DR. GRAHAMM WIEST PSY.D.
NPI 1962015628
Clinical Neuropsychologist in Mission Viejo, CA

Q: What is Grahamm Wiest's NPI number?

The NPI number for Grahamm Wiest is 1962015628. It was assigned to this individual provider in the NPPES registry on August 24, 2020.

Q: What is Grahamm Wiest's specialty?

The primary specialty registered for this NPI is Clinical Neuropsychologist with taxonomy code 103G00000X.

Q: When was this NPI record last updated?

The NPPES record for Grahamm Wiest was last updated on July 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 24, 2020PECOS EnrolledAccepts Medicare Assignment

26800 CROWN VALLEY PKWY STE 320, MISSION VIEJO, CA 92691(949) 365-2468 Get Directions Write a Review

NPPES record last updated: July 15, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Sep 15, 2020, Aug 24, 2020 (2 updates tracked since 2020).

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About Dr. Grahamm Wiest Psy.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GRAHAMM WIEST PSY.D. (NPI 1962015628) is an individual clinical neuropsychologist in Mission Viejo, California, licensed in California (34353) and active in the NPI registry since August 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Orange, and is a graduate of Other (2021).

NPPES Registry Identity

NPI1962015628

Entity TypeIndividualMale

Primary Taxonomy103G00000X

Provider Legal NameDR. GRAHAMM WIESTCredential: PSY.D.

Location Address26800 CROWN VALLEY PKWY STE 320Mission Viejo, CA 92691-7320

Mailing Address505 N Euclid St Ste 300Anaheim, CA 92801-5514 · (714) 871-5646

Phone(949) 365-2468

Sole ProprietorNo

Medical School CMSOtherGraduated 2021

Enumeration DateAugust 24, 2020

Last NPPES UpdateJuly 15, 20252 updates tracked since enumeration

NPPES CertifiedJuly 15, 2025

✔ NPI 1962015628 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyClinical NeuropsychologistBehavioral Health & Social Service Providers

Taxonomy Code103G00000X

License✔ Licensed in CA · 34353

Definition

A clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to normal and abnormal functioning of the central nervous system. The specialty is dedicated to enhancing the understanding of brain-behavior relationships and the application of such knowledge to human problems.

Also ListedPsychologistTaxonomy 103T00000X

26800 CROWN VALLEY PKWY STE 320, Mission Viejo, CA 92691

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Secondary Practice Location 1

Location 11110 E Chapman Ave Ste 202Orange, CA 92866-2139 · Phone (714) 744-9754

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Grahamm Wiest Psy.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3375050719

PECOS Enrollment IDI20250729004785

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JOMAN M. ALOMAR

Nurse Practitioner

26800 CROWN VALLEY PKWY STE 320
MISSION VIEJO, CA 92691

Orange County (949) 542-8002

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Grahamm Wiest's NPI number?

The NPI number for Grahamm Wiest is 1962015628. It was assigned to this individual provider in the NPPES registry on August 24, 2020.

Where is Grahamm Wiest located?

Grahamm Wiest practices at 26800 Crown Valley Pkwy Ste 320, Mission Viejo, CA 92691. The listed phone number is (949) 365-2468.

What is Grahamm Wiest's specialty?

The primary specialty registered for this NPI is Clinical Neuropsychologist with taxonomy code 103G00000X.

Is Grahamm Wiest enrolled in Medicare?

Yes. Grahamm Wiest is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Grahamm Wiest was last updated on July 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.