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

NORTHSIDE PSYCHOLOGY
NPI 1124909155
Psychologist - Clinical in Sleepy Hollow, NY

Active since September 08, 2025
16 KINGSLAND RD, SLEEPY HOLLOW, NY 10591(213) 444-3633(332) 600-8652 Get Directions Write a Review

NPPES record last updated: August 4, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Aug 4, 2026, Jul 23, 2026, Sep 8, 2025 (3 updates tracked since 2025).

About Northside Psychology NPPES

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

NORTHSIDE PSYCHOLOGY (NPI 1124909155) is a healthcare organization registered as a clinical in Sleepy Hollow, New York and active in the NPI registry since September 2025. The organization maintains a secondary practice location in Santa Barbara and lists David Mahony, Owner, as its authorized official.

NPPES Registry Identity

NPI1124909155
Entity TypeOrganization
Primary Taxonomy103TC0700X
Legal Business NameNORTHSIDE PSYCHOLOGY
Location Address16 KINGSLAND RDSleepy Hollow, NY 10591-1022
Mailing Address16 Kingsland RdSleepy Hollow, NY 10591-1022 · (718) 668-1919 · Fax (332) 600-8652
Phone(213) 444-3633
Fax(332) 600-8652
Organization SubpartNo
Authorized OfficialDavid MahonyOwner · (718) 668-1919
Enumeration DateSeptember 8, 2025
Last NPPES UpdateAugust 4, 20263 updates tracked since enumeration
NPPES CertifiedAugust 4, 2026
✔ NPI 1124909155 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
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.
16 KINGSLAND RD, Sleepy Hollow, NY 10591
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Secondary Practice Location 1

Location 1351 Paseo NuevoSanta Barbara, CA 93101-3382 · Phone (213) 444-3633

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

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 Northside Psychology's NPI number?

The NPI number for Northside Psychology is 1124909155. It was assigned to this organization in the NPPES registry on September 8, 2025.

Where is Northside Psychology located?

Northside Psychology is located at 16 Kingsland Rd, Sleepy Hollow, NY 10591. The listed phone number is (213) 444-3633.

What is Northside Psychology's specialty?

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

When was this NPI record last updated?

The NPPES record for Northside Psychology was last updated on August 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.