Dennis T. Nguyen, MD

Medicare activity in 2024

Official CMS public-use data for Dennis T. Nguyen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)156 services
2. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)114 services
3. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)88 services
4. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)74 services
5. Diagnostic exam of large bowel using a flexible endoscope (45378)71 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High cholesterol75%
• High blood pressure66%
• Arthritis46%
• Diabetes25%
• Ischemic heart disease24%
• Chronic kidney disease24%

Hospitals where Dennis T. Nguyen works

Medicare's Facility Affiliation Data lists Dennis T. Nguyen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Inova Fairfax HospitalFalls Church, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490063

Practice locations

Addresses where Dennis T. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).

• 5510 Alma LnSpringfield, VA 22151 (703) 642‑5990

Group practices

Medicare enrollment lists Dennis T. Nguyen as a member of this group (CMS data updated October 2, 2026).

• Virginia Medical Alliance, P.C.14 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in Virginia →

Other gastroenterologists in Virginia

Clinicians with the same Medicare primary specialty in Virginia — not a recommendation.

• Walter W. Immel
• Glen M. Arluk, MD
• Kiran Motwani
• Ashutosh S. Naniwadekar, MD
• Michael R. Konikoff, MD
• Sasha K. Mangray, MD
• Nicholas M. Szary, MD
• Anisha Thadani, MD

All gastroenterologists in Virginia →

Other clinicians in Virginia Medical Alliance, P.C.

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Walter W. Immel
• Hilary R. Schmidt, PA
• Seema Sharma, MD
• Hannan Moallin, PA
• Marc Eller, MD
• Feven Eyob, PA

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians