Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. John Williamson, MD

Individual provider Pain Medicine Physician · NPI 1922069186

Dr. John Williamson, MD is a Pain Management in Huntsville, Texas. Qualified in 1991, 35 years ago. Practices with Stephen M Sims MD PA, a 5-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
35
Licensed in
TX
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

133 Medical Park Ln Ste B
Huntsville, TX 77340-4979
Phone: (936) 730-8833
Fax: (936) 730-8866
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1901 Medi Park, Amarillo, TX 79106-2110 — (806) 353-4699
  • 1020 Riverwood Ct Ste 200, Conroe, TX 77304-2974 — (936) 756-3444

Specialties & licences

Pain Medicine Physician (primary) Taxonomy 208VP0000X · Licence J2414 (TX)

Record details

NPI number1922069186
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 29, 2006
Last updated in NPPESDecember 11, 2019
Certification dateDecember 11, 2019

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPAIN MANAGEMENT
Also practisesANESTHESIOLOGY
Medical schoolOTHER
Graduated 1991 (35 years in practice)
Group practice Stephen M Sims Md Pa — 5 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients183
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $301 15 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Stephen M Sims MD PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Huntsville