An Viet Nguyen, MD
Endocrinology, Diabetes & Metabolism Physician · Duarte, CA
An Viet Nguyen, MD is an endocrinology, diabetes & metabolism physician with a practice address in Duarte, California, and NPI 1619439833, issued on Apr 5, 2019. Check the license (California A176077, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- An Viet Nguyen
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- A176077 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 Duarte RD, Duarte, CA 91010
- Phone
- (800) 826-4673
- Enumerated
- Apr 5, 2019
- Record last updated
- Sep 23, 2024
- Medicare enrollment
- Enrolled (PECOS I20240830001555); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 1500 Duarte RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify An Viet Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A176077Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
354 Medicare Part D claims for 132 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Levothyroxine Sodium50 claims
- Mounjaro33 claims
- Atorvastatin Calcium30 claims
- Ozempic19 claims
- Hydrocortisone14 claims
- Metformin Hcl13 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.
Bills Medicare through one group practice
- City OF Hope Medical FoundationDuarte, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
An Viet Nguyen among 1,131 endocrinology, diabetes & metabolism physician records in California
An Viet Nguyen, MD is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 94% of them.
- NPI issued2019 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2019 · median 2003 among the 779 with a school on file
- Record last updated2024 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Duarte → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Trevor Angell, MDDuarte, CA 910101902106503
- Maria Chang Villacreses, MDDuarte, CA 910101740675610
- Ken Chiu, MDDuarte, CA 910101639126691
- Ana Emiliano, M.D.Duarte, CA 910101255548616
- Sasan Fazeli, M.D.Duarte, CA 910101003235540
- Elena Forouhar, MDDuarte, CA 910101467615807
- Fouad Kandeel, MDDuarte, CA 910101992761571
- Behrouz Salehian, M.D.Duarte, CA 910101659488930
Common questions
What is An Viet Nguyen, MD's NPI number?
An Viet Nguyen, MD's National Provider Identifier (NPI) is 1619439833, issued on Apr 5, 2019. An NPI identifies a provider in billing; it is not a license.
Where is An Viet Nguyen, MD located?
The NPPES record lists a practice address at 1500 Duarte RD, Duarte, CA, 91010. Phone: (800) 826-4673. Providers update this record themselves, so call before visiting.
How can I verify An Viet Nguyen, MD's license?
NPPES lists California license number A176077, 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 An Viet Nguyen, MD prescribe under Medicare Part D?
In 2024, An Viet Nguyen, MD had 354 Medicare Part D claims for 132 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
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.