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

John Ross Williams, MD

Individual provider Neurological Surgery Physician · NPI 1336536200

John Ross Williams, MD practises Neurosurgery in Houston, Texas. Qualified in 2015, 11 years ago. Practices with UT Physicians, a 203-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Maryland.

Years since qualifying
11
Licensed in
MD
In the registry since
2015
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

6400 Fannin St Ste 2150
Houston, TX 77030-1524
Phone: (713) 486-8000
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 600 N Wolfe Street, Baltimore, MD 21287-2128 — (410) 955-4424
  • 325 9th Ave Dept Of, Seattle, WA 98104-2420 — (206) 744-9389

Specialties & licences

Neurological Surgery Physician (primary) Taxonomy 207T00000X · Licence D94083 (MD)

Record details

NPI number1336536200
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 18, 2015
Last updated in NPPESJune 8, 2023
Certification dateJune 8, 2023

Medicare enrollment

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

Medicare specialtyNEUROSURGERY
Medical schoolOTHER
Graduated 2015 (11 years in practice)
Group practice Ut Physicians — 203 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Spinal fusion 64 times · 62nd percentile
Laminectomy or laminotomy (partial removal of spine bones) 30 times · 60th percentile
Removal of tissue 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients82
Services billed 176 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

Travel and Lodging $774 3 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $438 8 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 UT Physicians

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 203 clinicians in the practice; 12 are shown here.

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