Preston R Simpson, MD

Preston R Simpson is a Clinical Pathology/Laboratory Medicine Physician provider (Pathology) practicing in Fresno, CA, registered in the NPPES registry with NPI 1265453021 since 2006. The credential MD stands for Doctor of Medicine.

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NPI	1265453021
Entity type	Individual (Type 1)
Name	Preston R Simpson
Credential	MD
Sex	Male
Practice address	1303 E HERNDON AVE, Fresno, CA, 93720
Phone	5594495360
Fax	5594493347
Enumeration date	2006-07-21
Last updated in NPPES	2008-05-29

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
207ZP0105X	Clinical Pathology/Laboratory Medicine Physician	Primary	G58006	CA

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	—

Copy-ready billing details

Provider: Preston Simpson, MD
NPI: 1265453021
Taxonomy: 207ZP0105X (Clinical Pathology/Laboratory Medicine Physician)
Address: 1303 E HERNDON AVE, Fresno, CA, 93720

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1609792027	Tanya Thakur	Individual	Student in an Organized Health Care Education/Training Program	Fresno, CA
1700883006	George Saul	Individual	Critical Care Medicine (Internal Medicine) Physician	Fresno, CA
1528066560	Andreas Heller	Individual	Hospitalist Physician	Fresno, CA
1952382095	Mark Hafner	Individual	Anesthesiology Physician	Fresno, CA
1487632865	Dennis Bethel	Individual	Emergency Medicine Physician	Fresno, CA
1023068798	Valley Nuclear Medical Group	Organization	Nuclear Imaging & Therapy Physician	Fresno, CA
1780635508	Mark Bernard	Individual	Nuclear Medicine Physician	Fresno, CA
1912958620	David Claypool	Individual	Emergency Medicine Physician	Fresno, CA

Verify this record

Cross-check NPI 1265453021 against the authoritative CMS record: view Preston R Simpson on the official NPPES registry .

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 or validate an NPI number.

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.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2008-05-29.