Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Rex L.C. Chu, O.D.
Optometrist in Chino, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1588694137
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Registry record
Entity type Individual (Type 1)
Name Dr. Rex L.C. Chu
Credential O.D.
Sex Male
Practice address 13788 Roswell Ave, #106, Chino, CA, 91710
Phone (909) 627-5598
Fax (909) 627-5298
Enumeration date Jul 3, 2006
Last updated in NPPES Dec 6, 2021
Taxonomy & licenses
152WC0802X Corneal and Contact Management Optometrist Eye and Vision Services Providers · License OPT 11120TPA (CA) Secondary
152WL0500X Low Vision Rehabilitation Optometrist Eye and Vision Services Providers · License OPT 11120TPA (CA) Secondary
152WP0200X Pediatric Optometrist Eye and Vision Services Providers · License OPT 11120TPA (CA) Secondary
152WS0006X Sports Vision Optometrist Eye and Vision Services Providers · License OPT 11120TPA (CA) Secondary
152WV0400X Vision Therapy Optometrist Eye and Vision Services Providers · License OPT 11120TPA (CA) Secondary
152WX0102X Occupational Vision Optometrist Eye and Vision Services Providers · License OPT 11120TPA (CA) Secondary
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
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.
Frequently asked questions
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.
What specialty is Rex Chu?
Rex Chu 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.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-06.