DR. TIMOTHY J O'BRIEN PH.D.
NPI 1275924557
Clinical Neuropsychologist in Fountain Valley, CA

Q: What is Timothy O'brien's NPI number?

The NPI number for Timothy O'brien is 1275924557. It was assigned to this individual provider in the NPPES registry on February 9, 2015.

Q: What is Timothy O'brien's specialty?

The primary specialty registered for this NPI is Clinical Neuropsychologist with taxonomy code 103G00000X.

Q: When was this NPI record last updated?

The NPPES record for Timothy O'brien was last updated on November 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since February 09, 2015PECOS EnrolledAccepts Medicare Assignment

100/100

CMS Quality Rating

10061 TALBERT AVE # 234, FOUNTAIN VALLEY, CA 92708(949) 526-9504 Get Directions Write a Review

NPPES record last updated: November 14, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Nov 14, 2025, Jun 17, 2025, May 20, 2025 and 1 more (4 updates tracked since 2025).

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About Dr. Timothy J O'brien Ph.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. TIMOTHY J O'BRIEN PH.D. (NPI 1275924557) is an individual clinical neuropsychologist in Fountain Valley, California, licensed in California (PSY26611) and active in the NPI registry since February 2015. He is enrolled in Medicare PECOS, maintains a secondary practice location in Long Beach, and is a graduate of Other (2012).

NPPES Registry Identity

NPI1275924557

Entity TypeIndividualMale

Primary Taxonomy103G00000X

Provider Legal NameDR. TIMOTHY J O'BRIENCredential: PH.D.

Location Address10061 TALBERT AVE # 234Fountain Valley, CA 92708-5159

Mailing Address6285 E Spring St # 598Long Beach, CA 90808-4020 · (205) 908-4125

Phone(949) 526-9504

Sole ProprietorNo

Medical School CMSOtherGraduated 2012

Enumeration DateFebruary 9, 2015

Last NPPES UpdateNovember 14, 20254 updates tracked since enumeration

NPPES CertifiedNovember 14, 2025

✔ NPI 1275924557 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyClinical NeuropsychologistBehavioral Health & Social Service Providers

Taxonomy Code103G00000X

License✔ Licensed in CA · PSY26611

Definition

A clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to normal and abnormal functioning of the central nervous system. The specialty is dedicated to enhancing the understanding of brain-behavior relationships and the application of such knowledge to human problems.

Also ListedPsychologist · ClinicalTaxonomy 103TC0700X · License PSY26611 (CA)

10061 TALBERT AVE # 234, Fountain Valley, CA 92708

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Secondary Practice Location 1

Location 12708 Ostrom AveLong Beach, CA 90815-1603 · Phone (949) 526-9504

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Timothy J O'brien Ph.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7719206945

PECOS Enrollment IDI20150508002098

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Evaluation of neuropsychological test, each additional hour 96133

This service involves further evaluation of your neuropsychological test results beyond the initial hour. It helps to understand your cognitive functioning better, focusing on areas like memory, attention, and problem-solving skills.

292 services73 patients

Administration of psychological or neuropsychological test, each additional 30 minutes 96137

This procedure involves administering psychological or neuropsychological tests to evaluate your mental functions. Each additional 30 minutes allows for a more in-depth assessment of your cognitive abilities, emotions, and behavior. It's crucial for accurate diagnosis and treatment planning.

216 services73 patients

Psychiatric diagnostic evaluation 90791

A psychiatric diagnostic evaluation is a thorough assessment used to identify any mental health conditions you may have. It involves a detailed discussion about your symptoms, thoughts, feelings and behavior patterns. Your medical history and family's mental health history are also considered.

74 services74 patients

Evaluation of neuropsychological test, first hour 96132

An evaluation of neuropsychological tests is a process to assess your brain's function. It involves tasks designed to measure cognitive abilities such as memory, attention, problem-solving, and language skills. The first hour involves initial testing and observation.

73 services73 patients

Administration of psychological or neuropsychological test, first 30 minutes 96136

This procedure involves a health professional conducting a psychological or neuropsychological test. The first 30 minutes typically involve understanding your mental health or brain function through various assessments. This helps in diagnosing and treating mental health disorders effectively.

73 services73 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

82.4

Promoting Interoperability

100

Improvement Activities

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

VISION NEUROPSYCHOLOGY & PSYCHOLOGY

Clinical Neuropsychologist

10061 TALBERT AVE # 234
FOUNTAIN VALLEY, CA 92708

Orange County (949) 526-9504

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Timothy O'brien's NPI number?

The NPI number for Timothy O'brien is 1275924557. It was assigned to this individual provider in the NPPES registry on February 9, 2015.

Where is Timothy O'brien located?

Timothy O'brien practices at 10061 Talbert Ave # 234, Fountain Valley, CA 92708. The listed phone number is (949) 526-9504.

What is Timothy O'brien's specialty?

The primary specialty registered for this NPI is Clinical Neuropsychologist with taxonomy code 103G00000X.

Is Timothy O'brien enrolled in Medicare?

Yes. Timothy O'brien is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Timothy O'brien was last updated on November 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.