare services took place, 2024
- In an office1,94457%
- In a facility1,49343%
Dr. Obrien compared with the Virginia median for cardiologists, 2024
- Dr. Obrien
- Virginia median
- Medicare services
- 3,437vs 2,25253% above
- Medicare patients
- 1,401vs 1,17819% above
- Part D claims
- 1,661vs 1,47213% above
Medians across 562 cardiologists in Virginia with Dmand AI profiles that report each measure.
Dr. Obrien'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. Obrien and other cardiologists in Virginia.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. James K. Obrien treated 1,401 Medicare patients in 2024, average age 77
CMS counts 1,401 Medicare patients who saw Dr. Obrien in 2024. The largest group is 75 to 84, with 574 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 6% are also on Medicaid. Their average risk score is 1.49, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Obrien's median patient age at 64, with 56% women.
Dr. Obrien's Medicare patients by age, 2024
Dr. Obrien's Medicare patients by sex, 2024
- Women73252%
- Men66948%
Chronic conditions among Dr. Obrien's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Ischemic heart disease33%
- Chronic kidney disease32%
- Atrial fibrillation31%
- Diabetes30%
- Heart failure30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Obrien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. James K. Obrien wrote 1,831 Medicare Part D claims in 2024
In 2024, Dr. Obrien wrote 1,831 Medicare Part D claims for 347 patients. 83% of them were for generic drugs. CMS names the drug for 1,661 of them, across 32 drugs with 11 or more claims each, at $361,314 in total drug cost. In 2023, CMS named 1,191 claims across 25 drugs.
Dr. Obrien's Part D claims by kind of drug, 2024
- Generic1,520 claims83%
- Brand-name311 claims17%
Dr. Obrien'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: 1,1912024: 1,66139%
Drugs named by CMS: 32 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. James K. Obrien 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. Obrien for performance year 2024, reported through an alternative payment model (APM). Dr. Obrien accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Obrien's MIPS scores, performance year 2024
- 95of 100Final score
- 92.9of 100Quality
- 95of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. James K. Obrien received $955 in industry payments from 2016 to 2025
CMS Open Payments shows 47 general payments to Dr. Obrien from 18 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $165.
General payments to Dr. Obrien by program year, 2016 to 2025
Companies that paid Dr. Obrien the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. James K. Obrien graduated from University of Vermont College of Medicine
Dr. Obrien graduated from University of Vermont College of Medicine in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. James K. Obrien'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)Clinician Public Reporting: Overall MIPS Performance (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. James K. Obrien
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. James K. Obrien's NPI number?
Dr. James K. Obrien's NPI number is 1326233511. It was assigned on September 11, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. James K. Obrien?
Dr. James K. Obrien is a cardiologist in Williamsburg, Virginia. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. James K. Obrien practice?
Dr. Obrien practices at 1500 Commonwealth Avenue, Williamsburg, VA 23185. Dr. Obrien's primary practice is Riverside Doctors' Hospital Williamsburg in Williamsburg, Virginia, part of Riverside Health System. Dmand AI also links Dr. Obrien to 2 hospitals.
What is Dr. James K. Obrien's office phone number?
The practice phone on file for Dr. Obrien is (757) 585-2010.
What is Dr. James K. Obrien's medical license number?
Dr. Obrien holds New York license 168234, one of the licenses on file in 2 states.
Which states has Dr. James K. Obrien been licensed in?
Dmand AI has state licenses on file for Dr. Obrien in New York and Vermont.
Which hospitals is Dr. James K. Obrien affiliated with?
Dr. Obrien practices at Riverside Doctors' Hospital Williamsburg in Williamsburg, Virginia. Dr. Obrien is also affiliated with Sentara Williamsburg Regional Medical Center. Dmand AI links Dr. Obrien to 2 more hospitals.
What medical group is Dr. James K. Obrien part of?
Dr. Obrien is linked to Riverside Gastroenterology Specialists.
Does Dr. James K. Obrien accept Medicare?
Yes. CMS data shows Dr. Obrien billed Medicare for 3,437 services in 2024, and Dr. Obrien accepts Medicare assignment.
What is Dr. James K. Obrien's MIPS score?
Dr. Obrien's MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
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How many Medicare patients does Dr. James K. Obrien see?
CMS counts 1,401 Medicare patients who saw Dr. Obrien in 2024, with an average age of 77.
What services does Dr. James K. Obrien bill to Medicare?
In 2024, Dr. Obrien's most billed Medicare services were heart test or procedure (93010), office visit, established patient (99214) and heart test or procedure (93306).
Where did Dr. James K. Obrien go to medical school?
Dr. Obrien graduated from University of Vermont College of Medicine in 1985.
What drugs does Dr. James K. Obrien prescribe most?
In 2024 Medicare Part D data, Dr. Obrien's most prescribed drugs by claims were Metoprolol Succinate, Eliquis and Carvedilol.
Has Dr. James K. Obrien received payments from drug or device companies?
CMS Open Payments shows $955 in general payments to Dr. Obrien from 18 companies from 2016 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. James K. Obrien been practicing?
Dr. Obrien graduated from medical school in 1985, 41 years ago.
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