Timothy O'Brien, PH.D.
NPI 1275924557 · Clinical Neuropsychologist · Fountain Valley, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1275924557
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- PSY26611 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
728 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Evaluation of Neuropsychological Test, Each Additional Hour96133 | 292 | $82 |
| Administration of Psychological Or Neuropsychological Test, Each Additional 30 Minutes96137 | 216 | $19 |
| Psychiatric Diagnostic Evaluation90791 | 74 | $160 |
| Evaluation of Neuropsychological Test, First Hour96132 | 73 | $114 |
| Administration of Psychological Or Neuropsychological Test, First 30 Minutes96136 | 73 | $25 |
Typical Medicare-allowed amounts for these services range $19–$160 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 2708 Ostrom AveLong Beach, CA 90815-1603Phone: (949) 526-9504
Registry dates
- Enumerated
- 2015-02-09
- Last updated
- 2025-11-14
- Certified
- 2025-11-14
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.