NPPES file of Aug 9, 2026

Mai Tuyet Duong, M.D.

Internal Medicine Physician · El Cajon, CA

Mai Tuyet Duong, M.D. is an internal medicine physician with a practice address in El Cajon, California, and NPI 1629339304, issued on May 30, 2012. Check the license (California A127798, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1629339304
Name
Mai Tuyet Duong
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
A127798 CA
Self-reported in NPPES; status is on the state search
Practice location
525 E Main St, El Cajon, CA 92020
Phone
(619) 515-2498
Enumerated
May 30, 2012
Record last updated
May 10, 2023
Medicare enrollment
Enrolled (PECOS I20160310001538); accepts Medicare assignment
Medical or professional school
University Of California, San Diego School Of Medicine, 2012
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 525 E Main St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Amethyst Aguero, DOInternal Medicine Physician1568021913
  2. Mohamed Baiou, M.D.Family Medicine Physician1447542659
  3. Brittney Blais, NP-CFamily Nurse Practitioner1952852808
  4. Tara Fleming, MDPediatrics Physician1972965242
  5. Magan Freitag, D.O.Family Medicine Physician1811378557
  6. Dixie Galapon, PH.D.Psychologist1174646301

Verify Mai Tuyet Duong in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A127798    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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13% fewer Medicare Part D claims than the average internal medicine physician in 2024

2,778 Medicare Part D claims for 98 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.

  1. Mai Duong2,778
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium272 claims
  2. Amlodipine Besylate168 claims
  3. Lisinopril113 claims
  4. Famotidine102 claims
  5. Jardiance98 claims
  6. Gabapentin93 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

  1. Family Health Centers OF San Diego IncEl Cajon, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

26 internal medicine physician records list a practice address in El Cajon

They are 26 of the 3,277 NPPES records with a practice address in El Cajon, and 17,696 internal medicine physician records in California.

All 26 in El Cajon → All 17,696 in California → Every provider in El Cajon →

Other internal medicine physician records in California

  1. Jacob Aaron, MDSan Francisco, CA1407202518
  2. Alistair Aaronson, MDStanford, CA1457628760
  3. Jose Abad., MDSacramento, CA1144607219
  4. Donna Abare, MDOakland, CA1386722155
  5. Marce AbareScotts Valley, CA1457744708
  6. Samuel Abarte, M.D.Chula Vista, CA1578535498
  7. Alexander Abary, MDLong Beach, CA1104995919
  8. Luba Abascal, MDSan Francisco, CA1023180874
  9. Michael Abate, MDSacramento, CA1548248131
  10. Wali Abawi, D.O.Joshua Tree, CA1104362268

Common questions

What is Mai Tuyet Duong, M.D.'s NPI number?

Mai Tuyet Duong, M.D.'s National Provider Identifier (NPI) is 1629339304, issued on May 30, 2012. An NPI identifies a provider in billing; it is not a license.

Where is Mai Tuyet Duong, M.D. located?

The NPPES record lists a practice address at 525 E Main St, El Cajon, CA, 92020. Phone: (619) 515-2498. Providers update this record themselves, so call before visiting.

How can I verify Mai Tuyet Duong, M.D.'s license?

NPPES lists California license number A127798, 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 Mai Tuyet Duong, M.D. prescribe under Medicare Part D?

In 2024, Mai Tuyet Duong, M.D. had 2,778 Medicare Part D claims for 98 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.