Timothy J. O'Brien, PH.D.
Clinical Neuropsychologist · Fountain Valley, CA
Timothy J. O'Brien, PH.D. is a clinical neuropsychologist with a practice address in Fountain Valley, California, and NPI 1275924557, issued on Feb 9, 2015. Check the license (California PSY26611, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Timothy J. O'Brien
- Credential
- PH.D.
- Primary taxonomy
- Clinical Neuropsychologist 103G00000X
- License number
- PSY26611 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10061 Talbert Ave # 234, Fountain Valley, CA 92708
- Phone
- (949) 526-9504
- Enumerated
- Feb 9, 2015
- Record last updated
- Nov 14, 2025
- Medicare enrollment
- Enrolled (PECOS I20150508002098); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest clinical neuropsychologist records → All 743 in California → Look up another NPI →
Verify Timothy J. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY26611Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Timothy J. O'Brien among 743 clinical neuropsychologist records in California
Timothy J. O'Brien, PH.D. is one of 743 clinical neuropsychologist records with a practice address in California. 23% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 67% of them.
- NPI issued2015 · 67% of these records are older, 28% newer
- In a Medicare fileYes · 23% of these records are
- In the CMS Doctors and Clinicians fileYes · 32% of these records are
- Graduated2012 · median 2011 among the 237 with a school on file
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103G00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Clinical Neuropsychologist providers in California
There are 743 clinical neuropsychologist records in California.
All 743 in California → Every provider in Fountain Valley → Clinical Neuropsychologist nationwide →
The 8 clinical neuropsychologist records with the nearest ZIP codes
- Jessica Brommelhoff, PH.D.Santa Ana, CA 927051871982314
- Stephanie Moore, PSYDSanta Ana, CA 927051225032865
- Maria Corona, PHDIrvine, CA 926971487912960
- Michael Lopez, PHDIrvine, CA 926971760976070
- Melanie Lucas, PHDIrvine, CA 926971922721489
- Mark Mapstone, PHDIrvine, CA 926971760597223
- Evelyn SpilleLadera Ranch, CA 926941194535898
- Cathearine Jenkins Hall, PHDMission Viejo, CA 926911588694954
Common questions
What is Timothy J. O'Brien, PH.D.'s NPI number?
Timothy J. O'Brien, PH.D.'s National Provider Identifier (NPI) is 1275924557, issued on Feb 9, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Timothy J. O'Brien, PH.D. located?
The NPPES record lists a practice address at 10061 Talbert Ave # 234, Fountain Valley, CA, 92708. Phone: (949) 526-9504. Providers update this record themselves, so call before visiting.
How can I verify Timothy J. O'Brien, PH.D.'s license?
NPPES lists California license number PSY26611, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
What is Timothy J. O'Brien, PH.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.