Andrew Nguyen, MD
NPI 1154784783 · Gastroenterology Physician · Downey, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Nguyen, MD is a Gastroenterology Physician provider in Downey, CA (NPI 1154784783).
Provider details
- NPI number
- 1154784783
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 11265647-1205 (UT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
10 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
160 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 41 | $96 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 31 | $134 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 30 | $121 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 27 | $132 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 18 | $172 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 179 | 173 |
| Omeprazole | 73 | 31 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 45 | 43 |
| Ursodiol | 20 | — |
| Linaclotidebrand: Linzess | 18 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 17 | 14 |
| Lipase/Protease/Amylase |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$211 across 8 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
Additional practice locations (2)
- 26520 Cactus AveMoreno Valley, CA 92555-3927Phone: (714) 902-5641
- 30 N 1900 E Rm 4r118Salt Lake City, UT 84132-0002Phone: (801) 581-7803
Registry dates
- Enumerated
- 2016-03-31
- Last updated
- 2022-08-12
- Certified
- 2022-08-12
Frequently asked questions
- What is Andrew Nguyen's NPI number?
- Andrew Nguyen's National Provider Identifier (NPI) is 1154784783, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Nguyen's specialty?
- Andrew Nguyen is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Nguyen located?
- Andrew Nguyen's practice location on file with NPPES is 11500 Brookshire Ave, Downey, CA 90241-4917.
- What is Andrew Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Andrew Nguyen is (714) 902-5641.
- Does Andrew Nguyen accept Medicare?
- Andrew Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Nguyen's NPI active?
- Yes — Andrew Nguyen's NPI (1154784783) is active in the NPPES registry as of the last update on 2022-08-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.