Steven Mark Williams, D.M.D.
Endodontics · Livermore, CA
Steven Mark Williams, D.M.D. is an endodontics with a practice address in Livermore, California, and NPI 1780867820, issued on Dec 12, 2007. Check the license (California 39912, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Steven Mark Williams
- Credential
- D.M.D.
- Primary taxonomy
- Endodontics 1223E0200X
- License number
- 39912 CA
Self-reported in NPPES; status is on the state search - Practice location
- 999 E Stanley Blvd, Livermore, CA 94550
- Phone
- (925) 371-0300
- Enumerated
- Dec 12, 2007
- Record last updated
- Dec 12, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (925) 371-0800
- Entity
- Type 1 · individual
8 nearest endodontics records → All 1,018 in California → Look up another NPI →
Also registered at 999 E Stanley Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anthony Alvarez, DDSDentist1710916192
- Max Hsiao, DMDGeneral Practice Dentistry1336099928
- Harley Williams, D.M.D.Periodontics1013190255
Verify Steven Mark 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 39912Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% more Medicare Part D claims than the average endodontics in 2024
190 Medicare Part D claims for 84 beneficiaries, against an average of 121 among the 4,119 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin71 claims
- Ibuprofen55 claims
- Sulfamethoxazole-Trimethoprim14 claims
- Clindamycin Hcl11 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.
Steven Mark Williams among 1,018 endodontics records in California
Steven Mark Williams, D.M.D. is one of 1,018 endodontics records with a practice address in California. 68% 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 27% of them.
- NPI issued2007 · 27% of these records are older, 42% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2007 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223E0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endodontics providers in California
There are 1,018 endodontics records in California.
All 1,018 in California → Every provider in Livermore → Endodontics nationwide →
The 8 endodontics records with the nearest ZIP codes
- Justin FangLivermore, CA 945501538793526
- Paul Vignaroli, D.D.SLivermore, CA 945501679799233
- Ryan Yamanaka, DDSLivermore, CA 945501912111261
- Brett Cole, DDSLafayette, CA 945491700051893
- Yas Dastmalchi, DDSLafayette, CA 945491063580702
- Hermon Bhullar, DDSHercules, CA 945471346474087
- Valentine Sviatocha, DDSMartinez, CA 945531972881068
- Robert Hanson, D.D.S.Napa, CA 945581245363779
Common questions
What is Steven Mark Williams, D.M.D.'s NPI number?
Steven Mark Williams, D.M.D.'s National Provider Identifier (NPI) is 1780867820, issued on Dec 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Steven Mark Williams, D.M.D. located?
The NPPES record lists a practice address at 999 E Stanley Blvd, Livermore, CA, 94550. Phone: (925) 371-0300. Providers update this record themselves, so call before visiting.
How can I verify Steven Mark Williams, D.M.D.'s license?
NPPES lists California license number 39912, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Steven Mark Williams, D.M.D. prescribe under Medicare Part D?
In 2024, Steven Mark Williams, D.M.D. had 190 Medicare Part D claims for 84 beneficiaries; the average among endodontics prescribers was 121. 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.