Dr. William P Breen, OD

Dr. William P Breen is a Optometrist provider (Optometrist) practicing in Centennial, CO, registered in the NPPES registry with NPI 1225114002 since 2006. The credential OD stands for Doctor of Optometry. Practices at John L Schachet Od PC (listed at the same practice address in NPPES).

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NPI	1225114002
Entity type	Individual (Type 1)
Name	Dr. William P Breen
Credential	OD
Sex	Male
Practice address	8586 E ARAPAHOE RD, STE 100, Centennial, CO, 80112
Phone	3037714221
Fax	3037217759
Enumeration date	2006-10-27
Last updated in NPPES	2014-09-03

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
152W00000X	Optometrist	Primary	916	CO
152WC0802X	Corneal and Contact Management Optometrist	Secondary	916	CO
152WP0200X	Pediatric Optometrist	Secondary	916	CO

OD — Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Copy-ready billing details

Provider: William Breen, OD
NPI: 1225114002
Taxonomy: 152W00000X (Optometrist)
Address: 8586 E ARAPAHOE RD, STE 100, Centennial, CO, 80112

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1851477681	Vasi Alevras-Sztukowski	Individual	Corneal and Contact Management Optometrist	Centennial, CO
1396821146	Ivan Grupe	Individual	Optometrist	Centennial, CO
1699850412	John Schachet	Individual	Corneal and Contact Management Optometrist	Centennial, CO
1245497452	John L Schachet Od PC	Organization	Corneal and Contact Management Optometrist	Centennial, CO

Verify this record

Cross-check NPI 1225114002 against the authoritative CMS record: view Dr. William P Breen 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 William Breen?

William Breen is registered in NPPES with the primary taxonomy of Optometrist. 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 2014-09-03.