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

Abraham Winkelstein

Individual provider Gastroenterology Physician · NPI 1548260920

Abraham Winkelstein practises Gastroenterology in Shenandoah, Texas. Graduated from Georgetown University School of Medicine in 1991, 35 years ago. Practices with Digestive Specialists of North Harris County PA, a 6-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
35
Trained at
Georgetown University School of Medicine
Licensed in
TX
In the registry since
2005
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Practice location Address checks out

111 Vision Park Blvd Ste 150
Shenandoah, TX 77384-3002 Not confirmed with CMS for 18 years — call before visiting
Phone: (936) 321-0033
Fax: (936) 321-0032
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence K4297 (TX)

Record details

NPI number1548260920
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedJuly 27, 2005
Last updated in NPPESMay 20, 2008

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolGEORGETOWN UNIVERSITY SCHOOL OF MEDICINE
Graduated 1991 (35 years in practice)
Group practice Digestive Specialists Of North Harris County Pa — 6 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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.

Colonoscopy 101 times · 80th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 88 times · 74th percentile

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 patients593
Services billed 1,135 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 $21 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.

  • Houston Methodist Willowbrook Hospital Hospital · Houston, TX
  • Memorial Hermann Hospital System Hospital · Houston, TX · listed as Memorial Hermann Health System
  • Houston Methodist The Woodlands Hospital Hospital · The Woodlands, TX
  • Memorial Hermann Northeast Hospital Hospital · Humble, TX
  • St Luke'S The Woodlands Hospital Hospital · The Woodlands, TX

Colleagues at Digestive Specialists of North Harris County PA

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

Other providers in Shenandoah