Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

COLIN HOLTZINGER PSYD
NPI 1437630803
Psychologist - Clinical in San Francisco, CA

Q: What is Colin Holtzinger's NPI number?

The NPI number for Colin Holtzinger is 1437630803. It was assigned to this individual provider in the NPPES registry on August 23, 2018.

Q: What is Colin Holtzinger's specialty?

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

Q: Is Colin Holtzinger enrolled in Medicare?

No. Colin Holtzinger has opted out of Medicare through March 25, 2028. 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 Colin Holtzinger was last updated on July 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 57 days 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 23, 2018Opted out of Medicare · through Mar 25, 2028

2383 CALIFORNIA ST STE 3, SAN FRANCISCO, CA 94115(415) 286-5258 Get Directions Write a Review

NPPES record last updated: July 11, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

Record update history: Jul 11, 2026, Aug 23, 2018 (2 updates tracked since 2018).

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About Colin Holtzinger Psyd NPPES

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

COLIN HOLTZINGER PSYD (NPI 1437630803) is an individual clinical provider in San Francisco, California, licensed in California (PSY34174) and active in the NPI registry since August 2018. He has opted out of Medicare through March 25, 2028.

NPPES Registry Identity

NPI1437630803

Entity TypeIndividualMale

Primary Taxonomy103TC0700X

Provider Legal NameCOLIN HOLTZINGERCredential: PSYD

Location Address2383 CALIFORNIA ST STE 3San Francisco, CA 94115-2750

Mailing Address2383 California St Ste 3San Francisco, CA 94115-2750 · (415) 286-5258

Phone(415) 286-5258

Sole ProprietorYes

Enumeration DateAugust 23, 2018

Last NPPES UpdateJuly 11, 20262 updates tracked since enumeration

NPPES CertifiedJuly 11, 2026

✔ NPI 1437630803 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 · PSY34174

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.

2383 CALIFORNIA ST STE 3, San Francisco, CA 94115

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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

Colin Holtzinger 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 March 25, 2024 through March 25, 2028.

Opt-Out Effective DateMarch 25, 2024

Opt-Out In Effect ThroughMarch 25, 2028Opt-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 Colin Holtzinger's NPI number?

The NPI number for Colin Holtzinger is 1437630803. It was assigned to this individual provider in the NPPES registry on August 23, 2018.

Where is Colin Holtzinger located?

Colin Holtzinger practices at 2383 California St Ste 3, San Francisco, CA 94115. The listed phone number is (415) 286-5258.

What is Colin Holtzinger's specialty?

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

Is Colin Holtzinger enrolled in Medicare?

No. Colin Holtzinger has opted out of Medicare through March 25, 2028. 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 Colin Holtzinger was last updated on July 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 57 days 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.