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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

SYDNEY PRESTON M.S., CCC-SLP
NPI 1790201879
Speech-Language Pathologist in San Dimas, CA

Active since August 21, 2017
1314 W GLADSTONE ST, SAN DIMAS, CA 91773(909) 971-8204 Get Directions Write a Review

NPPES record last updated: August 7, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Aug 7, 2026, Jul 8, 2026, Aug 21, 2017 (3 updates tracked since 2017).

About Sydney Preston M.s., Ccc-slp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SYDNEY PRESTON M.S., CCC-SLP (NPI 1790201879) is an individual speech-language pathologist provider in San Dimas, California, licensed in California (31160) and active in the NPI registry since August 2017.

NPPES Registry Identity

NPI1790201879
Entity TypeIndividualFemale
Primary Taxonomy235Z00000X
Provider Legal NameSYDNEY PRESTONCredential: M.S., CCC-SLP
Location Address1314 W GLADSTONE STSan Dimas, CA 91773-1611
Mailing Address1314 W Gladstone StSan Dimas, CA 91773-1611 · (909) 971-8204
Phone(909) 971-8204
Sole ProprietorYes
Enumeration DateAugust 21, 2017
Last NPPES UpdateAugust 7, 20263 updates tracked since enumeration
NPPES CertifiedAugust 7, 2026
✔ NPI 1790201879 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpeech-Language PathologistSpeech, Language and Hearing Service Providers
Taxonomy Code235Z00000X
License✔ Licensed in CA · 31160
Definition
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.
1314 W GLADSTONE ST, San Dimas, CA 91773
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Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JERILYN OTTO
Speech-Language Pathologist
1314 W GLADSTONE ST
SAN DIMAS, CA 91773
Los Angeles County (909) 971-8204

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Sydney Preston's NPI number?

The NPI number for Sydney Preston is 1790201879. It was assigned to this individual provider in the NPPES registry on August 21, 2017.

Where is Sydney Preston located?

Sydney Preston practices at 1314 W Gladstone St, San Dimas, CA 91773. The listed phone number is (909) 971-8204.

What is Sydney Preston's specialty?

The primary specialty registered for this NPI is Speech-Language Pathologist with taxonomy code 235Z00000X.

When was this NPI record last updated?

The NPPES record for Sydney Preston was last updated on August 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.