James E. O'Brien, M.D.
Forensic Psychiatry Physician · Mira Loma, CA
James E. O'Brien, M.D. is a forensic psychiatry physician with a practice address in Mira Loma, California, and NPI 1275785974, issued on Oct 14, 2008. Check the license (California G50733, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James E. O'Brien
- Credential
- M.D.
- Primary taxonomy
- Forensic Psychiatry Physician 2084F0202X
- License number
- G50733 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10427 San Sevaine Way, Mira Loma, CA 91752
- Phone
- (951) 360-0997
- Enumerated
- Oct 14, 2008
- Record last updated
- Oct 14, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (951) 361-1394
- Entity
- Type 1 · individual
8 nearest forensic psychiatry physician records → All 109 in California → Look up another NPI →
Also registered at 10427 San Sevaine Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Douglas Pollock, PTPhysical Therapist1023202538
Verify James E. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G50733Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average forensic psychiatry physician in 2024
41 Medicare Part D claims, against an average of 803 among the 199 providers of this specialty who prescribed in Part D.
Most prescribed
- Alprazolam12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
James E. O'Brien among 109 forensic psychiatry physician records in California
James E. O'Brien, M.D. is one of 109 forensic psychiatry physician records with a practice address in California. 41% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 72% of them.
- NPI issued2008 · 72% of these records are older, 24% newer
- In a Medicare fileYes · 41% of these records are
- In the CMS Doctors and Clinicians fileNo · 14% of these records are
- Record last updated2008 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084F0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1 forensic psychiatry physician record lists a practice address in Mira Loma
They are 1 of the 37 NPPES records with a practice address in Mira Loma, and 109 forensic psychiatry physician records in California.
All 109 in California → Every provider in Mira Loma → Forensic Psychiatry Physician nationwide →
The 8 forensic psychiatry physician records with the nearest ZIP codes
- Markus Ploesser, MDChula Vista, CA 919101669662755
- Jason Kornberg, M.D.La Jolla, CA 920371073685764
- Michael Takamura, MDPoway, CA 920641992739338
- Lester Zackler, M.D.Sherman Oaks, CA 914231497760169
- Ansar Haroun, MDSan Diego, CA 921011174630404
- David Naimark, M.D.San Diego, CA 921011265458087
- Dominick Addario, M.D.San Diego, CA 921031649496092
- Benjamin Bensoul, M.D.San Diego, CA 921061558467118
Common questions
What is James E. O'Brien, M.D.'s NPI number?
James E. O'Brien, M.D.'s National Provider Identifier (NPI) is 1275785974, issued on Oct 14, 2008. An NPI identifies a provider in billing; it is not a license.
Where is James E. O'Brien, M.D. located?
The NPPES record lists a practice address at 10427 San Sevaine Way, Mira Loma, CA, 91752. Phone: (951) 360-0997. Providers update this record themselves, so call before visiting.
How can I verify James E. O'Brien, M.D.'s license?
NPPES lists California license number G50733, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does James E. O'Brien, M.D. prescribe under Medicare Part D?
In 2024, James E. O'Brien, M.D. had 41 Medicare Part D claims; the average among forensic psychiatry physician prescribers was 803. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.