Stephen Nguyen, MD
NPI 1912022443 · Specialist · Fremont, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Nguyen, MD is a Specialist provider in Fremont, CA (NPI 1912022443).
Provider details
- NPI number
- 1912022443
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A90482 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 300 | 295 |
| Pantoprazole Sodium | 61 | 25 |
| Esomeprazole Magnesium | 56 | 19 |
| Mesalamine | 32 | 12 |
| Omeprazole | 31 | 17 |
| Cholestyramine (with Sugar)brand: Cholestyramine | 24 | — |
| Rifaximinbrand: Xifaxan | 24 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-21
- Last updated
- 2022-02-11
Frequently asked questions
- What is Stephen Nguyen's NPI number?
- Stephen Nguyen's National Provider Identifier (NPI) is 1912022443, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Nguyen's specialty?
- Stephen Nguyen is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Stephen Nguyen located?
- Stephen Nguyen's practice location on file with NPPES is 42881 Fremont Blvd, Fremont, CA 94538-4145.
- What is Stephen Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Stephen Nguyen is (415) 353-8693.
- Does Stephen Nguyen accept Medicare?
- Stephen Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Nguyen's NPI active?
- Yes — Stephen Nguyen's NPI (1912022443) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.