Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William G Preston, MD

Neurology Physician in Laguna Hills, CA · enumerated 2006.

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

National Provider Identifier

1376583922

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name William G Preston

Credential MD

Sex Male

Practice address 23961 Calle De La Magdalena, Suite 317, Laguna Hills, CA, 92653

Phone (949) 837-1130

Fax (949) 581-9189

Enumeration date Jun 8, 2006

Last updated in NPPES Jun 22, 2010

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License G22862 (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
00G228620	Other	CA	MEDI-CAL PROVIDER #

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 do I verify William Preston's NPI record?

Cross-check NPI 1376583922 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1376583922 active?

Yes, as of the latest NPPES snapshot, NPI 1376583922 is active (record last updated 2010-06-22).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-22.