Ellen To

Ellen To is a Pharmacist provider (Pharmacist) practicing in Fullerton, CA, registered in the NPPES registry with NPI 1558644278 since 2011. Practices at Walgreen Co (listed at the same practice address in NPPES).

✓ Active NPI ✓ Valid NPI checksum

NPI	1558644278
Entity type	Individual (Type 1)
Name	Ellen To
Sex	Female
Practice address	1250 E CHAPMAN AVE, Fullerton, CA, 92831
Phone	7146809124
Enumeration date	2011-09-20
Last updated in NPPES	2011-12-14

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
183500000X	Pharmacist	Primary	55847	CA

Copy-ready billing details

Provider: Ellen To
NPI: 1558644278
Taxonomy: 183500000X (Pharmacist)
Address: 1250 E CHAPMAN AVE, Fullerton, CA, 92831

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1497760789	Walgreen Co	Organization	Pharmacy	Fullerton, CA
1952683096	Kathelen Nguyen	Individual	Pharmacist	Fullerton, CA
1194002352	Deborah Chow	Individual	Pharmacist	Fullerton, CA
1972870830	Earl Sato	Individual	Pharmacist	Fullerton, CA
1417497769	Minh Vong	Individual	Pharmacist	Fullerton, CA
1265947360	Naty Long	Individual	Pharmacist	Fullerton, CA
1740087857	Pedro Concepcion	Individual	Pharmacy Technician	Fullerton, CA

Verify this record

Cross-check NPI 1558644278 against the authoritative CMS record: view Ellen To 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

What specialty is Ellen To?

Ellen To is registered in NPPES with the primary taxonomy of Pharmacist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2011-12-14.