NPPES file of Aug 9, 2026

Gregory Alan Hong, D.D.S.

General Practice Dentistry · Castro Valley, CA

Gregory Alan Hong, D.D.S. is a general practice dentistry with a practice address in Castro Valley, California, and NPI 1912051905, issued on Jan 23, 2007. Check the license (California 034496, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1912051905
Name
Gregory Alan Hong
Credential
D.D.S.
Primary taxonomy
General Practice Dentistry 1223G0001X
License number
034496 CA
Self-reported in NPPES; status is on the state search
Practice location
20353 Lake Chabot RD, Castro Valley, CA 94546
Phone
(510) 581-2102
Enumerated
Jan 23, 2007
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(510) 581-2321
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest general practice dentistry records → All 17,852 in California → Look up another NPI →

Also registered at 20353 Lake Chabot RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Christopher Corzine, PHARMDPharmacist1326496795
  2. Sudhir Reddy, PHARM DAmbulatory Care Pharmacist1043761877
  3. Edwin Tjan, DDSGeneral Practice Dentistry1396903639

Verify Gregory Alan Hong in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 034496    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

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Gregory Alan Hong among 17,852 general practice dentistry records in California

Gregory Alan Hong, 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 not. Its NPI, issued in 2007, is newer than 29% of them.

  • NPI issued2007 · 29% of these records are older, 40% newer
  • In a Medicare fileNo · 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).

24 general practice dentistry records list a practice address in Castro Valley

They are 24 of the 999 NPPES records with a practice address in Castro Valley, and 17,852 general practice dentistry records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 17,852 in California → Every provider in Castro Valley → General Practice Dentistry nationwide →

The 8 general practice dentistry records with the nearest ZIP codes

  1. Bruce Ahtye, D.D.S.Castro Valley, CA 945461528147600
  2. John Berk, D.D.S.Castro Valley, CA 945461770507675
  3. Robert Darnell, D.D.S.Castro Valley, CA 945461144316993
  4. Jeffrey Erickson, D.D.SCastro Valley, CA 945461053451435
  5. Robert Maass, DDSCastro Valley, CA 945461205989415
  6. George Mackenzie, DDSCastro Valley, CA 945461114070315
  7. Robert Oneill, DDSCastro Valley, CA 945461659593366
  8. Shirin Salehinia, D.D.SCastro Valley, CA 945461851444962

Common questions

What is Gregory Alan Hong, D.D.S.'s NPI number?

Gregory Alan Hong, D.D.S.'s National Provider Identifier (NPI) is 1912051905, issued on Jan 23, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Gregory Alan Hong, D.D.S. located?

The NPPES record lists a practice address at 20353 Lake Chabot RD, Castro Valley, CA, 94546. Phone: (510) 581-2102. Providers update this record themselves, so call before visiting.

How can I verify Gregory Alan Hong, D.D.S.'s license?

NPPES lists California license number 034496, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.