Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Benjamin Wolsztejn, MD Inc

Obstetrics & Gynecology Physician in Castro Valley, CA · enumerated 2006 · authorized official Benjamin Wolsztejn, President.

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

National Provider Identifier

1316959299

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Registry record

Entity type Organization (Type 2)

Legal business name Benjamin Wolsztejn, MD Inc

Practice address 20130 Lake Chabot Rd, Suite 306, Castro Valley, CA, 94546

Phone (510) 581-7666

Enumeration date Aug 12, 2006

Last updated in NPPES Jul 11, 2007

Taxonomy & classification

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License A24169 (CA) Primary

Authorized official

Name Benjamin Wolsztejn

Title President

Phone (510) 581-7666

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 2007-07-11. Verify at npiregistry.cms.hhs.gov.

Where is Benjamin Wolsztejn, MD Inc located?

The practice location on file with NPPES is in Castro Valley, CA.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-11.