NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Gary B. Marcus, M.D. - A Professional Corporation

Specialist in Pinole, CA · enumerated 2016 · authorized official Estella Olsen, Administrator.

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

National Provider Identifier

1902262710

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Gary B. Marcus, M.D. - A Professional Corporation
Practice address 1430 Tara Hills Dr, Suite A, Pinole, CA, 94564
Phone (510) 640-0019
Fax (510) 640-0021
Enumeration date Jan 8, 2016
Last updated in NPPES Feb 4, 2016

Taxonomy & classification

174400000X Specialist Other Service Providers · License C28611 (CA) Primary

Authorized official

Name Estella Olsen
Title Administrator
Phone (510) 734-0677

Other identifiers

Identifier Type State Issuer
1073526646 Other CA INDIVIDUAL NPI FOR GARY MARCUS, M.D.

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where is Gary B. Marcus, M.D. - A Professional Corporation located?
The practice location on file with NPPES is in Pinole, CA.
How current is this record?
Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2016-02-04. Verify at npiregistry.cms.hhs.gov.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-02-04.