JUSTINE DUYST PSYD
NPI 1639961964
Psychologist - Clinical in Pasadena, CA

Q: What is Justine Duyst's NPI number?

The NPI number for Justine Duyst is 1639961964. It was assigned to this individual provider in the NPPES registry on May 21, 2025.

Q: What is Justine Duyst's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Q: Is Justine Duyst enrolled in Medicare?

No. Justine Duyst has opted out of Medicare through January 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out.

Q: When was this NPI record last updated?

The NPPES record for Justine Duyst was last updated on May 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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 May 21, 2025Opted out of Medicare · through Jan 1, 2027

416 SANTA PAULA AVE, PASADENA, CA 91107(559) 991-5750 Get Directions Write a Review

NPPES record last updated: May 21, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

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About Justine Duyst Psyd NPPES

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

JUSTINE DUYST PSYD (NPI 1639961964) is an individual clinical provider in Pasadena, California, licensed in California (PSY35549) and active in the NPI registry since May 2025. She has opted out of Medicare through January 1, 2027.

NPPES Registry Identity

NPI1639961964

Entity TypeIndividualFemale

Primary Taxonomy103TC0700X

Provider Legal NameJUSTINE DUYSTCredential: PSYD

Location Address416 SANTA PAULA AVEPasadena, CA 91107-2931

Mailing Address416 Santa Paula AvePasadena, CA 91107-2931 · (559) 991-5750

Phone(559) 991-5750

Sole ProprietorNo

Enumeration DateMay 21, 2025

NPPES CertifiedMay 21, 2025

✔ NPI 1639961964 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code103TC0700X

License✔ Licensed in CA · PSY35549

Definition

A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

416 SANTA PAULA AVE, Pasadena, CA 91107

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Justine Duyst Psyd 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 January 1, 2025 through January 1, 2027.

Opt-Out Effective DateJanuary 1, 2025

Opt-Out In Effect ThroughJanuary 1, 2027Opt-out affidavits renew automatically every two years unless cancelled

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 Justine Duyst's NPI number?

The NPI number for Justine Duyst is 1639961964. It was assigned to this individual provider in the NPPES registry on May 21, 2025.

Where is Justine Duyst located?

Justine Duyst practices at 416 Santa Paula Ave, Pasadena, CA 91107. The listed phone number is (559) 991-5750.

What is Justine Duyst's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Justine Duyst enrolled in Medicare?

No. Justine Duyst has opted out of Medicare through January 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out.

When was this NPI record last updated?

The NPPES record for Justine Duyst was last updated on May 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.