NPPES file of Aug 9, 2026

Mark Joseph Williamson, DDS

General Practice Dentistry · San Antonio, TX

Mark Joseph Williamson, DDS is a general practice dentistry with a practice address in San Antonio, Texas, and NPI 1851844260, issued on Aug 2, 2016. Check the license (Texas 32216, as entered in NPPES) with the Texas board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1851844260
Name
Mark Joseph Williamson
Credential
DDS
Primary taxonomy
General Practice Dentistry 1223G0001X
License number
32216 TX
Self-reported in NPPES; status is on the state search
Practice location
3355 Cherry Ridge St Ste 216, San Antonio, TX 78230
Phone
(210) 341-2569
Enumerated
Aug 2, 2016
Record last updated
Apr 29, 2026
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 10,056 in Texas → Look up another NPI →

Verify Mark Joseph Williamson in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Texas board licenses this profession
    Search for license 32216    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
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23% more Medicare Part D claims than the average general practice dentistry in 2024

102 Medicare Part D claims for 60 beneficiaries, against an average of 83 among the 70,290 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 20 claims were for opioids.

  1. Mark Williamson102
  2. Specialty average83

Most prescribed

  1. Amoxicillin42 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.

Mark Joseph Williamson among 10,056 general practice dentistry records in Texas

Mark Joseph Williamson, DDS is one of 10,056 general practice dentistry records with a practice address in Texas. 64% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 72% of them.

  • NPI issued2016 · 72% of these records are older, 26% newer
  • In a Medicare fileYes · 64% of these records are
  • In the CMS Doctors and Clinicians fileNo · under 1% of these records are
  • Record last updated2026 · 71% 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 Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

752 general practice dentistry records list a practice address in San Antonio

They are 752 of the 37,749 NPPES records with a practice address in San Antonio, and 10,056 general practice dentistry records in Texas.

All 10,056 in Texas → Every provider in San Antonio → General Practice Dentistry nationwide →

The 8 general practice dentistry records with the nearest ZIP codes

  1. Rafael Aranda, D.D.SSan Antonio, TX 782301316091234
  2. Michael Duggan, DDSSan Antonio, TX 782301811932114
  3. David Garretson, D.D.S.San Antonio, TX 782301093893349
  4. Kevin Klenke, D.D.S.San Antonio, TX 782301013015320
  5. Alan Layton, DDSSan Antonio, TX 782301376629543
  6. Richard Lazor, DDSSan Antonio, TX 782301801909429
  7. Richard Longoria, DDSSan Antonio, TX 782301811088164
  8. Jeffrey Nanos, DDSSan Antonio, TX 782301992885172

Common questions

What is Mark Joseph Williamson, DDS's NPI number?

Mark Joseph Williamson, DDS's National Provider Identifier (NPI) is 1851844260, issued on Aug 2, 2016. An NPI identifies a provider in billing; it is not a license.

Where is Mark Joseph Williamson, DDS located?

The NPPES record lists a practice address at 3355 Cherry Ridge St Ste 216, San Antonio, TX, 78230. Phone: (210) 341-2569. Providers update this record themselves, so call before visiting.

How can I verify Mark Joseph Williamson, DDS's license?

NPPES lists Texas license number 32216, as entered by the provider. Search the Texas board that licenses this profession; the NPPES record confirms identity only.

How much does Mark Joseph Williamson, DDS prescribe under Medicare Part D?

In 2024, Mark Joseph Williamson, DDS had 102 Medicare Part D claims for 60 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.

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.