NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Advanced Gastroenterology, Inc.

Gastroenterology Physician in Thousand Oaks, CA · enumerated 2007 · authorized official Gilbert Simoni, Owner.

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

National Provider Identifier

1497970875

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Advanced Gastroenterology, Inc.
Other name <Unavail>
Practice address 555 Marin St Ste 270, Thousand Oaks, CA, 91360
Phone (805) 719-0244
Fax (805) 777-1730
Enumeration date Apr 13, 2007
Last updated in NPPES Feb 11, 2025

Taxonomy & classification

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License A77140 (CA) Primary

Authorized official

Name Gilbert Simoni
Title Owner
Phone (805) 719-0244

Other identifiers

Identifier Type State Issuer
W20758 Other CA MEDICARE GROUP ID

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

How current is this record?
Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2025-02-11. Verify at npiregistry.cms.hhs.gov.
Where is Advanced Gastroenterology, Inc. located?
The practice location on file with NPPES is in Thousand Oaks, CA.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-11.