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DR. GILLIAN REIERSON M.D. PH.D.
NPI 1003178641
Psychiatry & Neurology - Psychiatry in Walnut Creek, CA

Active since June 11, 2012Opted out of Medicare · through Oct 18, 2026
2970 CAMINO DIABLO FL 1, WALNUT CREEK, CA 94597(925) 360-5264 Get Directions Write a Review

NPPES record last updated: September 27, 2018. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Gillian Reierson M.d. Ph.d. NPPES

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

DR. GILLIAN REIERSON M.D. PH.D. (NPI 1003178641) is an individual psychiatry provider in Walnut Creek, California, licensed in California (A126534) and active in the NPI registry since June 2012. She has opted out of Medicare through October 18, 2026 and remains eligible to order and refer.

NPPES Registry Identity

NPI1003178641
Entity TypeIndividualFemale
Primary Taxonomy2084P0800X
Provider Legal NameDR. GILLIAN REIERSONCredential: M.D. PH.D.
Location Address2970 CAMINO DIABLO FL 1Walnut Creek, CA 94597
Mailing Address2970 Camino Diablo Fl 1Walnut Creek, CA 94597-4001
Phone(925) 360-5264
Sole ProprietorYes
Enumeration DateJune 11, 2012
Last NPPES UpdateSeptember 27, 2018
✔ NPI 1003178641 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A126534
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
Also ListedPsychiatry & Neurology · Child & Adolescent PsychiatryTaxonomy 2084P0804X · License A126534 (CA)
2970 CAMINO DIABLO FL 1, Walnut Creek, CA 94597
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Gillian Reierson M.d. Ph.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from October 18, 2018 through October 18, 2026.

Opt-Out Effective DateOctober 18, 2018
Opt-Out In Effect ThroughOctober 18, 2026Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94597 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$202.35 typical visit price
range $69.00 – $202.35
Typical copayment $50.58 (range $17.25 – $50.58)
Most-billed visit code 99205
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Gillian Reierson's NPI number?

The NPI number for Gillian Reierson is 1003178641. It was assigned to this individual provider in the NPPES registry on June 11, 2012.

Where is Gillian Reierson located?

Gillian Reierson practices at 2970 Camino Diablo Fl 1, Walnut Creek, CA 94597. The listed phone number is (925) 360-5264.

What is Gillian Reierson's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Gillian Reierson enrolled in Medicare?

No. Gillian Reierson has opted out of Medicare through October 18, 2026. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Gillian Reierson was last updated on September 27, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years 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.