Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Justin Marcus

Social Worker in Montclair, NJ · enumerated 2021.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1578136784

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Registry record

Entity type Individual (Type 1)

Name Justin Marcus

Sex Male

Practice address 51 Upper Montclair Plz Ste 27, Montclair, NJ, 07043

Phone (973) 975-8699

Enumeration date Jul 24, 2021

Last updated in NPPES Jul 24, 2021

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Justin Marcus's NPI record?

Cross-check NPI 1578136784 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1578136784 active?

Yes, as of the latest NPPES snapshot, NPI 1578136784 is active (record last updated 2021-07-24).

Other providers at this practice address

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Amy Origlieri Clinical Psychologist · Montclair, NJ NPI 1841642444 Jessyka Lombana Clinical Social Worker · Montclair, NJ NPI 1427648336 Jill Sohn Mental Health Counselor · Montclair, NJ NPI 1427789452 Shoshana Richter Psychologist · Montclair, NJ NPI 1881459717 Basya Gruber Social Worker · Montclair, NJ NPI 1508724683

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-24.