Dennis Nguyen, MD
NPI 1811121213 · Hospitalist Physician · Springfield, VA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dennis Nguyen, MD is a Hospitalist Physician provider in Springfield, VA (NPI 1811121213).
Provider details
- NPI number
- 1811121213
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD040718 (DC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
646 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 156 | $144 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 114 | $126 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 88 | $352 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 74 | $523 |
| Diagnostic Exam of Large Bowel Using a Flexible Endoscope45378 | 71 | $357 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 175 | 79 |
| Sod Picosulf/Mag Ox/Citric Acbrand: Clenpiq | 121 | 120 |
| Omeprazole | 68 | 25 |
| Sod Sulf/Pot Chloride/Mag Sulfbrand: Sutab | 53 | 53 |
| Famotidine | 51 | 21 |
| Esomeprazole Magnesium | 42 | 14 |
| Dicyclomine Hcl | 32 | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,365 across 71 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-05-13
- Last updated
- 2016-06-30
Frequently asked questions
- What is Dennis Nguyen's NPI number?
- Dennis Nguyen's National Provider Identifier (NPI) is 1811121213, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dennis Nguyen's specialty?
- Dennis Nguyen is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis Nguyen located?
- Dennis Nguyen's practice location on file with NPPES is 5510 Alma Ln, Springfield, VA 22151-4027.
- What is Dennis Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Dennis Nguyen is (703) 642-5990.
- Does Dennis Nguyen accept Medicare?
- Dennis Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dennis Nguyen's NPI active?
- Yes — Dennis Nguyen's NPI (1811121213) is active in the NPPES registry as of the last update on 2016-06-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.