Dr. James D. O'Brien, MD
- Medicare services, 2024
- 912
- Medicare patients, 2024
- 145
- Part D claims, 2024
- 3,015
- Hospital affiliations
- 2
- Medical group
- 1
- Practice address
- 4870 Barranca Pkwy, Irvine, CA 92604
- Practice phone
- Call (949) 272-3800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Spectrum Internal Medicine Associates, Inc. a Professional Corporation
Irvine, California
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. James D. O'Brien is an internist in Irvine, California
Dr. O'Brien practices at Spectrum Internal Medicine Associates, Inc. a Professional Corporation in Irvine, California.
Dr. O'Brien's NPI, 1922188168, was assigned on October 16, 2006. Dr. O'Brien graduated from New York Medical College in 1992. Dr. O'Brien's California license number on file is 000000G78458.
- NPI
- 1922188168NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1658469598
- NPI enumeration date
- October 16, 2006
- NPI status
- Active
- Practice phone
- (949) 272-3800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. James D. O'Brien practices at Spectrum Internal Medicine Associates, Inc. a Professional Corporation in Irvine, California
Dr. O'Brien's primary practice is Spectrum Internal Medicine Associates, Inc. a Professional Corporation, at 4870 Barranca Pkwy, Irvine, CA 92604 in Orange County. The practice phone is (949) 272-3800.
- Spectrum Internal Medicine Associates, Inc. a Professional Corporation4870 Barranca Pkwy, Irvine, CA 92604 · Orange CountyPhone(949) 272-3800
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. James D. O'Brien is affiliated with 4 sites of care and 1 medical group
Dr. O'Brien's primary practice is Spectrum Internal Medicine Associates, Inc. a Professional Corporation in Irvine, California. Dr. O'Brien is also affiliated with UCI Health - Orange. The medical group on file is Spectrum Internal Medicine Associates. Dmand AI also links Dr. O'Brien to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. James D. O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Brien practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Spectrum Internal Medicine Associates, Inc. a Professional Corporation | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. James D. 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 board certified in internal medicine by the American Board of Internal Medicine. Dr. O'Brien has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists alzheimer's disease, asthma, atrial fibrillation and flutter, chronic anemia, chronic diabetes, chronic hypertension, chronic kidney disease and chronic obstructive pulmonary disease (COPD) among the conditions Dr. O'Brien treats.
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. James D. O'Brien billed Medicare for 912 services in 2024
CMS data shows 912 Medicare services from Dr. O'Brien across 6 procedure codes in 2024, for 145 Medicare patients. Medicare paid $51,797 for them. Every service was in an office.
Dr. O'Brien's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4352024: 57833%
- Other services
- 2023: 222024: 3111314%
- Tests and treatments
- 2023: 272024: 2315%
Dr. O'Brien compared with the California median for internists, 2024
- Dr. O'Brien
- California median
- Medicare services
- 912vs 3612.5 times
- Medicare patients
- 145vs 151Close to median
- Part D claims
- 2,504vs 4215.9 times
Medians across 15,815 internists in California 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.
Need commercial claims for Dr. O'Brien?
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. James D. O'Brien treated 145 Medicare patients in 2024, average age 72
CMS counts 145 Medicare patients who saw Dr. O'Brien in 2024. The largest group is 65 to 74, with 102 patients. 75% of them have high cholesterol, and 67% have high blood pressure. Their average risk score is 0.73, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Brien's median patient age at 57, with 34% 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
- Women4128%
- Men10472%
Chronic conditions among Dr. O'Brien's Medicare patients, 2024
- High cholesterol75%
- High blood pressure67%
- Arthritis42%
- Diabetes28%
- Ischemic heart disease22%
- Mood disorders17%
- Cancer16%
- Depression16%
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 57
Patient panel by sex, all payers
- Women34%
- Men65%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. James D. O'Brien wrote 3,015 Medicare Part D claims in 2024
In 2024, Dr. O'Brien wrote 3,015 Medicare Part D claims for 207 patients. 92% of them were for generic drugs. CMS names the drug for 2,504 of them, across 70 drugs with 11 or more claims each, at $87,193 in total drug cost. In 2023, CMS named 2,378 claims across 69 drugs.
Dr. O'Brien's Part D claims by kind of drug, 2024
- Generic2,764 claims92%
- Brand-name and other251 claims8%
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
- Opioids1%35 of 3,015 claims
- Antibiotics4%115 of 3,015 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: 2,3782024: 2,5045%
Drugs named by CMS: 70 in 2024, 69 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. James D. O'Brien graduated from New York Medical College
Dr. O'Brien graduated from New York Medical College in 1992.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. James D. O'Brien accepts plans from 13 insurance carriers
Dr. O'Brien is in network with 13 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. HMO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Elevance
- HCSC
- Alliant Health Plans
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- +5 more carriersWith a free account
Plan types Dr. O'Brien accepts, by number of carriers
- HMO7
- PPO7
- EPO4
- POS4
- Medicare3
Source: Dmand AI Insurance Network Data
Sources for Dr. James D. 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 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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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 D. 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. James D. O'Brien's NPI number?
Dr. James D. O'Brien's NPI number is 1922188168. It was assigned on October 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. James D. O'Brien?
Dr. James D. O'Brien is an internist in Irvine, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. James D. O'Brien practice?
Dr. O'Brien practices at 4870 Barranca Pkwy, Irvine, CA 92604. Dr. O'Brien's primary practice is Spectrum Internal Medicine Associates, Inc. a Professional Corporation in Irvine, California. Dmand AI also links Dr. O'Brien to 1 hospital and 1 group practice or clinic.
What is Dr. James D. O'Brien's office phone number?
The practice phone on file for Dr. O'Brien is (949) 272-3800.
What is Dr. James D. O'Brien's medical license number?
Dr. O'Brien's California license number on file is 000000G78458.
Which hospitals is Dr. James D. O'Brien affiliated with?
Dr. O'Brien is affiliated with UCI Health - Orange. Dmand AI links Dr. O'Brien to 1 more hospital.
What medical group is Dr. James D. O'Brien part of?
Dr. O'Brien is linked to Spectrum Internal Medicine Associates.
Does Dr. James D. O'Brien accept Medicare?
Yes. CMS data shows Dr. O'Brien billed Medicare for 912 services in 2024.
How many Medicare patients does Dr. James D. O'Brien see?
CMS counts 145 Medicare patients who saw Dr. O'Brien in 2024, with an average age of 72.
Is Dr. James D. O'Brien board certified?
Yes. Dr. O'Brien is board certified in internal medicine by the American Board of Internal Medicine.
Show 5 more questionsShow fewer questions
What services does Dr. James D. O'Brien bill to Medicare?
In 2024, Dr. O'Brien's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and medicare service (G2211).
Where did Dr. James D. O'Brien go to medical school?
Dr. O'Brien graduated from New York Medical College in 1992.
What drugs does Dr. James D. O'Brien prescribe most?
In 2024 Medicare Part D data, Dr. O'Brien's most prescribed drugs by claims were Atorvastatin Calcium, Rosuvastatin Calcium and Amlodipine Besylate.
How long has Dr. James D. O'Brien been practicing?
Dr. O'Brien graduated from medical school in 1992, 34 years ago.
What insurance does Dr. James D. O'Brien accept?
Dr. O'Brien is in network with 13 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. HMO plans come from the most carriers, 7. Check the plan with the practice before a visit.
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