Timothy J O'Brien, PH.D.

Primary specialty

Clinical NeuropsychologistTaxonomy code 103G00000X

License

PSY26611 Issued in CA

Practice address

10061 Talbert Ave # 234
Fountain Valley, CA 92708-5159

Phone

(949) 526-9504

NPI assigned

Feb 9, 2015

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: No
• Power mobility devices: No
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Clinical Psychologist

Education

Other, 2012

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Philosophy

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Vision Neuropsychology & Psychology

  • Clinical Neuropsychologist
  • Fountain Valley, CA
  • NPI 1396631388
  Medicare reassignment NPD Authorized official
• University of California Irvine

  • Infusion Therapy Clinic/Center
  • Irvine, CA
  • NPI 1417027475
  NPD (past)
• University of California Irvine

  • General Acute Care Hospital
  • Orange, CA
  • NPI 1689608150
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1423440000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1763078400000",
    "number": "1275924557",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6285 E SPRING ST # 598",
            "city": "LONG BEACH",
            "state": "CA",
            "postal_code": "908084020",
            "telephone_number": "205-908-4125"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "10061 TALBERT AVE # 234",
            "city": "FOUNTAIN VALLEY",
            "state": "CA",
            "postal_code": "927085159",
            "telephone_number": "949-526-9504"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2708 Ostrom Ave",
            "address_purpose": "LOCATION",
            "city": "Long Beach",
            "state": "CA",
            "postal_code": "908151603",
            "country_code": "US",
            "telephone_number": "949-526-9504",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "TIMOTHY",
        "middle_name": "J",
        "name_prefix": "Dr.",
        "credential": "PH.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-02-09",
        "last_updated": "2025-11-14",
        "certification_date": "2025-11-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "103G00000X",
            "taxonomy_group": "",
            "desc": "Clinical Neuropsychologist",
            "state": "CA",
            "license": "PSY26611",
            "primary": true
        },
        {
            "code": "103TC0700X",
            "taxonomy_group": "",
            "desc": "Psychologist, Clinical",
            "state": "CA",
            "license": "PSY26611",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Lee H Novick, M.D.
• Derek Bernard Sylver Novida
• Nuedge Physical Therapy Inc
• Jeanne Nwagwu, DO
• Yvonne Nyquist, RNP
• Alyson O'Connor, DPT
• Claudia O'Connor, DDS
• Joseph Lawrence O'Connor, DDS
• Oakwood Healthcare Services Inc.
• Deborah Jean Oates, N.P.

• Clinical Neuropsychologist in Fountain Valley, CA
• Providers in Fountain Valley, CA by specialty
• Clinical Neuropsychologist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 14, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.