Robert C. Williams, DDS
General Practice Dentistry · Angwin, CA
Robert C. Williams, DDS is a general practice dentistry with a practice address in Angwin, California, and NPI 1336268077, issued on Mar 27, 2007. Check the license (California 21293, 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
- Robert C. Williams
- Credential
- DDS
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- 21293 CA
Self-reported in NPPES; status is on the state search - Practice location
- 41 Angwin Plaza, Angwin, CA 94508
- Phone
- (707) 965-2479
- Enumerated
- Mar 27, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (707) 965-0427
- Medicare enrollment
- Enrolled (PECOS I20110818000628); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Dentistry, 1970
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 17,852 in California → Look up another NPI →
Also registered at 41 Angwin Plaza
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Peter Vandenhoven, DDSGeneral Practice Dentistry1770652588
Verify Robert C. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 21293Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Robert C. Williams among 17,852 general practice dentistry records in California
Robert C. Williams, DDS 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 fileYes · under 1% of these records are
- Graduated1970 · median 2009 among the 95 with a school on file
- 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).
2 general practice dentistry records list a practice address in Angwin
They are 2 of the 22 NPPES records with a practice address in Angwin, 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 Angwin → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Peter Vandenhoven, DDSAngwin, CA 945081770652588
- Liza AroraAlamo, CA 945071205406824
- David Brown, D.D.S.Antioch, CA 945091467506303
- Daniel Burk, D.D.S.Antioch, CA 945091396894432
- David Campos, DDSAntioch, CA 945091073615167
- Antonia Cyrus, D.D.S.Alamo, CA 945071689864639
- Daniel Gavan, DMDAlamo, CA 945071235861816
- Lara Kachachi, D.D.S.Alamo, CA 945071013372408
Common questions
What is Robert C. Williams, DDS's NPI number?
Robert C. Williams, DDS's National Provider Identifier (NPI) is 1336268077, issued on Mar 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Robert C. Williams, DDS located?
The NPPES record lists a practice address at 41 Angwin Plaza, Angwin, CA, 94508. Phone: (707) 965-2479. Providers update this record themselves, so call before visiting.
How can I verify Robert C. Williams, DDS's license?
NPPES lists California license number 21293, 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.