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

James Parker Gregg, MD

Individual provider Diagnostic Radiology Physician · NPI 1518100049

James Parker Gregg, MD practises Diagnostic Radiology in Houston, Texas. Graduated from University of Texas Medical Branch at Galveston in 2002, 24 years ago. Practices with Singleton Associates PA, a 795-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
24
Trained at
University of Texas Medical Branch at Galveston
Licensed in
TX
In the registry since
2009
Specialties on file
2
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

7026 Old Katy Rd Ste 276
Houston, TX 77024-2187
Phone: (713) 621-7436
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1 Baylor Plz # Ms 360, Houston, TX 77030-3411 — (713) 798-6187

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence N5694 (TX)
Vascular & Interventional Radiology Physician Taxonomy 2085R0204X · Licence N5694 (TX)

Record details

NPI number1518100049
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 14, 2009
Last updated in NPPESApril 6, 2018

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON
Graduated 2002 (24 years in practice)
Group practice Singleton Associates Pa — 795 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations30 on file with Medicare

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 patients2,578
Services billed 3,523 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.

Food and Beverage $1,511 9 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.

  • Memorial Hermann - Texas Medical Center Hospital · Houston, TX · listed as Memorial Hermann Surgery Center Texas Medical Center, LLP
  • Memorial Hermann Hospital System Hospital · Houston, TX · listed as Memorial Hermann Health System
  • Hca Houston Healthcare Conroe Hospital · Conroe, TX
  • Hca Houston Healthcare Kingwood Hospital · Kingwood, TX
  • Memorial Hermann Katy Hospital Hospital · Katy, TX

Colleagues at Singleton Associates PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 795 clinicians in the practice; 12 are shown here.

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