Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Preston R Simpson, MD

Clinical Pathology/Laboratory Medicine Physician in Fresno, CA · enumerated 2006.

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

National Provider Identifier

1265453021

Verified

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Registry record

Entity type Individual (Type 1)

Name Preston R Simpson

Credential MD

Sex Male

Practice address 1303 E Herndon Ave, Fresno, CA, 93720

Phone (559) 449-5360

Fax (559) 449-3347

Enumeration date Jul 21, 2006

Last updated in NPPES May 29, 2008

Taxonomy & licenses

207ZP0105X Clinical Pathology/Laboratory Medicine Physician Allopathic & Osteopathic Physicians · License G58006 (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
00G580060	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

Where does Preston Simpson practice?

The practice location on file with NPPES is in Fresno, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Preston Simpson?

The National Provider Identifier (NPI) for Preston Simpson is 1265453021, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-05-29.