Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Marshak Medical Group Inc

Adolescent Medicine (Family Medicine) Physician in Los Angeles, CA · enumerated 2007 · authorized official Herbert Marshak, M.D..

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

National Provider Identifier

1770604779

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Registry record

Entity type Organization (Type 2)

Legal business name Marshak Medical Group Inc

Practice address 3484 E 1st St, Los Angeles, CA, 90063

Phone (323) 268-4436

Fax (323) 264-3049

Enumeration date Apr 3, 2007

Last updated in NPPES Jul 14, 2015

Taxonomy & classification

207QA0000X Adolescent Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License A29118 (CA) Primary

Authorized official

Name Herbert Marshak

Title M.D.

Phone (323) 268-4436

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 current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2015-07-14. Verify at npiregistry.cms.hhs.gov.

Where is Marshak Medical Group Inc located?

The practice location on file with NPPES is in Los Angeles, CA.

Providers at this address

Browse all →

Sidney Marshak Family Medicine Physician · Los Angeles, CA NPI 1790851780 Marshak Medical Group, Inc Non-Pharmacy Dispensing Site · Los Angeles, CA NPI 1487969689 One West Medical Group Internal Medicine Physician · Los Angeles, CA NPI 1134666811

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-14.