Grahamm Wiest, PSY.D.
Clinical Neuropsychologist · Mission Viejo, CA
Grahamm Wiest, PSY.D. is a clinical neuropsychologist with a practice address in Mission Viejo, California, and NPI 1962015628, issued on Aug 24, 2020. Check the license (California 34353, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Grahamm Wiest
- Credential
- PSY.D.
- Primary taxonomy
- Clinical Neuropsychologist 103G00000X
- License number
- 34353 CA
Self-reported in NPPES; status is on the state search - Practice location
- 26800 Crown Valley Pkwy Ste 320, Mission Viejo, CA 92691
- Phone
- (949) 365-2468
- Enumerated
- Aug 24, 2020
- Record last updated
- Jul 15, 2025
- Medicare enrollment
- Enrolled (PECOS I20250729004785); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical neuropsychologist records → All 743 in California → Look up another NPI →
Also registered at 26800 Crown Valley Pkwy Ste 320
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joman AlomarNurse Practitioner1538020995
Verify Grahamm Wiest in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 34353Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Providence Medical FoundationMission Viejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Grahamm Wiest among 743 clinical neuropsychologist records in California
Grahamm Wiest, PSY.D. is one of 743 clinical neuropsychologist records with a practice address in California. 23% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 85% of them.
- NPI issued2020 · 85% of these records are older, 13% newer
- In a Medicare fileYes · 23% of these records are
- In the CMS Doctors and Clinicians fileYes · 32% of these records are
- Graduated2021 · median 2011 among the 237 with a school on file
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103G00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Clinical Neuropsychologist providers in California
There are 743 clinical neuropsychologist records in California.
All 743 in California → Every provider in Mission Viejo → Clinical Neuropsychologist nationwide →
The 8 clinical neuropsychologist records with the nearest ZIP codes
- Cathearine Jenkins Hall, PHDMission Viejo, CA 926911588694954
- Kathleen MontemagniMission Viejo, CA 926911154941573
- Roger Perez, PH.D.Mission Viejo, CA 926911225369549
- Ronald Gellis, PH.D.Rancho Santa Margarita, CA 926881891038352
- Evelyn SpilleLadera Ranch, CA 926941194535898
- Maria Corona, PHDIrvine, CA 926971487912960
- Michael Lopez, PHDIrvine, CA 926971760976070
- Melanie Lucas, PHDIrvine, CA 926971922721489
Common questions
What is Grahamm Wiest, PSY.D.'s NPI number?
Grahamm Wiest, PSY.D.'s National Provider Identifier (NPI) is 1962015628, issued on Aug 24, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Grahamm Wiest, PSY.D. located?
The NPPES record lists a practice address at 26800 Crown Valley Pkwy Ste 320, Mission Viejo, CA, 92691. Phone: (949) 365-2468. Providers update this record themselves, so call before visiting.
How can I verify Grahamm Wiest, PSY.D.'s license?
NPPES lists California license number 34353, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.