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

DR. MARK RALPH SYLVESTER D.D.S.
NPI 1851396733
Dentist - General Practice in Hayward, CA

Q: What is Mark Sylvester's NPI number?

The NPI number for Mark Sylvester is 1851396733. It was assigned to this individual provider in the NPPES registry on June 16, 2005.

Q: What is Mark Sylvester's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

Q: When was this NPI record last updated?

The NPPES record for Mark Sylvester was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 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.

Active since June 16, 2005

1680 B ST, STE A, HAYWARD, CA 94541(510) 581-8366(510) 581-8382 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Dr. Mark Ralph Sylvester D.d.s. NPPES

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

DR. MARK RALPH SYLVESTER D.D.S. (NPI 1851396733) is an individual general practice provider in Hayward, California, licensed in California (23568) and active in the NPI registry since June 2005.

NPPES Registry Identity

NPI1851396733

Entity TypeIndividualMale

Primary Taxonomy1223G0001X

Provider Legal NameDR. MARK RALPH SYLVESTERCredential: D.D.S.

Location Address1680 B ST, STE AHayward, CA 94541-3040

Mailing Address25500 Dario TerHayward, CA 94541-5630 · (510) 538-2395

Phone(510) 581-8366

Fax(510) 581-8382

Sole ProprietorNo

Enumeration DateJune 16, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1851396733 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers

Taxonomy Code1223G0001X

License✔ Licensed in CA · 23568

Definition

A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.

1680 B ST, Hayward, CA 94541

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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 Mark Sylvester's NPI number?

The NPI number for Mark Sylvester is 1851396733. It was assigned to this individual provider in the NPPES registry on June 16, 2005.

Where is Mark Sylvester located?

Mark Sylvester practices at 1680 B St Ste A, Hayward, CA 94541. The listed phone number is (510) 581-8366.

What is Mark Sylvester's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

When was this NPI record last updated?

The NPPES record for Mark Sylvester was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 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.