Grahamm Wiest, PSY.D.

Primary specialty

Clinical NeuropsychologistTaxonomy code 103G00000X

License

34353 Issued in CA

Practice address

26800 Crown Valley Pkwy Ste 320
Mission Viejo, CA 92691-7320

Phone

(949) 365-2468

NPI assigned

Aug 24, 2020

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: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Neuropsychiatry

Education

Other, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Providence Medical FoundationGroup PAC ID 8921993205, 1,461 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

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.

• Providence Medical Foundation

  • Family Medicine Physician
  • Brea, CA
  • NPI 1871607762
  Medicare reassignment Care Compare group NPD
• Providence Medical Foundation

  • General Practice Physician
  • Diamond Bar, CA
  • NPI 1285890624
  NPD
• Providence Medical Foundation

  • Family Medicine Physician
  • Anaheim, CA
  • NPI 1639715709
  NPD
• Western Youth Services

  • Adolescent and Children Mental Health Clinic/Center
  • Anaheim, CA
  • NPI 1770617987
  NPD (past)

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

{
    "created_epoch": "1598227200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1752537600000",
    "number": "1962015628",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "505 N EUCLID ST STE 300",
            "city": "ANAHEIM",
            "state": "CA",
            "postal_code": "928015514",
            "telephone_number": "714-871-5646"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "26800 CROWN VALLEY PKWY STE 320",
            "city": "MISSION VIEJO",
            "state": "CA",
            "postal_code": "926917320",
            "telephone_number": "949-365-2468"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1110 E Chapman Ave Ste 202",
            "address_purpose": "LOCATION",
            "city": "Orange",
            "state": "CA",
            "postal_code": "928662139",
            "country_code": "US",
            "telephone_number": "714-744-9754",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WIEST",
        "first_name": "GRAHAMM",
        "name_prefix": "Dr.",
        "credential": "PSY.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-08-24",
        "last_updated": "2025-07-15",
        "certification_date": "2025-07-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "103T00000X",
            "taxonomy_group": "",
            "desc": "Psychologist",
            "state": "CA",
            "license": null,
            "primary": false
        },
        {
            "code": "103G00000X",
            "taxonomy_group": "",
            "desc": "Clinical Neuropsychologist",
            "state": "CA",
            "license": "34353",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Alyese Lynette Whitfield
• Eugene Lorin Whitney, M.DIV, PH.D., MFT
• Whole Health Pharmacy
• James Wickham, MD
• Lynette Joy Wiens, R.N.
• Brandon Robert Wildish
• Cory Jamal Wilkin, MS, LMFT
• Lawrence Walton Will, DDS
• Kathryn Suzanne Willard, M.A., SLP
• William R Bartok MD Inc

• Clinical Neuropsychologist in Mission Viejo, CA
• Providers in Mission Viejo, CA by specialty
• Clinical Neuropsychologist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 15, 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.