Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

County of San Diego

Q: What is the NPI number for County of San Diego?

The NPI for County of San Diego is 1245251297, a Type 2 (organization) record in the CMS NPPES registry.

Institutional Pharmacy in San Diego, CA · enumerated 2006 · authorized official William Mastin, Chief Pharmacist.

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

National Provider Identifier

1245251297

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Registry record

Entity type Organization (Type 2)

Legal business name County of San Diego

Other name <Unavail>

Practice address 3851 Rosecrans St, San Diego, CA, 92110

Phone (619) 692-5741

Fax (619) 692-8034

Enumeration date Jul 22, 2006

Last updated in NPPES Apr 13, 2016

Taxonomy & classification

3336I0012X Institutional Pharmacy Suppliers · License HPE35645 (CA) Primary

Authorized official

Name William Mastin

Title Chief Pharmacist

Phone (619) 692-5600

Other identifiers

Identifier	Type	State	Issuer
2088118	Other	-	PK

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

Who is the authorized official for County of San Diego?

NPPES lists William Mastin (Chief Pharmacist) as the authorized official for this organization.

What is the NPI number for County of San Diego?

The NPI for County of San Diego is 1245251297, a Type 2 (organization) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-04-13.