Doctor profile · Federal record
Dr. Timothy O'Brien, PH.D.
Clinical Neuropsychologist (CMS: Clinical Psychologist) · Clinical Psychologist · Fountain Valley, CA
- NPI 1275924557
- Accepts Medicare
- MIPS 91.2 / 100 · 2023
- 14 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
10061 Talbert Ave # 234
Fountain Valley, CA 927085159
(949) 526-9504 - Additional location
-
2708 Ostrom Ave
Long Beach, CA 908151603 - Mailing address
-
6285 E Spring St # 598
Long Beach, CA 908084020
Credentials & registration
- NPI registered
- February 2015 — 11 yrs on file
- Profile last updated
- November 14, 2025
- Year of graduation
- 2012 — 14 yrs since
- Specialty taxonomy
- 103G00000X — NUCC code
- State license (1)
- California #PSY26611
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1275924557. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
685
Distinct HCPCS
5
Medicare allowed
$46,082
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
96133 |
Evaluation of neuropsychological test, each additional hour | 275 | 69 | $80 | |
96137 |
Administration of psychological or neuropsychological test, each additional 30 minutes | 203 | 68 | $19 | |
96132 |
Evaluation of neuropsychological test, first hour | 70 | 70 | $111 | |
96136 |
Administration of psychological or neuropsychological test, first 30 minutes | 69 | 69 | $25 | |
90791 |
Psychiatric diagnostic evaluation | 68 | 68 | $158 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 137. This provider delivers 5.0× the peer median.Frequently asked questions
What is Dr. Timothy O'Brien's medical specialty?
Dr. Timothy O'Brien practices Clinical Neuropsychologist in Fountain Valley, CA.
Where does Dr. Timothy O'Brien practice?
Dr. Timothy O'Brien practices at 10061 Talbert Ave # 234, Fountain Valley, CA 927085159. Office phone: 9495269504.
What is Dr. Timothy O'Brien's NPI?
Dr. Timothy O'Brien's National Provider Identifier (NPI) is 1275924557, issued by NPPES.
Does Dr. Timothy O'Brien accept Medicare assignment?
Yes. Dr. Timothy O'Brien accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Timothy O'Brien commonly perform?
Top Medicare-reported procedures in 2023: Evaluation of neuropsychological test, each additional hour (HCPCS 96133); Administration of psychological or neuropsychological test (HCPCS 96137); Evaluation of neuropsychological test, first hour (HCPCS 96132). Source: CMS Medicare Physician & Other Practitioners file.