James Yoshitatsu Kobayashi, D.D.S.
General Practice Dentistry · Danville, CA
James Yoshitatsu Kobayashi, D.D.S. is a general practice dentistry with a practice address in Danville, California, and NPI 1942391909, issued on Sep 27, 2006. Check the license (California 21600, 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.
- Name
- James Yoshitatsu Kobayashi
- Credential
- D.D.S.
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- 21600 CA
Self-reported in NPPES; status is on the state search - Practice location
- 318 Diablo RD, Danville, CA 94526
- Phone
- (925) 820-1221
- Enumerated
- Sep 27, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (925) 820-1910
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 17,852 in California → Look up another NPI →
Verify James Yoshitatsu Kobayashi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 21600Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
James Yoshitatsu Kobayashi among 17,852 general practice dentistry records in California
James Yoshitatsu Kobayashi, 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 2006, is newer than 3% of them.
- NPI issued2006 · 3% of these records are older, 71% 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).
34 general practice dentistry records list a practice address in Danville
They are 34 of the 897 NPPES records with a practice address in Danville, 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 Danville → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Cheryl Allan, DDSDanville, CA 945261396854923
- James Giblin, D.D.S.Danville, CA 945261609896141
- David Graham, DDSDanville, CA 945261861502957
- Dino Javaheri, D.D.SDanville, CA 945261366457111
- Melanie Koehler, DDSDanville, CA 945261265538334
- Mark Koenen, DDSDanville, CA 945261023111952
- Douglas Lins, D.D.S.Danville, CA 945261407942964
- Robert Morrish, DDSDanville, CA 945261346332673
Common questions
What is James Yoshitatsu Kobayashi, D.D.S.'s NPI number?
James Yoshitatsu Kobayashi, D.D.S.'s National Provider Identifier (NPI) is 1942391909, issued on Sep 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Yoshitatsu Kobayashi, D.D.S. located?
The NPPES record lists a practice address at 318 Diablo RD, Danville, CA, 94526. Phone: (925) 820-1221. Providers update this record themselves, so call before visiting.
How can I verify James Yoshitatsu Kobayashi, D.D.S.'s license?
NPPES lists California license number 21600, 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.
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.