DR. WILLIAM GREGORY TSENG D.D.S.
NPI 1821110412
Dentist - General Practice in Palo Alto, CA

Q: What is William Tseng's NPI number?

The NPI number for William Tseng is 1821110412. It was assigned to this individual provider in the NPPES registry on April 4, 2007.

Q: What is William Tseng'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 William Tseng was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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 April 04, 2007PECOS Enrolled

251 HIGH STREET, SUITE A, PALO ALTO, CA 94301(650) 327-8822(650) 327-7320 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Dr. William Gregory Tseng D.d.s. NPPES

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

DR. WILLIAM GREGORY TSENG D.D.S. (NPI 1821110412) is an individual general practice provider in Palo Alto, California, licensed in California (30299) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1821110412

Entity TypeIndividualMale

Primary Taxonomy1223G0001X

Provider Legal NameDR. WILLIAM GREGORY TSENGCredential: D.D.S.

Location Address251 HIGH STREET, SUITE APalo Alto, CA 94301-1041

Mailing Address251 High Street, Suite APalo Alto, CA 94301-1041 · (650) 327-8822 · Fax (650) 327-7320

Phone(650) 327-8822

Fax(650) 327-7320

Sole ProprietorYes

Enumeration DateApril 4, 2007

Last NPPES UpdateJuly 8, 2007

✔ NPI 1821110412 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 · 30299

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.

251 HIGH STREET, Palo Alto, CA 94301

Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. William Gregory Tseng D.d.s. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94301 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$106.47 typical visit price

range $70.37 – $206.04

Typical copayment $26.61 (range $17.59 – $51.51)

Most-billed visit code 99203

Established Patient

$86.56 typical visit price

range $23.96 – $169.60

Typical copayment $21.64 (range $5.99 – $42.40)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 William Tseng's NPI number?

The NPI number for William Tseng is 1821110412. It was assigned to this individual provider in the NPPES registry on April 4, 2007.

Where is William Tseng located?

William Tseng practices at 251 High Street Suite A, Palo Alto, CA 94301. The listed phone number is (650) 327-8822.

What is William Tseng's specialty?

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

Is William Tseng enrolled in Medicare?

Yes. William Tseng is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for William Tseng was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.