Andrew Khoi Nguyen, MD
Gastroenterology Physician · Downey, CA
Andrew Khoi Nguyen, MD is a gastroenterology physician with a practice address in Downey, California, and NPI 1154784783, issued on Mar 31, 2016. Check the license (California 151128, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrew Khoi Nguyen
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 151128 CA
11265647-1205 UT
Self-reported in NPPES; status is on the state search - Practice location
- 11500 Brookshire Ave, Downey, CA 90241
- Phone
- (714) 902-5641
- Enumerated
- Mar 31, 2016
- Record last updated
- Aug 12, 2022
- Medicare enrollment
- Enrolled (PECOS I20221019001793); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 2016
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 11500 Brookshire Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ava Azimi, M.D.Internal Medicine Physician1023252483
- Cristionne Barbarin, LCSWClinical Social Worker1942685342
- Ivan Barrett, M.D.Diagnostic Radiology Physician1073571113
- Tyana Besada, MSN, RN, CNS, CCRNClinical Nurse Specialist1932056231
- Payal Bhowmick, PHARMDPharmacotherapy Pharmacist1518783661
- Alexis BoltonFamily Nurse Practitioner1215546197
Verify Andrew Khoi Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 151128Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average gastroenterology physician in 2024
470 Medicare Part D claims for 295 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf179 claims
- Omeprazole73 claims
- Gavilyte-G45 claims
- Ursodiol20 claims
- Linzess18 claims
- Peg-3350 And Electrolytes17 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $210.89
8 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Pih Health PhysiciansDowney, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrew Khoi Nguyen among 2,140 gastroenterology physician records in California
Andrew Khoi Nguyen, MD is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 88% of them.
- NPI issued2016 · 88% of these records are older, 9% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2016 · median 2002 among the 1,538 with a school on file
- Record last updated2022 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Downey → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Gaurang Chaurushia, MDDowney, CA 902411538126131
- Kevin Dholaria, M.D.Downey, CA 902411629343736
- Ann Lee, M.D.Downey, CA 902411396979126
- Sushil Ojha, MDDowney, CA 902411053377093
- Rajeev Attam, MDDowney, CA 902421184694309
- Terence Chiu, MDDowney, CA 902421427083229
- Gareth Dulai, MDDowney, CA 902421164457883
- Paul Frenkiel, M.D.Downey, CA 902401245284645
Common questions
What is Andrew Khoi Nguyen, MD's NPI number?
Andrew Khoi Nguyen, MD's National Provider Identifier (NPI) is 1154784783, issued on Mar 31, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Andrew Khoi Nguyen, MD located?
The NPPES record lists a practice address at 11500 Brookshire Ave, Downey, CA, 90241. Phone: (714) 902-5641. Providers update this record themselves, so call before visiting.
How can I verify Andrew Khoi Nguyen, MD's license?
NPPES lists California license number 151128, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrew Khoi Nguyen, MD prescribe under Medicare Part D?
In 2024, Andrew Khoi Nguyen, MD had 470 Medicare Part D claims for 295 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Andrew Khoi Nguyen, MD's MIPS final score?
The 2023 MIPS final score is 76.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.