Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gilbert H. Zimmerman, MD

Diagnostic Radiology Physician in Riverside, CA · enumerated 2005.

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

National Provider Identifier

1083615793

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Registry record

Entity type Individual (Type 1)

Name Gilbert H. Zimmerman

Credential MD

Sex Male

Practice address 4445 Magnolia Ave, Riverside, CA, 92501

Phone (951) 788-3400

Fax (851) 788-3194

Enumeration date Aug 3, 2005

Last updated in NPPES Jun 17, 2008

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License G18448 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
00G184480	Medicaid	CA	-
009184480	Medicaid	CA	-

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

Is NPI 1083615793 active?

Yes, as of the latest NPPES snapshot, NPI 1083615793 is active (record last updated 2008-06-17).

How do I verify Gilbert Zimmerman's NPI record?

Cross-check NPI 1083615793 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-17.