Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

James Whittenburg Walker Jr., MD

Individual provider Internal Medicine Physician · NPI 1144205568

James Whittenburg Walker Jr., MD practises Internal Medicine in Amarillo, Texas. Graduated from University of Texas Southwestern Medical School at Dallas in 1990, 36 years ago. Practices with Texas Tech University Health Sciences Center Amarillo, a 74-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
36
Trained at
University of Texas Southwestern Medical School at Dallas
Licensed in
TX
In the registry since
2005
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

1400 S Coulter St
Amarillo, TX 79106-1786
Phone: (806) 414-9100
Fax: (806) 354-5717
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence H9584 (TX)

Record details

NPI number1144205568
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 8, 2005
Last updated in NPPESJune 2, 2025
Certification dateJune 2, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL SCHOOL AT DALLAS
Graduated 1990 (36 years in practice)
Group practice Texas Tech University Health Sciences Center Amarillo — 74 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 patients210
Services billed 534 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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 $22 1 payment · 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.

  • Bsa Hospital Hospital · Amarillo, TX · listed as Bsa Hospital LLC
  • Northwest Texas Hospital Hospital · Amarillo, TX
  • Enhabit Hospice Hospice · Amarillo, TX

Colleagues at Texas Tech University Health Sciences Center Amarillo

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 74 clinicians in the practice; 12 are shown here.

Other providers in Amarillo