William Gregory Tseng, D.D.S.
General Practice Dentistry · Palo Alto, CA
William Gregory Tseng, D.D.S. is a general practice dentistry with a practice address in Palo Alto, California, and NPI 1821110412, issued on Apr 4, 2007. Check the license (California 30299, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Gregory Tseng
- Credential
- D.D.S.
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- 30299 CA
Self-reported in NPPES; status is on the state search - Practice location
- 251 High Street, Palo Alto, CA 94301
- Phone
- (650) 327-8822
- Enumerated
- Apr 4, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (650) 327-7320
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 17,852 in California → Look up another NPI →
Verify William Gregory Tseng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 30299Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average general practice dentistry in 2024
39 Medicare Part D claims for 23 beneficiaries, against an average of 83 among the 70,290 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin25 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $136.49
1 payment: gift; the largest payer was Ultradent Products Inc. The 41,669 providers of this specialty with any payment received $597.01 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William Gregory Tseng among 17,852 general practice dentistry records in California
William Gregory Tseng, D.D.S. is one of 17,852 general practice dentistry records with a practice address in California. 57% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 29% of them.
- NPI issued2007 · 29% of these records are older, 40% newer
- In a Medicare fileYes · 57% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2007 · 79% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223G0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Dentistry providers in California
There are 17,852 general practice dentistry records in California.
All 17,852 in California → Every provider in Palo Alto → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Frank Altick, DDSPalo Alto, CA 943011114056926
- Ihab Andrawess, D.M.D.Palo Alto, CA 943011033234026
- Daniel Armistead, DDSPalo Alto, CA 943011831246024
- Harvey Boyarsky, DMDPalo Alto, CA 943011336164219
- James Cox, DDSPalo Alto, CA 943011770610495
- Delores Eberhart, 10-14-1986Palo Alto, CA 943011710077847
- Denise Henderson, D.D.S.Palo Alto, CA 943011255450227
- Peter Kono, DDSPalo Alto, CA 943011215052550
Common questions
What is William Gregory Tseng, D.D.S.'s NPI number?
William Gregory Tseng, D.D.S.'s National Provider Identifier (NPI) is 1821110412, issued on Apr 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William Gregory Tseng, D.D.S. located?
The NPPES record lists a practice address at 251 High Street, Palo Alto, CA, 94301. Phone: (650) 327-8822. Providers update this record themselves, so call before visiting.
How can I verify William Gregory Tseng, D.D.S.'s license?
NPPES lists California license number 30299, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does William Gregory Tseng, D.D.S. prescribe under Medicare Part D?
In 2024, William Gregory Tseng, D.D.S. had 39 Medicare Part D claims for 23 beneficiaries; the average among general practice dentistry prescribers was 83. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.